build.gradle (Module: app)
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apply plugin: 'com.android.application' android { compileSdkVersion 28 defaultConfig { applicationId "com.phaisarn.myapplication" minSdkVersion 21 targetSdkVersion 28 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'com.android.support:appcompat-v7:28.0.0-rc02' implementation 'com.android.support.constraint:constraint-layout:1.1.3' implementation 'com.android.support:design:28.0.0-rc02' testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.2' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' implementation 'com.github.rubensousa:gravitysnaphelper:1.0' } |
drawable/item_border.xml
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<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <stroke android:width="1dp" android:color="#aaa" /> <corners android:radius="0dp" /> <solid android:color="#fff" /> </shape> |
layout/custom_layout.xml
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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="130dp" android:layout_height="wrap_content" android:layout_margin="8dp" android:background="@drawable/item_border" android:orientation="vertical" android:padding="8dp"> <ImageView android:id="@+id/image_top" android:layout_width="match_parent" android:layout_height="80dp" android:layout_marginBottom="5dp" android:scaleType="centerCrop" android:src="@mipmap/ic_launcher" /> <GridLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:columnCount="2"> <TextView android:id="@+id/text_title" android:layout_columnWeight="1" android:lines="2" android:maxLines="2" android:text="Marshmallow" android:textSize="16sp" /> <ImageView android:id="@+id/img_3dots" android:layout_marginRight="-8dp" android:src="@drawable/ic_3dots" android:tint="#aaa" /> </GridLayout> <GridLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="8dp"> <TextView android:id="@+id/text_rating" android:layout_gravity="center_vertical" android:text="3.5" android:textColor="#009" android:textSize="14sp" /> <ImageView android:layout_gravity="center_vertical" android:layout_marginLeft="3dp" android:src="@drawable/ic_star" /> <TextView android:id="@+id/text_price" android:layout_columnWeight="1" android:layout_gravity="center_vertical" android:gravity="right" android:text="Free" android:textColor="#090" android:textSize="14sp" /> </GridLayout> </LinearLayout> |
menu/popup.xml
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<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/menu1" android:title="ติดตั้ง" /> <item android:id="@+id/menu2" android:title="เพิ่มเป็นสิ่งที่อยากได้" /> </menu> |
content_main.xml
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<?xml version="1.0" encoding="utf-8"?> <FrameLayout 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" android:id="@+id/content_main" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#def" app:layout_behavior="@string/appbar_scrolling_view_behavior" tools:context=".MainActivity" tools:showIn="@layout/activity_main"> <android.support.v7.widget.RecyclerView android:id="@+id/rcv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal"></android.support.v7.widget.RecyclerView> </FrameLayout> |
CustomHolder.java
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package com.phaisarn.myapplication; import android.support.v7.widget.RecyclerView; import android.view.View; import android.widget.ImageView; import android.widget.TextView; public class CustomHolder extends RecyclerView.ViewHolder { public ImageView imageView; public TextView textView; public ImageView img3dots; public CustomHolder(View convertView) { super(convertView); imageView = (ImageView) convertView.findViewById(R.id.image_top); textView = (TextView) convertView.findViewById(R.id.text_title); img3dots = (ImageView) convertView.findViewById(R.id.img_3dots); } } |
CustomItem.java
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package com.phaisarn.myapplication; public class CustomItem { public String text; public CustomItem(String text) { this.text = text; } } |
CustomAdapter.java
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package com.phaisarn.myapplication; import android.content.Context; import android.support.v7.widget.PopupMenu; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.MenuInflater; import android.view.View; import android.view.ViewGroup; import java.util.ArrayList; import java.util.Random; public class CustomAdapter extends RecyclerView.Adapter<CustomHolder> { private Context mContext; private ArrayList<CustomItem> mItems; public CustomAdapter(Context context, ArrayList<CustomItem> items) { mContext = context; mItems = items; } /* public interface OnItemClickListener { void onItemClick(View item, int position); } private OnItemClickListener mListener; public void setOnClickListener(OnItemClickListener listener) { mListener = listener; } */ @Override public int getItemCount() { return mItems.size(); } @Override public CustomHolder onCreateViewHolder(ViewGroup parent, int viewType) { LayoutInflater inflater = LayoutInflater.from(mContext); final View v = inflater.inflate(R.layout.custom_layout, parent, false); final CustomHolder vHolder = new CustomHolder(v); return vHolder; } @Override public void onBindViewHolder(final CustomHolder vHolder, int position) { CustomItem item = mItems.get(position); //กรณีที่ใช้ StaggeredGridLayout ให้เอาคอมเมนต์บรรทัดถัดไปออก //vHolder.imageView.getLayoutParams().height = getRandom(150, 300); vHolder.textView.setText(item.text); vHolder.img3dots.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int pos = vHolder.getAdapterPosition(); if (pos != RecyclerView.NO_POSITION) { PopupMenu popup = new PopupMenu(mContext, v); MenuInflater menuInflater = popup.getMenuInflater(); menuInflater.inflate(R.menu.popup, popup.getMenu()); popup.show(); } } }); } private int getRandom(int min, int max) { Random rand = new Random(); return min + rand.nextInt((max - min) + min); } } |
บรรทัดที่ 52 : กรณีที่ใช้ StaggeredGridLayout ให้เอาคอมเมนต์บรรทัดที่ 52 ออกด้วย
MainActivity.java
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package com.phaisarn.myapplication; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.SnapHelper; import android.view.Gravity; import com.github.rubensousa.gravitysnaphelper.GravitySnapHelper; import java.util.ArrayList; import java.util.Arrays; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); /* FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) .setAction("Action", null).show(); } }); */ ArrayList<CustomItem> items = new ArrayList<>(); items.addAll(Arrays.asList( new CustomItem("Cupcake"), new CustomItem("Donut"), new CustomItem("Eclair"), new CustomItem("Gingerbread"), new CustomItem("Froyo"), new CustomItem("Honeycomb"), new CustomItem("Ice Cream\nSandwich"), new CustomItem("Jellybean"), new CustomItem("Kitkat"), new CustomItem("Lollipop"), new CustomItem("Marshmallow"), new CustomItem("Nougat") )); CustomAdapter adapter = new CustomAdapter(this, items); RecyclerView rcv = (RecyclerView) findViewById(R.id.rcv); rcv.setAdapter(adapter); rcv.setLayoutManager(new LinearLayoutManager(this, RecyclerView.HORIZONTAL, false)); //rcv.setLayoutManager(new GridLayoutManager(this, 2)); //rcv.setLayoutManager(new StaggeredGridLayoutManager(3, RecyclerView.VERTICAL)); SnapHelper snap = null; snap = new GravitySnapHelper(Gravity.START); //snap = new GravitySnapHelper(Gravity.TOP); if (snap != null) { snap.attachToRecyclerView(rcv); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } } |
บรรทัดที่ 52 : เลือกใช้ LinearLayout แบบ horizontal, ต้องเรียกใช้บรรทัดที่ 57 ด้วย
บรรทัดที่ 53 : เลือกใช้ GridLayoutManager, ต้องเรียกใช้บรรทัดที่ 58 ด้วย
บรรทัดที่ 54 : เลือกใช้ StaggeredGridLayoutManager ซึ่งเป็นการจัดเรียงรายการแบบตารางคล้ายกับ GridLayoutManager แต่ขนาดของรายการอาจจะไม่สม่ำเสมอกันได้
บรรทัดที่ 57-58 : เป็นการเรียกใช้ GravitySnapHelper เพื่อทำให้การเลื่อนหยุดพอดีที่แนวขอบของรายการและของหน้าจอ (เลย์เอาต์) อยู่ตรงกัน
รูปที่ใช้