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我有使机器人一个应用程序中,我需要三个按钮的XML和Java中我设置了onclick事件,如何改变从停止到开始的歌曲状态?
播放按钮被点击时的歌曲准备和发挥, 点击停止按钮时乐曲停止, 单击暂停按钮时歌曲暂停。
但我的问题是,当我点击播放后,我就停止按钮,然后我点击播放按钮后,乐曲停止播放时点击按钮歌曲播放,但此时的歌曲无法播放,
我的代码为此应用创建。在下面给出。
package com.mydemo;
import java.io.IOException;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MydemoActivity extends Activity {
/** Called when the activity is first created. */
Button bPlay,bPause,bStop;
MediaPlayer mp;
int position = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mp = MediaPlayer.create(this, R.raw.fluet);
bPlay = (Button) findViewById(R.id.bPlay);
bPause = (Button)findViewById(R.id.bPause);
bStop = (Button) findViewById(R.id.bStop);
bPause.setVisibility(View.GONE);
mp.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer arg0) {
position = 0;
bPlay.setVisibility(View.VISIBLE);
bPause.setVisibility(View.GONE);
}
});
bPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(position > 0)
{
mp.seekTo(position);
mp.start();
}
try {
mp.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
mp.start();
bPlay.setVisibility(View.GONE);
bPause.setVisibility(View.VISIBLE);
}
});
bPause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(mp!=null)
{
mp.pause();
position = mp.getCurrentPosition();
}
bPlay.setVisibility(View.VISIBLE);
bPause.setVisibility(View.GONE);
}
});
bStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
mp.stop();
position = 0;
bPlay.setVisibility(View.VISIBLE);
bPause.setVisibility(View.GONE);
}
});
}
}
看到更新后的代码:
package com.mydemo;
import java.io.IOException;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MydemoActivity extends Activity {
/** Called when the activity is first created. */
Button bPlay,bPause,bStop;
MediaPlayer mp;
int position = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mp = MediaPlayer.create(this, R.raw.fluet);
bPlay = (Button) findViewById(R.id.bPlay);
bPause = (Button)findViewById(R.id.bPause);
bStop = (Button) findViewById(R.id.bStop);
bPause.setVisibility(View.GONE);
mp.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer arg0) {
position = 0;
bPlay.setVisibility(View.VISIBLE);
bPause.setVisibility(View.GONE);
}
});
bPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(mp.isPlaying() == false)
{
try {
mp.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
mp.start();
}
bPlay.setVisibility(View.GONE);
bPause.setVisibility(View.VISIBLE);
}
});
bPause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(mp!=null)
{
mp.pause();
position = mp.getCurrentPosition();
}
bPlay.setVisibility(View.VISIBLE);
bPause.setVisibility(View.GONE);
}
});
bStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
mp.stop();
position = 0;
bPlay.setVisibility(View.VISIBLE);
bPause.setVisibility(View.GONE);
}
});
}
}
感谢NIK ,但没有这样的方法在android中显示。 – Jayesh
试试这个mp.isPlaying()== true。 –
我曾试过,但它不工作,它给出了相同的结果。 – Jayesh