方向改变后播放位置重置为零
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【中文标题】方向改变后播放位置重置为零【英文标题】：Playback position resets to zero after orientation change 【发布时间】：2021-01-25 09:35:42 【问题描述】：下面是我的音乐播放器的代码。我使用 Videoview 播放本地精选歌曲列表。 我想在方向改变（纵向/横向）时存储和恢复播放位置。
我使用过 onSaveInstanceState 和 onRestoreInstanceState 方法。构建时没有错误，但歌曲每次都会重置。
我不知道出了什么问题。
package io.automaton.android.morningbinge;
import androidx.appcompat.app.AlertDialog;
import android.app.Activity;
import android.content.DialogInterface;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.widget.Toast;
import android.widget.VideoView;
import android.widget.MediaController;
import java.util.ArrayList;
public class MainActivity extends Activity
implements MediaPlayer.OnCompletionListener
VideoView vw;
ArrayList<Integer> videolist = new ArrayList<>();
int currvideo = 0;
int mPositionWhenPaused=0;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
vw = (VideoView)findViewById(R.id.videoView);
vw.setMediaController(new MediaController(this));
vw.setOnCompletionListener(this);
// video name should be in lower case alphabet.
videolist.add(R.raw.onbadhu_kolum);
videolist.add(R.raw.kala_bhairava_ashtakam);
videolist.add(R.raw.panchamukh_hanumath_kavacham);
videolist.add(R.raw.kandha_shashti_kavasam);
setVideo(videolist.get(0));
@Override
public void onSaveInstanceState(Bundle savedInstanceState)
super.onSaveInstanceState(savedInstanceState);
//we use onSaveInstanceState in order to store the video playback position for orientation change
savedInstanceState.putInt("Position", vw.getCurrentPosition());
vw.pause();
@Override
public void onRestoreInstanceState(Bundle savedInstanceState)
super.onRestoreInstanceState(savedInstanceState);
//we use onRestoreInstanceState in order to play the video playback from the stored position
mPositionWhenPaused = savedInstanceState.getInt("Position");
vw.seekTo(mPositionWhenPaused);
public void setVideo(int id)
String uriPath
= "android.resource://"
+ getPackageName() + "/" + id;
Uri uri = Uri.parse(uriPath);
vw.setVideoURI(uri);
vw.start();
public void onCompletion(MediaPlayer mediapalyer)
AlertDialog.Builder obj = new AlertDialog.Builder(this);
obj.setTitle("Playback Finished!");
obj.setIcon(R.mipmap.ic_launcher);
MyListener m = new MyListener();
obj.setPositiveButton("Replay", m);
obj.setNegativeButton("Next", m);
obj.setMessage("Want to replay or play next video?");
obj.show();
class MyListener implements DialogInterface.OnClickListener
public void onClick(DialogInterface dialog, int which)
if (which == -1)
vw.seekTo(0);
vw.start();
else
++currvideo;
if (currvideo == videolist.size())
currvideo = 0;
setVideo(videolist.get(currvideo));
【问题讨论】：
你能在你的 AndroidManifest 文件中分享这个活动声明吗？ 您可能想尝试在其中设置配置更改而不是维护状态。例如，如果您在活动声明中设置 android:configChanges="orientation|keyboardHidden|screenSize" 内联，您会看到每次方向更改时都不会重新启动活动。我解决了这个问题。我改变了调用列表的方式，以使用 setOnPreparedListener 进行播放，寻找最后播放的位置。
... 主要活动
package io.automaton.android.morningbinge;
import androidx.appcompat.app.AlertDialog;
import android.app.Activity;
import android.content.DialogInterface;
import android.content.res.Configuration;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import android.widget.VideoView;
import android.widget.MediaController;
import android.media.MediaPlayer.OnPreparedListener;
import java.util.ArrayList;
public class MainActivity extends Activity
implements MediaPlayer.OnCompletionListener
VideoView vw;
ArrayList<Integer> videolist = new ArrayList<>();
int currvideo = 0;
int mPositionWhenPaused=0;
private static final String TAG = "MyActivity";
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
vw = (VideoView)findViewById(R.id.videoView);
vw.setMediaController(new MediaController(this));
vw.setOnCompletionListener(this);
videolist.add(R.raw.onbadhu_kolum);
videolist.add(R.raw.kala_bhairava_ashtakam);
videolist.add(R.raw.panchamukh_hanumath_kavacham);
videolist.add(R.raw.kandha_shashti_kavasam);
try
//set the uri of the video to be played
vw.setVideoURI(Uri.parse("android.resource://" + getPackageName() + "/" + videolist.get(0)));
catch (Exception e)
Log.e("Error", e.getMessage());
e.printStackTrace();
View decorView = getWindow().getDecorView();
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN;
decorView.setSystemUiVisibility(uiOptions);
vw.requestFocus();
vw.setOnPreparedListener(new OnPreparedListener()
public void onPrepared(MediaPlayer mediaPlayer)
vw.seekTo(mPositionWhenPaused);
if (mPositionWhenPaused == 0)
vw.start();
else
vw.pause();
);
@Override
public void onSaveInstanceState(Bundle savedInstanceState)
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putInt("Position", vw.getCurrentPosition());
Log.i("Orientation Change", "Warn-orientation change and saved");
vw.pause();
@Override
public void onRestoreInstanceState(Bundle savedInstanceState)
super.onRestoreInstanceState(savedInstanceState);
mPositionWhenPaused = savedInstanceState.getInt("Position");
vw.seekTo(mPositionWhenPaused);
Log.i("restored", "restored after orientation change");
public void onCompletion(MediaPlayer mediapalyer)
++currvideo;
if (currvideo == videolist.size())
currvideo = 0;
setVideo(videolist.get(currvideo));
...
android manifest
<?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="io.automaton.android.morningbinge">
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.INTERNET" />
<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">
<activity android:name=".MainActivity"
android:configChanges="orientation|screenSize|screenLayout|keyboardHidden">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
...
【讨论】：
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