Android: การใช้งาน ListView แบบ Multiple Choice

ที่หน้า MainActivity มีตัวเลือกให้เลือก (simple_list_item_multiple_choice)
เมือเลือกเสร็จแล้วกดปุ่ม จะเรียกหน้า ResultActivity
หน้า ResultActivity แสดงรายการที่ผู้ใช้เลือก (simple_list_item_1)

เพิ่ม Activity ชื่อ ResultActivity แบบ EmptyActivity

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <Button
            android:id="@+id/button1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Submit" />

        <ListView
            android:id="@+id/listView1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:padding="5dp" />

    </LinearLayout>

</android.support.constraint.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

<Button

android:id="@+id/button1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="Submit" />

<ListView

android:id="@+id/listView1"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:padding="5dp" />

</LinearLayout>

</android.support.constraint.ConstraintLayout>

MainActivity.java

package com.phaisarn.jackapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.SparseBooleanArray;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    ArrayAdapter<String> arrayAdapter;

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

        ArrayList arrayList = new ArrayList();
        arrayList.add("Trace 1");
        arrayList.add("Trace 2");
        arrayList.add("Trace 3");
        arrayList.add("Trace 4");
        arrayList.add("Trace 5");

        // Get reference of widgets from XML layout
        final ListView listView1 = (ListView) findViewById(R.id.listView1);

        // Create a List from String Array elements
        final List<String> fruits_list = new ArrayList<String>(arrayList);

        // Create an ArrayAdapter from List
        arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, fruits_list);

        listView1.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        // DataBind ListView with items from ArrayAdapter
        listView1.setAdapter(arrayAdapter);

        listView1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String selectedItem = parent.getItemAtPosition(position).toString();
                Toast.makeText(getApplicationContext(), selectedItem, Toast.LENGTH_SHORT).show();
            }
        });

        Button button1 = findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Toast.makeText(getApplicationContext(), "HelloWorld", Toast.LENGTH_SHORT).show();
                SparseBooleanArray checked = listView1.getCheckedItemPositions();
                ArrayList<String> selectedItems = new ArrayList<String>();
                for (int i = 0; i < checked.size(); i++) {
                    // Item position in adapter
                    int position = checked.keyAt(i);
                    // Add sport if it is checked i.e.) == TRUE!
                    if (checked.valueAt(i))
                        selectedItems.add(arrayAdapter.getItem(position));
                }

                String[] outputStrArr = new String[selectedItems.size()];

                for (int i = 0; i < selectedItems.size(); i++) {
                    outputStrArr[i] = selectedItems.get(i);
                }

                Intent intent = new Intent(getApplicationContext(), ResultActivity.class);

                // Create a bundle object
                Bundle bundle = new Bundle();
                bundle.putStringArray("selectedItems", outputStrArr);

                // Add the bundle to the intent.
                intent.putExtras(bundle);

                // start the ResultActivity
                startActivity(intent);
            }
        });
    }
}

package com.phaisarn.jackapplication;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.SparseBooleanArray;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.ListView;

import android.widget.Toast;

import java.util.ArrayList;

import java.util.List;

public class MainActivity extends AppCompatActivity {

ArrayAdapter<String> arrayAdapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

ArrayList arrayList = new ArrayList();

arrayList.add("Trace 1");

arrayList.add("Trace 2");

arrayList.add("Trace 3");

arrayList.add("Trace 4");

arrayList.add("Trace 5");

// Get reference of widgets from XML layout

final ListView listView1 = (ListView) findViewById(R.id.listView1);

// Create a List from String Array elements

final List<String> fruits_list = new ArrayList<String>(arrayList);

// Create an ArrayAdapter from List

arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, fruits_list);

listView1.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

// DataBind ListView with items from ArrayAdapter

listView1.setAdapter(arrayAdapter);

listView1.setOnItemClickListener(new AdapterView.OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

String selectedItem = parent.getItemAtPosition(position).toString();

Toast.makeText(getApplicationContext(), selectedItem, Toast.LENGTH_SHORT).show();

}

});

Button button1 = findViewById(R.id.button1);

button1.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

//Toast.makeText(getApplicationContext(), "HelloWorld", Toast.LENGTH_SHORT).show();

SparseBooleanArray checked = listView1.getCheckedItemPositions();

ArrayList<String> selectedItems = new ArrayList<String>();

for (int i = 0; i < checked.size(); i++) {

// Item position in adapter

int position = checked.keyAt(i);

// Add sport if it is checked i.e.) == TRUE!

if (checked.valueAt(i))

selectedItems.add(arrayAdapter.getItem(position));

}

String[] outputStrArr = new String[selectedItems.size()];

for (int i = 0; i < selectedItems.size(); i++) {

outputStrArr[i] = selectedItems.get(i);

}

Intent intent = new Intent(getApplicationContext(), ResultActivity.class);

// Create a bundle object

Bundle bundle = new Bundle();

bundle.putStringArray("selectedItems", outputStrArr);

// Add the bundle to the intent.

intent.putExtras(bundle);

// start the ResultActivity

startActivity(intent);

}

});

}

activity_result.xml

<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/outputList"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

<?xml version="1.0" encoding="utf-8"?>

<ListView xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/outputList"

android:layout_width="fill_parent"

android:layout_height="fill_parent" />

ResultActivity.java

package com.phaisarn.jackapplication;

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

public class ResultActivity extends AppCompatActivity {

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


        Bundle b = getIntent().getExtras();
        String[] resultArr = b.getStringArray("selectedItems");
        ListView listView = findViewById(R.id.outputList);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, resultArr);
        listView .setAdapter(adapter);
    }
}

package com.phaisarn.jackapplication;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.ArrayAdapter;

import android.widget.ListView;

public class ResultActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_result);

Bundle b = getIntent().getExtras();

String[] resultArr = b.getStringArray("selectedItems");

ListView listView = findViewById(R.id.outputList);

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,

android.R.layout.simple_list_item_1, resultArr);

listView .setAdapter(adapter);

}

Link

ANDROID: MULTIPLE SELECTION LISTVIEW

Phaisarn Sutheebanjard

blog.phaisarn.com

Android: การใช้งาน ListView แบบ Multiple Choice