我是Android开发的新手，正在开发一个我用于工作的应用程序。它需要多个按钮才能发出声音。然而，这比那更复杂。
我设法制作了一个媒体播放器，它将播放声音，暂停，淡入淡出等按钮，为按钮标签提供一个字符串，该字符串作为文件传递给播放器。停止并释放MP后，我可以按下其他按钮并开始播放新声音。我的问题是因为这是我的戏剧表演。我希望能够交叉混合（即一个声音淡出，下一个开始）。第一个想法是我需要为每个按钮使用不同的MP（这将使用大量的复制代码），而且我希望能够设置近100个按钮。
之前是否有人这样做过，我已经在网上搜索了几个小时以找到很少的帮助。任何帮助都会有用，提前谢谢。
我的代码在
下面 import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.media.MediaPlayer;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
import android.widget.Button;
import android.widget.TextView;
import android.view.View.OnLongClickListener;
import android.util.Log;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends Activity {
MediaPlayer mp, mp2 ;
Button Sound1 ,Sound2, Stop, Pause , Fade;
TextView displaystatus;
String bName = "button pressed";
//set variables for volume control
private int iVolume;
private final static int INT_VOLUME_MAX = 100;
private final static int INT_VOLUME_MIN = 0;
private final static float FLOAT_VOLUME_MAX = 1;
private final static float FLOAT_VOLUME_MIN = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//connect interface to local variables
Fade=(Button)findViewById(R.id.bfade);
Sound1 = (Button)findViewById(R.id.bSound1);
Sound2 = (Button)findViewById(R.id.bSound2);
Stop =(Button)findViewById(R.id.bStop); Pause=(Button)findViewById(R.id.bPause);
displaystatus=(TextView)findViewById(R.id.tStatus);
mp2=new MediaPlayer();
//Button clicks to make play/pause/stop
Sound1.setOnClickListener(buttonPlayOnClickListener);
Sound2.setOnClickListener(buttonPlayOnClickListener);
Pause.setOnClickListener(buttonPauseOnClickListener);
Stop.setOnClickListener( buttonQuitOnClickListener);
Fade.setOnClickListener( buttonFadeOnClickListener);
//set onlongclicklistener to open SoundDetailActivity
Sound1.setOnLongClickListener(new View.OnLongClickListener(){
public boolean onLongClick(View v) {
//get the tag for the button pressed
bName= v.getTag().toString();
whenLongClick();
return true;
};
});
//set long click listener to open SoundDetailActivity
Sound2.setOnLongClickListener(new View.OnLongClickListener(){
public boolean onLongClick(View v) {
//get the tag for the button pressed
bName= v.getTag().toString();
whenLongClick();
return true;
};
});
}
private void initMediaPlayer ()
{
if(mp!=null){mp.stop();
mp.release();}
mp = new MediaPlayer();
File path=android.os.Environment.getExternalStorageDirectory();
try {
Log.v("paddy",path+bName);
mp.setDataSource(path+bName );
mp.prepare();
}catch (IOException e){
e.printStackTrace();
}
}
Button.OnClickListener buttonPlayOnClickListener
= new Button.OnClickListener(){
@Override
public void onClick(View v) {
bName= v.getTag().toString();
initMediaPlayer();
Log.v("paddy",bName);
// if(mp.isPlaying()) {mp.reset();}
mp.start();
displaystatus.setText("- PLAYING -");
Pause.setText("Pause");
Log.v("paddy","no sound was playing");
}
};
Button.OnClickListener buttonPauseOnClickListener
= new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(mp.isPlaying()) {
mp.pause();
displaystatus.setText("- resume -");
Pause.setText("Resume");
}else{
mp.start();
displaystatus.setText("- playing -");
Pause.setText("Pause");
}
//finish();
}
};
Button.OnClickListener buttonQuitOnClickListener
= new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mp.stop();
mp.reset();
displaystatus.setText("- Ready -");
}
};
public Button.OnClickListener buttonFadeOnClickListener
=new Button.OnClickListener(){
@Override
public void onClick(View v) {
fade(5000); ///time in milliseconds
// TODO Auto-generated method stub
// mp.stop();
displaystatus.setText("- Fade out -");
//finish();
}
};
public void fade(int fadeDuration)
{
//Set current volume, depending on fade or not
if (fadeDuration > 0)
iVolume = INT_VOLUME_MAX;
else
iVolume = INT_VOLUME_MIN;
updateVolume(0);
//Start increasing volume in increments
if(fadeDuration > 0)
{
final Timer timer = new Timer(true);
TimerTask timerTask = new TimerTask()
{
public void run() {
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
updateVolume(-1);
if (iVolume <= INT_VOLUME_MIN) {
timer.cancel();
timer.purge();
//Pause music
if (mp.isPlaying()) mp.stop();
mp.release();
mp = new MediaPlayer();
mp = MediaPlayer.create(MainActivity.this, R.raw.franksinatra);
displaystatus.setText("- Ready -");
Log.v("paddy","getting to end of fade");
}
}
});
}
};
// calculate delay, cannot be zero, set to 1 if zero
int delay = fadeDuration/INT_VOLUME_MAX;
if (delay == 0) delay = 1;
timer.schedule(timerTask, delay, delay);
}
}
// when a button is longclicked the activity sound details is opened and the sound button tag is sent as an extra.
public void whenLongClick () {
Toast.makeText(getApplicationContext(), bName , Toast.LENGTH_LONG).show();
Intent i = new Intent(this,SoundDetailActivity.class);
i.putExtra("ButtonId",bName);
startActivity(i);
}
private void updateVolume(int change)
{
//increment or decrement depending on type of fade
iVolume = iVolume + change;
//ensure iVolume within boundaries
if (iVolume < INT_VOLUME_MIN)
iVolume = INT_VOLUME_MIN;
else if (iVolume > INT_VOLUME_MAX)
iVolume = INT_VOLUME_MAX;
//convert to float value
float fVolume = 1 - ((float) Math.log(INT_VOLUME_MAX - iVolume) / (float) Math.log(INT_VOLUME_MAX));
//ensure fVolume within boundaries
if (fVolume < FLOAT_VOLUME_MIN)
fVolume = FLOAT_VOLUME_MIN;
else if (fVolume > FLOAT_VOLUME_MAX)
fVolume = FLOAT_VOLUME_MAX;
mp.setVolume(fVolume, fVolume);
}
}