Android - 单击按钮时播放声音 - 空指针异常
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/3369068/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Android - play sound on button click - Null pointer exception
提问by Chris
I am trying to play a sound file on the click of a button. The sound is just 1 sec long. It plays well the first few times I click the button, but after a while it gives a NullPointerException. Here's the code:
我试图通过单击按钮播放声音文件。声音只有1秒长。我单击按钮的前几次播放效果很好，但过了一会儿，它给出了一个NullPointerException. 这是代码：
button[i].setOnClickListener(new OnClickListener() {
public void onClick(View view) {
mp = MediaPlayer.create(Test.this, R.raw.mysound);
mp.start();
}
});
And here's the exception:
这是例外：
07-29 23:07:27.690: ERROR/AndroidRuntime(10542): Uncaught handler: thread main exiting due to uncaught exception
07-29 23:07:27.710: ERROR/AndroidRuntime(10542): java.lang.NullPointerException
07-29 23:07:27.710: ERROR/AndroidRuntime(10542): at com.example.mypackage.Test.onClick(Test.java:270)
回答by Chris
Thanks you for your answers! Appreciate it!
谢谢你的回答！欣赏它！
Here's how I finally managed to get it work:
这是我最终设法让它工作的方式：
button[i].setOnClickListener(new OnClickListener() {
public void onClick(View view) {
mp = MediaPlayer.create(Test.this, R.raw.mysound);
mp.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
mp.release();
}
});
mp.start();
}
});
回答by Yoav Epstein
You can also try:
您也可以尝试：
final soundPool = new SoundPool(1, AudioManager.STREAM_MUSIC, 0);
final sound = soundPool.load(this, R.raw.mysound, 1);
button[i].setOnClickListener(new OnClickListener()
{
public void onClick(View view)
{
soundPool.play(sound, 1.0f, 1.0f, 0, 0, 1.0f);
}
});
回答by sohilv
It might solve your problem,
或许能解决你的问题
button[i].setOnClickListener(new OnClickListener() {
public void onClick(View view) {
new Thread(){
public void run(){
mp = MediaPlayer.create(Test.this, R.raw.mysound);
mp.start();
}.start();
}
});
回答by Vlad
You should catch Exception.
你应该捕捉异常。
try this code:
试试这个代码：
try{
MediaPlayer mplayer = MediaPlayer.create(contextTop, R.raw.<your sound>);
mplayer.start();
}catch(Exception e){
Log.d("<your TAG here>" , "error: " + e);
}
回答by Shreyash Mahajan
If still your issue not solved then try this as it help me.
如果您的问题仍未解决，请尝试此操作，因为它可以帮助我。
public void playSound(int resources){
try{
boolean mStartPlaying = true;
MediaPlayer mPlayer=null;
if (mStartPlaying==true){
mPlayer = new MediaPlayer();
Uri uri = Uri.parse("android.resource://YOUR_PACKAGENAME/" + resources);
mPlayer.setDataSource(getApplicationContext(),uri);
mPlayer.prepare();
mPlayer.start();
}
else{
mPlayer.release();
mPlayer = null;
}
mStartPlaying = !mStartPlaying;
}
catch (IOException e){
Log.e(LOG_TAG, "prepare() failed");
}
// MediaPlayer mp = MediaPlayer.create(SpyMainActivity.this, resources);
// mp.start();
}
Enjoy. :)
享受。:)
