问题遇到的现象和发生背景
在Android Studio上写了一个音乐播放器,但是会报错。
问题相关代码,请勿粘贴截图
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
SongsDetail songsdetail = (SongsDetail) msg.obj;
//用Media加载音乐
try {
Log.d(TAG, "handleMessage: 创建音乐对象");
//获取需求的数据,给MediaPlayer初始化
initMedia(songsdetail.getUrl());
//设置SeekBar最大值
seekBar.setMax(mediaPlayer.getDuration());
//显示总时长
textView_total.setText(getTime(mediaPlayer.getDuration()));
//显示歌名
textView_songsTitle.setText(songsdetail.getSongName());
} catch (IOException e) {
Toast.makeText(getApplication(),"出了点问题!",Toast.LENGTH_SHORT).show();
}
}
};
public void initMedia(String url) throws IOException {
try {
mediaPlayer = new MediaPlayer();
mediaPlayer.setDataSource(url);
} catch (Exception e){
Toast.makeText(getApplication(),"出了点问题!",Toast.LENGTH_SHORT).show();
}
mediaPlayer.prepare();
}
运行结果及报错内容
E/AndroidRuntime: FATAL EXCEPTION: main
Process: hnkjzyxy.class3202.ending, PID: 10245
java.lang.IllegalStateException
at android.media.MediaPlayer._prepare(Native Method)
at android.media.MediaPlayer.prepare(MediaPlayer.java:1259)
at hnkjzyxy.class3202.ending.SongsDetailActivity.initMedia(SongsDetailActivity.java:111)
at hnkjzyxy.class3202.ending.SongsDetailActivity$1.handleMessage(SongsDetailActivity.java:48)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)