如果你看过我的《android音乐播放简单实现（MediaPlayer）》，那么本篇将会毫无压力。
首先是主界面的三个按钮和一个播放控件
<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.cofox.myplayvideo.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/btnPlay"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Play"
android:textAllCaps="false" />
<Button
android:id="@+id/btnPause"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Pause"
android:textAllCaps="false" />
<Button
android:id="@+id/btnReplay"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Replay"
android:textAllCaps="false" />
</LinearLayout>
<VideoView
android:id="@+id/vdvwFilm"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
在 MainActivity.java 中这里需要用到的是 VideoView 作为视频播放时的显示位置。
private VideoView videoView;
在 onCreate 里，对界面的按钮和显示位置实例化，并检查权限。
videoView = (VideoView)findViewById(R.id.vdvwFilm);
Button btnPlay = (Button)findViewById(R.id.btnPlay);
Button btnPause = (Button)findViewById(R.id.btnPause);
Button btnReplay = (Button)findViewById(R.id.btnReplay);
btnPlay.setOnClickListener(this);
btnPause.setOnClickListener(this);
btnReplay.setOnClickListener(this);
if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}else {
initVideoPath();//初始化MediaPlayer
}
用一个单独的方法 initVideoPath() 来实现视频播放初始化
private void initVideoPath() {
File file = new File(Environment.getExternalStorageDirectory(), "movie2.mp4");
videoView.setVideoPath(file.getPath());//指定视频文件路径
videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.setLooping(true);//让电影循环播放
}
});
}
onRequestPermissionsResult 中对权限的取得结果进行判断，并针对性操作。如果获得了权限，就执行初始化；如果没有获得权限，就提示用户。
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode){
case 1:
if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
initVideoPath();
}else{
Toast.makeText(this, "拒绝权限，无法使用程序。", Toast.LENGTH_LONG).show();
finish();
}
break;
default:
break;
}
}
在一个 onClick 方法中，统一处理 Play(播放)、Pause(暂停)、Replay(重新播放)的逻辑。
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btnPlay:
if(!videoView.isPlaying()){
videoView.start();//播放
}
break;
case R.id.btnPause:
if(videoView.isPlaying()){
videoView.pause();//暂停
}
break;
case R.id.btnReplay:
if(videoView.isPlaying()){
videoView.resume();//重新播放
}
break;
}
}
执行完毕，释放所有资源。
@Override
protected void onDestroy() {
super.onDestroy();
if(videoView != null){
videoView.suspend();
}
}
完整代码示例：
package com.cofox.myplayvideo;
import android.Manifest;
import android.content.pm.PackageManager;
import android.media.MediaPlayer;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.os.EnvironmentCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import android.widget.VideoView;
import java.io.File;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private VideoView videoView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
videoView = (VideoView)findViewById(R.id.vdvwFilm);
Button btnPlay = (Button)findViewById(R.id.btnPlay);
Button btnPause = (Button)findViewById(R.id.btnPause);
Button btnReplay = (Button)findViewById(R.id.btnReplay);
btnPlay.setOnClickListener(this);
btnPause.setOnClickListener(this);
btnReplay.setOnClickListener(this);
if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}else {
initVideoPath();//初始化MediaPlayer
}
}
private void initVideoPath() {
File file = new File(Environment.getExternalStorageDirectory(), "movie2.mp4");
videoView.setVideoPath(file.getPath());//指定视频文件路径
videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.setLooping(true);//让电影循环播放
}
});
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode){
case 1:
if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
initVideoPath();
}else{
Toast.makeText(this, "拒绝权限，无法使用程序。", Toast.LENGTH_LONG).show();
finish();
}
break;
default:
break;
}
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btnPlay:
if(!videoView.isPlaying()){
videoView.start();//播放
}
break;
case R.id.btnPause:
if(videoView.isPlaying()){
videoView.pause();//暂停
}
break;
case R.id.btnReplay:
if(videoView.isPlaying()){
videoView.resume();//重新播放
}
break;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(videoView != null){
videoView.suspend();
}
}
}
在 AndroidManifest.xml 中配置相应的权限。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.cofox.myplayvideo">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
...
然后我们就可以看到运行结果了。
