当用户点击按钮时，我正在尝试创建一个播放随机声音的简单应用。该应用程序启动没有问题，它会在崩溃之前发出随机数量的声音。我找不到任何类似的问题/问题，这就是我发布这个问题的原因。
这是我的日志：
08-09 10:10:16.706: D/dalvikvm(265): GC freed 571 objects / 49008 bytes in 128ms
08-09 10:10:18.896: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:19.036: I/MediaPlayer(265): Info (1,44)
08-09 10:10:19.036: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:19.036: I/MediaPlayer(265): Info (1,44)
08-09 10:10:19.236: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:19.336: I/MediaPlayer(265): Info (1,44)
08-09 10:10:19.346: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:19.346: I/MediaPlayer(265): Info (1,44)
08-09 10:10:19.746: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:19.856: I/MediaPlayer(265): Info (1,44)
08-09 10:10:20.016: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:20.166: I/MediaPlayer(265): Info (1,44)
08-09 10:10:20.166: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:20.166: I/MediaPlayer(265): Info (1,44)
08-09 10:10:20.396: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:20.556: I/MediaPlayer(265): Info (1,44)
08-09 10:10:20.566: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:20.566: I/MediaPlayer(265): Info (1,44)
08-09 10:10:20.766: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:20.907: I/MediaPlayer(265): Info (1,44)
08-09 10:10:20.907: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:20.916: I/MediaPlayer(265): Info (1,44)
08-09 10:10:21.116: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:21.236: I/MediaPlayer(265): Info (1,44)
08-09 10:10:21.246: W/MediaPlayer(265): info/warning (1, 44)
08-09 10:10:21.246: I/MediaPlayer(265): Info (1,44)
08-09 10:10:21.406: W/MediaPlayer(265): info/warning (1, 26)
08-09 10:10:21.427: E/MediaPlayer(265): error (1, -17)
08-09 10:10:21.447: D/MediaPlayer(265): create failed:
08-09 10:10:21.447: D/MediaPlayer(265): java.io.IOException: Prepare failed.: status=0x1
08-09 10:10:21.447: D/MediaPlayer(265): at android.media.MediaPlayer.prepare(Native Method)
08-09 10:10:21.447: D/MediaPlayer(265): at android.media.MediaPlayer.create(MediaPlayer.java:644)
08-09 10:10:21.447: D/MediaPlayer(265): at com.moer.playsound.MainActivity$1.onClick(MainActivity.java:40)
08-09 10:10:21.447: D/MediaPlayer(265): at android.view.View.performClick(View.java:2364)
08-09 10:10:21.447: D/MediaPlayer(265): at android.view.View.onTouchEvent(View.java:4179)
08-09 10:10:21.447: D/MediaPlayer(265): at android.widget.TextView.onTouchEvent(TextView.java:6541)
08-09 10:10:21.447: D/MediaPlayer(265): at android.view.View.dispatchTouchEvent(View.java:3709)
08-09 10:10:21.447: D/MediaPlayer(265): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-09 10:10:21.447: D/MediaPlayer(265): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-09 10:10:21.447: D/MediaPlayer(265): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-09 10:10:21.447: D/MediaPlayer(265): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-09 10:10:21.447: D/MediaPlayer(265): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.j ava:1659)
08-09 10:10:21.447: D/MediaPlayer(265): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
08-09 10:10:21.447: D/MediaPlayer(265): at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
08-09 10:10:21.447: D/MediaPlayer(265): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1 643)
08-09 10:10:21.447: D/MediaPlayer(265): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
08-09 10:10:21.447: D/MediaPlayer(265): at android.os.Handler.dispatchMessage(Handler.java:99)
08-09 10:10:21.447: D/MediaPlayer(265): at android.os.Looper.loop(Looper.java:123)
08-09 10:10:21.447: D/MediaPlayer(265): at android.app.ActivityThread.main(ActivityThread.java:4363)
08-09 10:10:21.447: D/MediaPlayer(265): at java.lang.reflect.Method.invokeNative(Native Method)
08-09 10:10:21.447: D/MediaPlayer(265): at java.lang.reflect.Method.invoke(Method.java:521)
08-09 10:10:21.447: D/MediaPlayer(265): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-09 10:10:21.447: D/MediaPlayer(265): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-09 10:10:21.447: D/MediaPlayer(265): at dalvik.system.NativeStart.main(Native Method)
08-09 10:10:21.466: D/AndroidRuntime(265): Shutting down VM
08-09 10:10:21.466: W/dalvikvm(265): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
08-09 10:10:21.476: E/AndroidRuntime(265): Uncaught handler: thread main exiting due to uncaught exception
08-09 10:10:21.496: E/AndroidRuntime(265): java.lang.NullPointerException
08-09 10:10:21.496: E/AndroidRuntime(265): at com.moer.playsound.MainActivity$1.onClick(MainActivity.java:41)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.view.View.performClick(View.java:2364)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.view.View.onTouchEvent(View.java:4179)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.widget.TextView.onTouchEvent(TextView.java:6541)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.view.View.dispatchTouchEvent(View.java:3709)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-09 10:10:21.496: E/AndroidRuntime(265): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
08-09 10:10:21.496: E/AndroidRuntime(265): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
08-09 10:10:21.496: E/AndroidRuntime(265): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.os.Handler.dispatchMessage(Handler.java:99)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.os.Looper.loop(Looper.java:123)
08-09 10:10:21.496: E/AndroidRuntime(265): at android.app.ActivityThread.main(ActivityThread.java:4363)
08-09 10:10:21.496: E/AndroidRuntime(265): at java.lang.reflect.Method.invokeNative(Native Method)
08-09 10:10:21.496: E/AndroidRuntime(265): at java.lang.reflect.Method.invoke(Method.java:521)
08-09 10:10:21.496: E/AndroidRuntime(265): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-09 10:10:21.496: E/AndroidRuntime(265): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-09 10:10:21.496: E/AndroidRuntime(265): at dalvik.system.NativeStart.main(Native Method)
08-09 10:10:21.516: I/dalvikvm(265): threadid=7: reacting to signal 3
08-09 10:10:21.726: I/dalvikvm(265): Wrote stack trace to '/data/anr/traces.txt'
08-09 10:10:34.156: I/Process(265): Sending signal. PID: 265 SIG: 9
这是代码：
package com.moer.playsound;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import java.util.Random;
import android.view.KeyEvent;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
private final int NUM_SOUND_FILES = 8;
private int mfile[] = new int[NUM_SOUND_FILES];
private Random rnd = new Random();
private MediaPlayer mp;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mfile[0] = R.raw.sound1;
mfile[1] = R.raw.sound2;
mfile[2] = R.raw.sound3;
mfile[3] = R.raw.sound4;
mfile[4] = R.raw.sound5;
mfile[5] = R.raw.sound6;
mfile[6] = R.raw.sound7;
mfile[7] = R.raw.sound8;
Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mp = MediaPlayer.create(MainActivity.this, mfile[rnd.nextInt(NUM_SOUND_FILES)]);
mp.seekTo(0);
mp.start();
}});
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
finish();
return true;
}
return false;
}
}
我尝试使用wav格式并减少使用的文件数量，但它没有做任何事情。我是新手，所以任何帮助都将不胜感激。
谢谢
答案 0 :(得分：1)
嗨试试这个，
import java.util.Random;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final int[] SOUNDS = new int[] { R.raw.sound1, R.raw.sound2,
R.raw.sound3, R.raw.sound4, R.raw.sound5, R.raw.sound6,
R.raw.sound7, R.raw.sound8 };
// private int mfile[] = new int[NUM_SOUND_FILES];
private Random rnd = new Random();
private MediaPlayer mp;
int flag = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if (flag == 0) {
Log.v("Flag Values is", flag + "");
audioPlaying();
} else {
Toast.makeText(getApplicationContext(),
"player is currently Playing", Toast.LENGTH_LONG)
.show();
mp.stop();
mp.release();
flag = 0;
audioPlaying();
}
}
});
// Button button2 = (Button) findViewById(R.id.button2);
// button2.setOnClickListener(new OnClickListener() {
// public void onClick(View v) {
//
// mp.stop();
// mp.release();
//
// }
// });
}
protected void audioPlaying() {
// TODO Auto-generated method stub
int sndToPlay = rnd.nextInt(SOUNDS.length);
mp = MediaPlayer.create(MainActivity.this, SOUNDS[sndToPlay]);
mp.seekTo(0);
mp.start();
flag++;
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
finish();
return true;
}
return false;
}
@Override
protected void onStop() {
super.onStop();
// deallocate all memory
if (mp != null) {
if (mp.isPlaying()) {
mp.stop();
}
mp.release();
mp = null;
}
}
}
答案 1 :(得分：-2)
第41行代码的哪一部分为空？