Android编码的新功能。我试图让用户使用“上载”按钮为MediaPlayer选择要播放的音频文件，然后一旦用户单击“播放”，MediaPlayer应该开始播放该文件。到目前为止，这是我的代码:
public class MainActivity extends Activity {
final int ACTIVITY_CHOOSE_FILE = 1;
File original;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button) this.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent chooseFile;
Intent intent;
chooseFile = new Intent(Intent.ACTION_GET_CONTENT);
chooseFile.setType("audio/mpeg");
intent = Intent.createChooser(chooseFile, "Choose a file");
startActivityForResult(intent, ACTIVITY_CHOOSE_FILE);
}
});
Button playButton = (Button)findViewById(R.id.playbutton);
playButton.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource(original.getAbsolutePath());
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
}
});
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case ACTIVITY_CHOOSE_FILE: {
if (resultCode == RESULT_OK) {
Uri uri = data.getData();
original = new File(uri.getPath());
String tag = "TAG";
Log.d(tag, original.getAbsolutePath());
}
}
}
}
}
我可以选择合适的音频文件，但是一旦点击播放，就什么也没有发生。我究竟做错了什么？
最佳答案
设置mediaPlayer数据源后，您必须调用mediaPlayer.prepareAsync()
Media Playback in android
关于android - 在Android的MediaPlayer上播放音频时遇到问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33902646/