我已经制作了一个能够生成音调并播放它的Android应用程序，它在我的模拟器上工作正常，但在我的实际设备上，大约一分钟后，它会停止工作＆＃34; 。任何想法为什么？ 这是几乎所有事情发生的类：
package com.funguscow;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.os.Bundle;
import android.os.Handler;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
public class Afspl extends Activity {
public DrawView vi;
private Point size;
Display disp;
public int wide, high, cx, cy;
boolean doPlay = false;
Thread soundPlayer;
int note = 0;
int lastNote = note;
boolean changed = false;
int countTick = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
disp = getWindowManager().getDefaultDisplay();
try{
disp.getSize(size);
wide = size.x;
high = size.y;
}catch(Exception e){
wide = disp.getWidth();
high = disp.getHeight();
}
cx = 0; //tracks mouse x
cy = 0; //tracks mouse y
vi = new DrawView(getApplicationContext());
setContentView(vi);
soundPlayer = new Thread(new Runnable(){
public void run(){
int count = 0;
while(true){
try{
Thread.sleep((long)(duration * 10));
}catch(Exception e){}
//if(++countTick>)
if(!doPlay){
if(count==1 && track.getState()==AudioTrack.STATE_INITIALIZED)track.stop();
continue;
}
lastNote = note;
note = cy * 12 / high;
changed = (lastNote!=note);
if(cx > wide/2)note+=12;
int freq = (int)(440 * Math.pow(1.059463, note));
genTone(freq);
if(count==0){
handler.post(new Runnable(){
public void run(){
playSound();
}
});
count++;
}else{
handler.post(new Runnable(){
public void run(){
if(++countTick >= 10){
countTick = 0;
return;
}
track.release();
playSound();
}
});
}
}
}
});
soundPlayer.start();
}
private int waveType = 0;
class DrawView extends View{
Paint paint = new Paint();
public DrawView(Context context){
super(context);
}
public void onDraw(Canvas c){
int red = 256;
int green = 0;
int blue = 0;
int curInc = 0;
for(int i=0; i<24; i++){
if(curInc==0){
green += 256/2;
if(green>=256){
curInc = 1;
}
}
else if(curInc == 1){
red -= 256/2;
if(red<=0){
curInc = 2;
}
}
else if(curInc == 2){
blue += 256/2;
if(blue >= 256){
curInc = 3;
}
}
else if(curInc == 3){
green -= 256/2;
if(green<=0){
curInc = 4;
}
}
else if(curInc == 4){
red += 256/2;
if(red>=256){
curInc = 5;
}
}else if(curInc == 5){
blue -= 256/2;
if(blue<=0){
curInc=0;
}
}
int width = wide;
int start = 0;
if(i<12){
width/=2;
}
else{
start = width/2;
red = 256-red;
green = 256-green;
blue = 256-blue;
}
paint.setColor(getColor(red, blue, green));
int height = high / 12;
int starty = i * height;
int endy = (i+1) * height;
if(i>=12){
starty = (i-12) * height;
endy = (i-11) * height;
}
c.drawRect(start, starty, width, endy, paint);
}
paint.setColor(Color.WHITE);
c.drawRect((wide * 11)/12, (high*11)/12, wide, high, paint);
}
public int getColor(int r, int g, int b){
int red = (r << 16) & 0x00ff0000;
int green = (g << 8) & 0x0000ff00;
int blue = b & 0x000000ff;
return 0xff000000 | red | green | blue;
}
}
public boolean onTouchEvent(MotionEvent me){
int type = me.getActionMasked();
switch(type){
case MotionEvent.ACTION_DOWN:
cx = (int)me.getX();
cy = (int)me.getY();
doPlay = true;
return true;
case MotionEvent.ACTION_UP:
doPlay = false;
if(cx > (wide * 11)/12 && cy > (high * 11)/12){
if(++waveType>3)waveType=0;
}
return true;
case MotionEvent.ACTION_MOVE:
cx = (int)me.getX();
cy = (int)me.getY();
return true;
default:
return super.onTouchEvent(me);
}
}
public double duration = 1;
public int sampleRate = 8000;
public int numSamples = (int)duration * sampleRate;
public final double[] samples = new double[numSamples];
public final byte[] generatedSnd = new byte[numSamples * 2];
public Handler handler = new Handler();
AudioTrack track;
public void genTone(int freq){
float period = (float)sampleRate / (float)freq;
for(int i = 0; i<numSamples; i++){
switch(waveType){
case 0:
samples[i] = Math.sin(2 * i * Math.PI / period);
break;
case 1:
samples[i] = (int)(i/period) % 2 == 0 ? -1 : 1;
break;
case 2:
samples[i] = (i % period)/period;
break;
default:
samples[i] = ( 2 * Math.asin(Math.sin(2 * Math.PI * i / period)) / Math.PI);
}
}
int idx = 0;
int efcx = cx;
if(cx>wide/2)efcx = wide-cx;
int volume = 32767 * 2 * efcx/wide;
for (final double dVal : samples) {
final short val = (short) ((dVal) * volume);
generatedSnd[idx++] = (byte) (val & 0x00ff);
generatedSnd[idx++] = (byte) ((val & 0xff00) >>> 8);
}
}
public void playSound(){
track = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, generatedSnd.length, AudioTrack.MODE_STATIC);
track.write(generatedSnd, 0, generatedSnd.length);
track.play();
}
}
那么......如果没有＆＃34;停止工作＆＃34 ;?我怎样才能使这个应用程序正常运行？这堂课有什么我应该改变的吗？如果你有答案，请不要含糊，告诉我编码问题以及如何解决它。谢谢。
答案 0 :(得分：0)
我必须检查track.getState（）是不是STATE_UNINITIALIZED，并且在调用stop（）之前track.getPlayState（）不是PLAYSTATE_STOPPED。