VideoView 在播放视频前会有黑屏，点击播放时，黑屏才会消失。原因是videoview加载资源需要一定的耗时，我们可以利用MediaMetadataRetriever来解决黑屏问题。
如何利用VideoView 播放视频呢？
一、mainfest.xml给入读SD的权限
二、绑定View
Mainfest.xml文件
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.xxxx.playvideo"> //给入读写权限 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <application android: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" android:requestLegacyExternalStorage="true"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>Activity:
package com.xxx.playvideo; import androidx.annotation.RequiresApi; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import android.Manifest; import android.app.Activity; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.Color; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.media.MediaMetadataRetriever; import android.media.MediaPlayer; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.view.View; import android.widget.Button; import android.widget.MediaController; import android.widget.VideoView; public class MainActivity extends AppCompatActivity implements Button.OnClickListener { VideoView videoView; Button pause_btn; Button start_btn; private final int REQUEST_EXTERNAL_STORAGE = 1; //设置权限 private String[] PERMISSIONS_STORAGE = { Manifest.permission.READ_EXTERNAL_STORAGE}; @RequiresApi(api = Build.VERSION_CODES.R) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); verifyStoragePermissions(this); init(); } @RequiresApi(api = Build.VERSION_CODES.R) private void init() { videoView = findViewById(R.id.video); start_btn = findViewById(R.id.play_video); start_btn.setOnClickListener(this); pause_btn = findViewById(R.id.pause); pause_btn.setOnClickListener(this); //读取SD卡中的视频文件 Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/Movies/video.mp4"); videoView.setVideoPath(uri.getPath()); MediaController mediaController = new MediaController(this); videoView.setMediaController(mediaController); mediaController.setMediaPlayer(videoView); //利用 MediaMetadataRetriever 解决缓冲黑屏问题 MediaMetadataRetriever media = new MediaMetadataRetriever(); media.setDataSource(uri.getPath()); //获取视频中的第一帧照片，设置为封面 Bitmap bitmap = media.getFrameAtTime(1, MediaMetadataRetriever.OPTION_CLOSEST_SYNC ); Drawable drawable = new BitmapDrawable(getResources(),bitmap); videoView.setBackground(drawable); media.release(); videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { @Override public void onPrepared(MediaPlayer mediaPlayer) { mediaPlayer.setOnInfoListener(new MediaPlayer.OnInfoListener() { @Override public boolean onInfo(MediaPlayer mediaPlayer, int i, int i1) { if (i == MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START) { videoView.setBackgroundColor(Color.TRANSPARENT); } return true; } }); } }); } public void verifyStoragePermissions(Activity activity) { // Check if we have write permission int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.READ_EXTERNAL_STORAGE); if (permission != PackageManager.PERMISSION_GRANTED) { // We don't have permission so prompt the user ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE); } } @Override public void onClick(View view) { switch (view.getId()) { case R.id.play_video: videoView.start(); break; case R.id.pause: videoView.pause(); break; default: break; } } }