Android文件列表RecyclerView中点击视频播放
16lz
2021-01-23
Android文件列表RecyclerView中点击视频播放
1. app gradle
dependencies {
implementation 'androidx.recyclerview:recyclerview:1.1.0'implementation 'com.google.android.exoplayer:exoplayer:2.11.1'2. AndroidManifest配置
<?xml version="1.0" encoding="utf-8"?>:android="http://schemas.android.com/apk/res/android" package="com.example.myitemtouch"> :allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> :name=".MySimpleExoPlayer" android:configChanges="orientation"> > :name=".MainActivity" android:configChanges="orientation"> -filter> :name="android.intent.action.MAIN" /> :name="android.intent.category.LAUNCHER" /> -filter> > > -permission android:name="android.permission.READ_EXTERNAL_STORAGE" />> 3. activity布局
MainActivity
package com.example.myitemtouch;import androidx.annotation.NonNull;import androidx.appcompat.app.AppCompatActivity;import androidx.recyclerview.widget.LinearLayoutManager;import androidx.recyclerview.widget.RecyclerView;import android.content.Intent;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import java.io.File;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class MainActivity extends AppCompatActivity { private RecyclerView recyclerView; private RecyclerView.Adapter adapter; private RecyclerView.LayoutManager layoutManager; private List<MyFile> myFileList = new ArrayList<>(); private OnItemClickListener onItemClickListener; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); recyclerView = findViewById(R.id.recyclerview); // use this setting to improve performance if you know that changes // in content do not change the layout size of the RecyclerView recyclerView.setHasFixedSize(true); // use a linear layout manager layoutManager = new LinearLayoutManager(this); recyclerView.setLayoutManager(layoutManager); // specify an adapter (see also next example) adapter = new MyAdapter(myFileList); recyclerView.setAdapter(adapter); onItemClickListener = new OnItemClickListener() { @Override public void onItemClick(MyAdapter.MyViewHolder viewHolder) { Log.d("Main","onItemClick"); //RecyclerView.ViewHolder mViewHolder; MyAdapter.MyViewHolder mViewHolder; mViewHolder = viewHolder; String vhText = (String) mViewHolder.textView.getText(); Log.d("Main",vhText); Intent intent = new Intent(MainActivity.this,MySimpleExoPlayer.class); intent.putExtra("fileName",vhText); startActivity(intent); } }; recyclerView.addOnItemTouchListener(new RecyclerItemTouchListener(recyclerView) { }); initMyFile(Environment.getExternalStorageDirectory()); } private void initMyFile(File externalStorageDirectory) { myFileList.clear(); List<File> files = new ArrayList<>(); Collections.addAll(files, externalStorageDirectory.listFiles()); for (File file : files) { String fileName = file.getName(); MyFile myFile = new MyFile(fileName); myFileList.add(myFile); } adapter.notifyDataSetChanged(); } private class mySimpleGestureListener extends GestureDetector.SimpleOnGestureListener { @Override public boolean onSingleTapUp(MotionEvent event) { Log.d("Main","SingleTap"); View childView = recyclerView.findChildViewUnder(event.getX(),event.getY()); if (childView != null && onItemClickListener != null) { MyAdapter.MyViewHolder viewHolder = (MyAdapter.MyViewHolder) recyclerView.getChildViewHolder(childView); Log.d("Main","onItemClick"); onItemClickListener.onItemClick(viewHolder); } return true; } } public abstract class RecyclerItemTouchListener extends RecyclerView.SimpleOnItemTouchListener { private GestureDetector mGestureDetector; private RecyclerView mRecyclerView; public RecyclerItemTouchListener(RecyclerView recyclerView) { mRecyclerView = recyclerView; mGestureDetector = new GestureDetector(mRecyclerView.getContext(),new mySimpleGestureListener()); } @Override public boolean onInterceptTouchEvent(@NonNull RecyclerView rv, @NonNull MotionEvent e) { mGestureDetector.onTouchEvent(e); return false; } @Override public void onTouchEvent(@NonNull RecyclerView rv, @NonNull MotionEvent e) { mGestureDetector.onTouchEvent(e); } @Override public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { } }}MySimpleExoPlayer
package com.example.myitemtouch;import androidx.appcompat.app.AppCompatActivity;import android.content.Context;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import com.google.android.exoplayer2.SimpleExoPlayer;import com.google.android.exoplayer2.source.MediaSource;import com.google.android.exoplayer2.source.ProgressiveMediaSource;import com.google.android.exoplayer2.ui.PlayerView;import com.google.android.exoplayer2.upstream.DataSource;import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;import com.google.android.exoplayer2.util.Util;public class MySimpleExoPlayer extends AppCompatActivity { private String fileName; private PlayerView playerView; private SimpleExoPlayer player; private Context context = MySimpleExoPlayer.this; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_my_simple_exo_player); Intent intent = getIntent(); fileName = intent.getStringExtra("fileName"); playerView = findViewById(R.id.exo_player); initializePlayer(); } private void initializePlayer() { player = new SimpleExoPlayer.Builder(context).build(); playerView.setPlayer(player); DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(context, Util.getUserAgent(context,"myExoPlayer")); MediaSource mediaSource = new ProgressiveMediaSource.Factory(dataSourceFactory) .createMediaSource(Uri.parse(Environment.getExternalStorageDirectory() + "/" + fileName)); player.prepare(mediaSource); } @Override public void onBackPressed() { super.onBackPressed(); player.release(); }}4.其它类
MyAdapter //适配器，填充数据
package com.example.myitemtouch;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import androidx.recyclerview.widget.RecyclerView;import java.util.List;public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> { private List<MyFile> mFileList; public MyAdapter(List<MyFile> myFileList) { mFileList = myFileList; } public class MyViewHolder extends RecyclerView.ViewHolder { public TextView textView; public MyViewHolder(View v) { super(v); textView = v.findViewById(R.id.textView); } } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v = LayoutInflater.from(parent.getContext()) .inflate(R.layout.my_view, parent, false); MyViewHolder myViewHolder = new MyViewHolder(v); return myViewHolder; } @Override public void onBindViewHolder(MyViewHolder holder, int position) { MyFile myFile = mFileList.get(position); holder.textView.setText(myFile.getFileName()); } @Override public int getItemCount() { return mFileList.size(); }}MyFile
package com.example.myitemtouch;public class MyFile { private String fileName; public MyFile(String fileName) { super(); this.fileName = fileName; } public String getFileName() { return fileName; }}OnItemClickListener //接口定义
package com.example.myitemtouch;public interface OnItemClickListener { void onItemClick(MyAdapter.MyViewHolder viewHolder);}5. 关键代码
//在布局中添加了 RecyclerView 微件之后，获取对象句柄，将其连接到布局管理器，并为要显示的数据附加适配器
// use this setting to improve performance if you know that changes// in content do not change the layout size of the RecyclerViewrecyclerView.setHasFixedSize(true);// use a linear layout managerlayoutManager = new LinearLayoutManager(this);recyclerView.setLayoutManager(layoutManager);// specify an adapter (see also next example)adapter = new MyAdapter(myFileList);recyclerView.setAdapter(adapter);//要将所有数据输入列表中，您必须扩展 RecyclerView.Adapter 类。此对象会创建项的视图，并在原始项不再可见时用新数据项替换部分视图的内容。
//MyViewHolder参数需要是View,否则报错(TextView与String[]类型不匹配)
public MyViewHolder(View v) { super(v); textView = v.findViewById(R.id.textView);}@Overridepublic MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v = LayoutInflater.from(parent.getContext()) .inflate(R.layout.my_view, parent, false); MyViewHolder myViewHolder = new MyViewHolder(v); return myViewHolder;}//设置R.layout.my_view中的textView
@Overridepublic void onBindViewHolder(MyViewHolder holder, int position) { MyFile myFile = mFileList.get(position); holder.textView.setText(myFile.getFileName());}//初始化文件列表，将指定文件夹内的所有文件信息，添加到List中；
//通过List中保存的每一个信息，生成RecyclerView Adapter需要的数据，并添加进去。
private void initMyFile(File externalStorageDirectory) { myFileList.clear(); List<File> files = new ArrayList<>(); Collections.addAll(files, externalStorageDirectory.listFiles()); for (File file : files) { String fileName = file.getName(); MyFile myFile = new MyFile(fileName); myFileList.add(myFile); } adapter.notifyDataSetChanged();}//RecyclerView item点击
//addOnItemTouchListener (API) 借助GestureDetectorCompat根据触摸手势来判断是否为点击事件
recyclerView.addOnItemTouchListener(new RecyclerItemTouchListener(recyclerView) {});//触摸手势监听
public abstract class RecyclerItemTouchListener extends RecyclerView.SimpleOnItemTouchListener { private GestureDetector mGestureDetector; private RecyclerView mRecyclerView; public RecyclerItemTouchListener(RecyclerView recyclerView) { mRecyclerView = recyclerView; mGestureDetector = new GestureDetector(mRecyclerView.getContext(),new mySimpleGestureListener()); } @Override public boolean onInterceptTouchEvent(@NonNull RecyclerView rv, @NonNull MotionEvent e) { mGestureDetector.onTouchEvent(e); return false; } @Override public void onTouchEvent(@NonNull RecyclerView rv, @NonNull MotionEvent e) { mGestureDetector.onTouchEvent(e); } @Override public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { }}//GestureDetector手势实现
private class mySimpleGestureListener extends GestureDetector.SimpleOnGestureListener { @Override public boolean onSingleTapUp(MotionEvent event) { Log.d("Main","SingleTap"); View childView = recyclerView.findChildViewUnder(event.getX(),event.getY()); if (childView != null && onItemClickListener != null) { MyAdapter.MyViewHolder viewHolder = (MyAdapter.MyViewHolder) recyclerView.getChildViewHolder(childView); Log.d("Main","onItemClick"); onItemClickListener.onItemClick(viewHolder); } return true; } }//onItemClickListener接口实现
onItemClickListener = new OnItemClickListener() { @Override public void onItemClick(MyAdapter.MyViewHolder viewHolder) { Log.d("Main","onItemClick"); //RecyclerView.ViewHolder mViewHolder; MyAdapter.MyViewHolder mViewHolder; mViewHolder = viewHolder; String vhText = (String) mViewHolder.textView.getText(); Log.d("Main",vhText); Intent intent = new Intent(MainActivity.this,MySimpleExoPlayer.class); intent.putExtra("fileName",vhText); startActivity(intent); }};//MySimpleExoPlayer播放点击的item
private void initializePlayer() { player = new SimpleExoPlayer.Builder(context).build(); playerView.setPlayer(player); DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(context, Util.getUserAgent(context,"myExoPlayer")); MediaSource mediaSource = new ProgressiveMediaSource.Factory(dataSourceFactory) .createMediaSource(Uri.parse(Environment.getExternalStorageDirectory() + "/" + fileName)); player.prepare(mediaSource);}参考链接：
https://developer.android.google.cn/guide/topics/ui/layout/recyclerview?hl=zh_cn#java
MyViewHolder参数需要是View,否则报错(TextView与String[]类型不匹配)
https://www.jianshu.com/p/4fc6164e4709
RecyclerView 的item显示的间距过大(item占满父布局)
https://www.jianshu.com/p/3047c050b556
文件列表
https://blog.csdn.net/qq_40019723/article/details/79369529
https://blog.csdn.net/u013372185/article/details/52415234
RecyclerView item点击
https://segmentfault.com/a/1190000005176416
https://blog.csdn.net/u010940300/article/details/48806035
http://syang.site/2017/05/13/Android-RecyclerView%E9%80%9A%E8%BF%87addOnItemTouchListener%E5%A4%84%E7%90%86onClick%E7%82%B9%E5%87%BB%E4%BA%8B%E4%BB%B6/
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