Android无线电流，蒸汽链接不起作用

Question

我在Online radio streaming app for Android

上跟踪了zvzej的帖子

我遇到了两个问题：

1st。）流链接不播放，虽然buttonPlay.enabled（false）确实有效，但我也看不到进度条，尽管onClick它应该是可见的。这是否意味着剧本不能超越

 playSeekBar.setVisibility(View.VISIBLE);

在startPlaying（）？

第二。）点击播放，然后停止，然后返回播放，应用程序强制崩溃，有时需要更多点击，有时更少。

代码：

 package com.afghan.radios;

 import android.app.Activity;
 import android.os.Bundle;

 import java.io.IOException;

 import android.media.MediaPlayer;
 import android.media.MediaPlayer.OnBufferingUpdateListener;
 import android.media.MediaPlayer.OnPreparedListener;
 import android.util.Log;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.ProgressBar;

 public class ArmanFMRadio extends Activity implements OnClickListener {

private ProgressBar playSeekBar;
private Button buttonPlay;
private Button buttonStopPlay;
private MediaPlayer player;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.armanfm);
    initializeUIElements();
    initializeMediaPlayer();

}

private void initializeUIElements() {

    playSeekBar = (ProgressBar) findViewById(R.id.progressBar1);
    playSeekBar.setMax(100);
    playSeekBar.setVisibility(View.INVISIBLE);

    buttonPlay = (Button) findViewById(R.id.buttonPlay);
    buttonPlay.setOnClickListener(this);

    buttonStopPlay = (Button) findViewById(R.id.buttonStopPlay);
    buttonStopPlay.setEnabled(false);
    buttonStopPlay.setOnClickListener(this);

}

private void initializeMediaPlayer() {
    player = new MediaPlayer();
    try {
        player.setDataSource("http://usa8-vn.mixstream.net:8138");
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    player.setOnBufferingUpdateListener(new OnBufferingUpdateListener() {

        public void onBufferingUpdate(MediaPlayer mp, int percent) {
            playSeekBar.setVisibility(View.VISIBLE);
            playSeekBar.setSecondaryProgress(percent);
            Log.i("Buffering", "" + percent);

        }
    });
}

public void onClick(View v) {
    if (v == buttonPlay) {
        startPlaying();
    } else if (v == buttonStopPlay) {
        stopPlaying();
    }
}

private void startPlaying() {
    buttonStopPlay.setEnabled(true);
    buttonPlay.setEnabled(false);

    playSeekBar.setVisibility(View.VISIBLE);

    player.prepareAsync();

    player.setOnPreparedListener(new OnPreparedListener() {

        public void onPrepared(MediaPlayer mp) {
            try {
                player.prepare();
                player.start();

            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
    });

}

private void stopPlaying() {
    if (player.isPlaying()) {
        player.stop();
        player.release();
        initializeMediaPlayer();
    }

    buttonPlay.setEnabled(true);
    buttonStopPlay.setEnabled(false);
    playSeekBar.setVisibility(View.INVISIBLE);
}

@Override
protected void onPause() {
    super.onPause();
    if (player.isPlaying()) {
        player.stop();
    }

 }
}