Windows – Alt Key Numeric Codes

การใช้งาน กด Alt พร้อมด้วยรหัสแอสกีในเลขฐาน 10 แบบสี่หลัก เช่น A ก็ Alt 0065
(รึไม่ก็ใช้ Character Map เลย)

Currency Symbols

Windows Alt Code for Currency Symbols

Fractions

These codes produce fractions which are spaced on one line.

Windows Alt Codes – Fractions

Other Punctuation

These incude copyright symbols and special section marks.

Windows Alt Codes for Punctuation

tlt.psu.edu – Windows – Alt Key Numeric Codes
tlt.psu.edu – Character Map Utility

www.alt-codes.net/check-mark-symbols.php

Auto-complete Suggestions

activity_main.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.MainActivity">

<AutoCompleteTextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/autocomplete_country"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
[/code]

strings.xml

[code lang=”xml”]
<resources>
<string name="app_name">Jack Application</string>

<string-array name="countries_array">
<item>Afghanistan</item>
<item>Albania</item>
<item>Algeria</item>
<item>American Samoa</item>
<item>Andorra</item>
<item>Angola</item>
<item>Anguilla</item>
<item>Antarctica</item>
</string-array>
</resources>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// Get a reference to the AutoCompleteTextView in the layout
AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.autocomplete_country);
// Get the string array
String[] countries = getResources().getStringArray(R.array.countries_array);
// Create the adapter and set it to the AutoCompleteTextView
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, countries);
textView.setAdapter(adapter);
}
}
[/code]

Provide Auto-complete Suggestions

การแจ้งเตือน (Notification)

การแจ้งเตือน

มีปุ่ม 3 ปุ่ม

  • ปุ่มที่ 1 Notify เป็นการแจ้งเตือน
  • ปุ่มที่ 2 Update เป็นการอัพเดทข้อความแจ้งเตือน
  • ปุ่มที่ 3 Cancel เป็นการยกเลิกการแจ้งเตือน

เมื่อผู้ใช้กดที่การแจ้งเตือน จะมีการเรียกหน้า Activity
ที่เราเตรียมไว้ให้แสดงขึ้นมา (หน้า NotificationActivity)

Continue reading

AlertDialog

Dialog1

ไดอะล็อก Yes/No

activity_main.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.MainActivity">

<Button
android:id="@+id/my_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click" />
</LinearLayout>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton = (Button) findViewById(R.id.my_button);
myButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("This is dialog 1.");
builder.setMessage("Are you OK?");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "OK", Toast.LENGTH_SHORT).show();
;
}
});
builder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "NO", Toast.LENGTH_SHORT).show();
}
});
builder.show();
}
});
}
}
[/code]

Dialog2

ไดอะล็อกตัวเลือกแบบ Single choice แบบที่ 1

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton = (Button) findViewById(R.id.my_button);
myButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final String[] items = {"2557", "2558", "2559", "2560"};
new AlertDialog.Builder(MainActivity.this)
.setTitle("This is dialog 2.")
.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, items[which], Toast.LENGTH_SHORT).show();
}
})
.show();
}
});
}
}
[/code]

Dialog3

ไดอะล็อกตัวเลือกแบบ Single choice แบบที่ 2

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton = (Button) findViewById(R.id.my_button);
myButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final String[] items = {"2557", "2558", "2559", "2560"};
new AlertDialog.Builder(MainActivity.this)
.setTitle("This is dialog 3.")
.setSingleChoiceItems(items, -1, null)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
ListView listView = ((AlertDialog) dialog).getListView();
int i = listView.getCheckedItemPosition();
if (i >= 0) {
Toast.makeText(MainActivity.this, items[i], Toast.LENGTH_SHORT).show();
}
}
})
.show();
}
});
}
}
[/code]

Dialog4

ไดอะล็อกตัวเลือกแบบ Multiple choice

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Collections;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

final ArrayList<Integer> resultList = new ArrayList<>();

Button myButton = (Button) findViewById(R.id.my_button);
myButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final String[] items = {"2557", "2558", "2559", "2560"};
boolean[] isSelected = new boolean[items.length];
for (int i : resultList)
isSelected[i] = true;

new AlertDialog.Builder(MainActivity.this)
.setTitle("This is dialog 4.")
.setMultiChoiceItems(items, isSelected, new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
if (isChecked)
resultList.add(which);
else if (resultList.contains(which))
resultList.remove(Integer.valueOf(which));
}
})
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String str = "";
Collections.sort(resultList);
for (int i : resultList) {
str += items[i];
if (i < resultList.size()-1)
str += "\n";
}
if (str.length() > 0)
Toast.makeText(MainActivity.this, str, Toast.LENGTH_SHORT).show();
}
})
.show();
}
});
}
}
[/code]

Dialog5

ไดอะล็อกปรับแต่งเอง

layout_login.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<EditText
android:id="@+id/username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="Username"
android:textAlignment="center" />

<EditText
android:id="@+id/password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="Password"
android:inputType="textPassword"
android:textAlignment="center" />
</LinearLayout>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Collections;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

final ArrayList<Integer> resultList = new ArrayList<>();

Button myButton = (Button) findViewById(R.id.my_button);
myButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
LayoutInflater layoutInflater = getLayoutInflater();
final AlertDialog builder = new AlertDialog.Builder(MainActivity.this)
.setTitle("This is dialog 5")
.setView(layoutInflater.inflate(R.layout.layout_login, null))
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.create();
builder.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
Button button = builder.getButton(builder.BUTTON_POSITIVE);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
EditText editText = (EditText) builder.findViewById(R.id.username);
String str = editText.getText().toString().trim();
if (str.length() > 0) {
Toast.makeText(MainActivity.this, str, Toast.LENGTH_SHORT).show();
}
builder.dismiss();
}
});
}
});
builder.show();
}
});
}
}
[/code]

Dialog6

ไดอะล็อกดาวน์โหลดข้อมูล

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.app.ProgressDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton = (Button) findViewById(R.id.my_button);
myButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String title = "Downloading data";
String msg = "Please wait…";
final ProgressDialog dialog = ProgressDialog.show(MainActivity.this, title, msg);

Thread thread = new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
dialog.dismiss();
}
});
thread.start();
}
});
}
}
[/code]

เรียก Activity อื่น

1.เรียกใช้งานแอคทิวิตี้อื่น

เพิ่มแอคทิวิตี้ชื่อ SecondActivity

activity_main.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.MainActivity">

<Button
android:id="@+id/my_button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click1" />
</LinearLayout>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton1 = (Button) findViewById(R.id.my_button1);
myButton1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
startActivity(intent);
}
});
}
}
[/code]

activity_second.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_second"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.SecondActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is second activity." />
</LinearLayout>
[/code]

2.เรียกใช้งานแอคทิวิตี้อื่นพร้อมส่งข้อมูลไปให้

activity_main.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.MainActivity">

<EditText
android:id="@+id/editText1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" />

<Button
android:id="@+id/my_button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click1" />
</LinearLayout>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

public static final String MESSAGE1 = "Message1";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton1 = (Button) findViewById(R.id.my_button1);
myButton1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
EditText editText = (EditText) findViewById(R.id.editText1);
String msg = editText.getText().toString();

Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
intent.putExtra(MESSAGE1, msg);
startActivity(intent);
}
});
}
}
[/code]

activity_second.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_second"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.SecondActivity">

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is second activity."/>
</LinearLayout>
[/code]

SecondActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class SecondActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);

Intent intent = getIntent();
String msg = intent.getStringExtra(MainActivity.MESSAGE1);

TextView textView = (TextView) findViewById(R.id.textView2);
textView.setText(msg);
}
}
[/code]

3.ส่งข้อมูลกลับมาให้แอคทิวิตี้ต้นทาง

activity_main.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.MainActivity">

<Button
android:id="@+id/my_button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click1" />
</LinearLayout>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

public static final String MESSAGE2 = "Message2";
public static final int CODE = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton1 = (Button) findViewById(R.id.my_button1);
myButton1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
startActivityForResult(intent, CODE);
}
});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == CODE) {
if (resultCode == RESULT_OK) {
String msg = intent.getStringExtra(MESSAGE2);
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}
}
}

}

[/code]

activity_second.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_second"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.SecondActivity">

<EditText
android:id="@+id/editText2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" />

<Button
android:id="@+id/my_button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Return" />
</LinearLayout>
[/code]

SecondActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class SecondActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);

Button myButton2 = (Button) findViewById(R.id.my_button2);
myButton2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
EditText editText = (EditText) findViewById(R.id.editText2);
String msg = editText.getText().toString();

Intent intent = new Intent();
intent.putExtra(MainActivity.MESSAGE2, msg);
setResult(RESULT_OK, intent);
finish();
}
});
}
}
[/code]

Event Handling

อีเวนต์ onClick

แบบที่ 1

ผูกอีเวนต์ไว้ที่หน้า Layout ด้วย android:onClick แล้วเขียนเมธอดไว้ที่หน้า Activity

activity_main.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.MainActivity">

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClick"
android:text="Click" />
</LinearLayout>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

public void onClick(View view) {
Toast.makeText(this, "Hello World#1", Toast.LENGTH_SHORT).show();
}
}
[/code]

แบบที่ 2

ผูกอีเวนต์ที่หน้า Activity ไว้กับปุ่มที่หน้า Layout โดยสร้าง Inner Class แบบ Anonymous (เหมาะกับการเรียกใช้แบบครั้งเดียว)

activity_main.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.MainActivity">

<Button
android:id="@+id/my_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click" />
</LinearLayout>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton = (Button) findViewById(R.id.my_button);
myButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(), "Hello World#2", Toast.LENGTH_SHORT).show();
}
});
}
}
[/code]

แบบที่ 3

ผูกอีเวนต์ที่หน้า Activity ไว้กับปุ่มที่หน้า Layout โดยสร้าง Inner Class ขึ้นมา (สามารถเรียกใช้ได้หลายครั้ง)

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton = (Button) findViewById(R.id.my_button);
myButton.setOnClickListener(new MyListener());
}

private class MyListener implements View.OnClickListener{

@Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(), "Hello World#3", Toast.LENGTH_SHORT).show();
}
}
}
[/code]

แบบที่ 4

ผูกอีเวนต์ที่หน้า Activity ไว้กับปุ่มที่หน้า Layout โดย Implement อินเทอร์เฟส View.OnClickListener ไว้ที่ Class หลักเลย

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton = (Button) findViewById(R.id.my_button);
myButton.setOnClickListener(this);
}

@Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(), "Hello World#4", Toast.LENGTH_SHORT).show();
}
}
[/code]

แต่ในกรณีที่มีหลายปุ่ม ให้ตรวจสอบว่าอีเวนต์นี้ถูกเรียกมาจากปุ่มไหนด้วย view.getId()

activity_main.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.MainActivity">

<Button
android:id="@+id/my_button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click1" />

<Button
android:id="@+id/my_button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click2" />
</LinearLayout>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button myButton1 = (Button) findViewById(R.id.my_button1);
myButton1.setOnClickListener(this);

Button myButton2 = (Button) findViewById(R.id.my_button2);
myButton2.setOnClickListener(this);
}

@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.my_button1:
Toast.makeText(getApplicationContext(), "Button#1", Toast.LENGTH_SHORT).show();
break;
case R.id.my_button2:
Toast.makeText(getApplicationContext(), "Button#2", Toast.LENGTH_SHORT).show();
break;
}
}
}
[/code]

Popup Menu

ป๊อบอัพเมนู

activity_main.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.MainActivity">

<Button
android:id="@+id/buttonShowPopup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="showMenu"
android:text="Popup" />

</RelativeLayout>
[/code]

menu_popup.xml

[code lang=”xml”]
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.phaisarn.testapplication.MainActivity">

<item
android:id="@+id/popup_menu1"
android:orderInCategory="101"
android:title="@string/popup_menu1"
app:showAsAction="never" />

<item
android:id="@+id/popup_menu2"
android:orderInCategory="101"
android:title="@string/popup_menu2"
app:showAsAction="never" />

</menu>
[/code]

strings.xml

[code lang=”xml”]
<resources>
<string name="app_name">Jack Application</string>

<string name="popup_menu1">Popup Menu1</string>
<string name="popup_menu2">Popup Menu2</string>
</resources>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.PopupMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

public void showMenu(View v) {
PopupMenu popup = new PopupMenu(this, v);
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.popup_menu1:
Toast.makeText(getApplicationContext(), "Popup1", Toast.LENGTH_SHORT).show();
return true;
case R.id.popup_menu2:
Toast.makeText(getApplicationContext(), "Popup2", Toast.LENGTH_SHORT).show();
return true;
default:
return false;
}
}
});
popup.inflate(R.menu.menu_popup);
popup.show();
}
}
[/code]

ส่งอีเมล์

ปุ่มส่งอีเมล์

activity_main.xml

[code lang=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.phaisarn.jackapplication.MainActivity">

<Button
android:id="@+id/buttonSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send" />

</RelativeLayout>
[/code]

MainActivity.java

[code lang=”java”]
package com.phaisarn.jackapplication;

import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.File;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button buttonSend = (Button) findViewById(R.id.buttonSend);
buttonSend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_EMAIL, new String[]{"email@example.com"});
intent.putExtra(Intent.EXTRA_SUBJECT, "subject here");
intent.putExtra(Intent.EXTRA_TEXT, "body text");
//File root = Environment.getExternalStorageDirectory();
//File file = new File(root, Filename);
//if (!file.exists() || !file.canRead()) {
// Toast.makeText(getApplicationContext(), "Attachment Error", Toast.LENGTH_SHORT).show();
// finish();
// return;
//}
//Uri uri = Uri.parse("file://" + file.getAbsolutePath());
//intent.putExtra(Intent.EXTRA_STREAM, uri);
startActivity(Intent.createChooser(intent, "Send email…"));
}
});
}
}
[/code]