在Android中，当我播放音频并进行其他活动时，返回后音频不会停止 [英] In Android, When I Play Audio and go to other activity, audio doesn't stop after coming back
问题描述
我是Android环境中的新手，我的问题是当我播放音频文件并转到其他活动或按后退"按钮，然后再次在我播放音频的地方打开我的应用程序时，按Stop时并没有停止按钮.当我按下主页按钮并尝试停止时它起作用.谁能建议我该怎么做 这是我的活动代码
I'm new in Android environment, my problem is while I Play audio file and go to other activity or press back button, and again open my application where I've played audio, it doesn't stop while i press stop button. it works when i press home button and try to stop. can anyone suggest me what to Here's the code of my activity
package com.example.mudassar.myaudioapp;
import android.content.Intent;
import android.os.Environment;
import android.os.NetworkOnMainThreadException;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.media.MediaPlayer;
import android.os.Handler;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
//MediaPlayer mp;
Button playBtn, pauseBtn, stopBtn;
SeekBar sb;
Handler han = new Handler();
MediaPlayer mp;// = MediaPlayer.create(MainActivity.this, R.raw.firefly);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
playBtn= (Button)findViewById(R.id.playBtn);
pauseBtn= (Button)findViewById(R.id.pauseBtn);
stopBtn=(Button) findViewById(R.id.stopBtn);
try{
//you can change the path, here path is external directory(e.g. sdcard) /Music/maine.mp3
//mp.setDataSource(Environment.getExternalStorageDirectory().getPath()+"/raw/.mp3");
mp = MediaPlayer.create(MainActivity.this, R.raw.firefly);
mp.prepare();
}catch(Exception e){e.printStackTrace();}
sb = (SeekBar)findViewById(R.id.seekBar);
sb.setMax(mp.getDuration());
SeekUpdation();
playBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SeekUpdation();
//if (mp == null)
if(mp.isPlaying() == false)
mp = MediaPlayer.create(MainActivity.this, R.raw.firefly);
mp.start();
sb.setMax(mp.getDuration());
sb.setProgress(mp.getCurrentPosition());
}
});
pauseBtn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
if(mp.isPlaying() == false){
mp.start();
sb.setProgress(mp.getCurrentPosition());
Toast.makeText(MainActivity.this, "Playing", Toast.LENGTH_SHORT).show();
}else if(mp.isPlaying() == true){
mp.pause();
sb.setProgress(mp.getCurrentPosition());
Toast.makeText(MainActivity.this, "Paused", Toast.LENGTH_SHORT).show();
}
}
});
stopBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//if (mp != null) {
if(mp.isPlaying() == true){
mp.stop();
sb.setProgress(mp.getDuration());
//mp = null;
}
Toast.makeText(MainActivity.this, "Stoped", Toast.LENGTH_SHORT).show();
}
});
sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){
@Override
public void onStopTrackingTouch(SeekBar seekBar){
//if(mp!=null){
if(!mp.isPlaying()){
mp.seekTo(seekBar.getProgress());
mp.start();
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar){
//if(mp!=null)
if(mp.isPlaying()){
mp.pause();
}else
mp.start();
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser){
}
});
Button btn = (Button)findViewById(R.id.secondActivityButton);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, second.class));
}
});
}
public void MyOwnClick(View v){
startActivity(new Intent(MainActivity.this, second.class));
}
public Runnable run = new Runnable() {
@Override
public void run() {
SeekUpdation();
}
};
public void SeekUpdation() {
//if(mp!=null)
if(mp.isPlaying() == true)
{
sb.setProgress(mp.getCurrentPosition());
han.postDelayed(run, 1000);
//Toast.makeText(MainActivity.this, "is Playing", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this, "Seek", Toast.LENGTH_SHORT).show();
}
}
}
推荐答案
对于快速解决方案，您可以创建如下方法:
For a quick solution you can create a method like this:
void resetMediaPlayer() {
if(mediaPlayer!=null) {
try {
mediaPlayer.reset();
}
catch(Exception e) {
e.printStackTrace();
}
}
}
然后在activity中覆盖onBackPressed方法并调用resetMediaPlayer:
Then override the onBackPressed method in your activity and call resetMediaPlayer :
@Override
public void onBackPressed(){
super.onBackPressed();
resetMediaPlayer()
}
或在需要停止media player的任何地方调用它.
Or call it anywhere you need to stop your media player.
这不是停止媒体播放器的好方法.为了获得更好的实现，您必须像这样更改resetMediaPlayer方法:
This is not a good way to stop media player though. for a better implementation you have to change your resetMediaPlayer method like this:
void resetMediaPlayer() {
if(mediaPlayer!=null) {
try {
mediaPlayer.reset();
mediaPlayer.release();
}
catch(Exception e) {
e.printStackTrace();
}
}
}
并且每当要启动Media Player时，都必须创建Media Player的新实例，例如:
And whenever you want to start Media Player you have to create a new instance of Media Player for example:
void startMediaPlayer(int selectedSong) {
try {
mediaPlayer = MediaPlayer.create(activity, selectedSong);
mediaPlayer.start();
} catch (Exception e) {
e.printStackTrace();
}
}
并在activity的onDestroy方法中调用resetMediaPlayer:
@Override
protected void onDestroy() {
super.onDestroy();
resetPlayView();
}
这篇关于在Android中，当我播放音频并进行其他活动时，返回后音频不会停止的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
