第一行代码 8.4 播放多媒体(已解决)
问题可能不一样!!!
8.4.1
已确认代码无误,权限已加,手机根目录已放置相应同名文件。
使用真机运行的代码(手机型号:redmi K20)模拟器也尝试不成功,点击按钮后无效。
报错如下:
(并提示无法播放视屏)
W/VideoView: Unable to open content: /storage/emulated/0/movie.mp4
java.io.FileNotFoundException: /storage/emulated/0/movie.mp4:
open failed: EACCES (Permission denied)
具体原因不清楚,但是可以正常播放了
下面附上我的代码:
1.布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/play"
android:text="播放"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/pause"
android:text="暂停"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/replay"
android:text="重播"/>
</LinearLayout>
<VideoView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/video_view"/>
</LinearLayout>
2.MainActivity
package com.example.playvideotest;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import android.widget.VideoView;
import java.io.File;
import java.util.function.ToIntBiFunction;
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=findViewById(R.id.video_view);
Button play=findViewById(R.id.play);
Button pause=findViewById(R.id.pause);
Button replay=findViewById(R.id.replay);
play.setOnClickListener(this);
pause.setOnClickListener(this);
replay.setOnClickListener(this);
if (Build.VERSION.SDK_INT >= 23) {
int REQUEST_CODE_CONTACT = 101;
String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};//验证是否许可权限
for (String str : permissions) {
if (this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED)
{ //申请权限
this.requestPermissions(permissions, REQUEST_CODE_CONTACT);
return;
}
}
}
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();
}
}
private void initVideoPath(){
try {
File file=new File(Environment.getExternalStorageDirectory(),"/movie.mp4");
//File file=Context(getExternalFilesDir(String));
videoView.setVideoPath(file.getPath());
}catch (Exception e){
e.printStackTrace();
}
}
@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,"拒绝权限将无法使用程序", Toast.LENGTH_SHORT).show();
finish();
}
}
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.play:
if(!videoView.isPlaying()){
videoView.start();
}
break;
case R.id.pause:
if(videoView.isPlaying()){
videoView.pause();
}
break;
case R.id.replay:
if(videoView.isPlaying()){
videoView.resume();
}
break;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(videoView!=null){
videoView.suspend();
}
}
}
3.AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.playvideotest">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"
tools:ignore="ProtectedPermissions" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:requestLegacyExternalStorage="true"
android:theme="@style/AppTheme">
<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>