Java 按照教程，应用程序已停止工作

嘿，我在听一个关于soundpool的教程

但这样做之后，我的应用程序无法运行，并显示“不幸的是，应用程序名称已停止”

需要帮助，对android、eclipse和编码都是全新的

Main.java

package com.example.touchscreenexperiment;

import java.util.HashMap;

import android.app.Activity;
import android.content.Context;
import android.media.AudioManager;
import android.media.SoundPool;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Main extends Activity implements OnClickListener{
private SoundPool mSoundPool;
private AudioManager  mAudioManager;
private HashMap<Integer, Integer> mSoundPoolMap;
private int mStream1 = 0;
private int mStream2 = 0;
final static int LOOP_1_TIME = 0;
final static int LOOP_3_TIMES = 2;
final static int SOUND_FX_01 = 1;
final static int SOUND_FX_02 = 2;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//set up our audio player
mSoundPool = new SoundPool(2, AudioManager.STREAM_MUSIC, 0);
mAudioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
mSoundPoolMap = new HashMap();
//load fx
mSoundPoolMap.put(SOUND_FX_01, mSoundPool.load(this, R.raw.set_trap, 1));
mSoundPoolMap.put(SOUND_FX_02, mSoundPool.load(this, R.raw.spring_trap, 1));
//wire buttons
Button b = (Button)findViewById(R.id.fx01);
b.setOnClickListener(this);
b = (Button)findViewById(R.id.fx02);
b.setOnClickListener(this);
b = (Button)findViewById(R.id.stop);
b.setOnClickListener(this);
}

@Override
public void onClick(View v) {
float streamVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
streamVolume = streamVolume / mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
switch (v.getId()) {
case R.id.fx01:
mSoundPool.stop(mStream1);
mStream1= mSoundPool.play(mSoundPoolMap.get(SOUND_FX_01), streamVolume, streamVolume, 1, LOOP_1_TIME, 1f);
break;
case R.id.fx02:
mSoundPool.stop(mStream2);
mStream2= mSoundPool.play(mSoundPoolMap.get(SOUND_FX_02), streamVolume, streamVolume, 1, LOOP_3_TIMES, 1f);
break;
case R.id.stop:
mSoundPool.stop(mStream1);
mSoundPool.stop(mStream2);
break;
}
}
}

---

非常感谢您查看您的舱单。我相信，您在清单中将活动声明为

.MainActivity

，但您的类只是

Main

编辑：具体地说，在您的AndroidManifest.xml文件中，您将有如下内容：

<activity
    android:name=".MainActivity"
    android:label="@string/app_title">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

---

注意

android:name=“.MainActivity”

行。这告诉应用程序类名是

MainActivity

。在您的情况下，类名是

Main

，因此该行需要更改为

android:name=“.Main”

，您应该没事。

请发布您的日志。感谢您指出这一点！我忘了，你能指出我应该改成什么吗？对不起，我对这件事还不太熟悉

05-30 20:01:41.560: D/AndroidRuntime(24402): Shutting down VM
05-30 20:01:41.560: W/dalvikvm(24402): threadid=1: thread exiting with uncaught exception (group=0x40be4930)
05-30 20:01:41.560: E/AndroidRuntime(24402): FATAL EXCEPTION: main
05-30 20:01:41.560: E/AndroidRuntime(24402): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.touchscreenexperiment/com.example.touchscreenexperiment.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.example.touchscreenexperiment.MainActivity" on path: /data/app/com.example.touchscreenexperiment-2.apk
05-30 20:01:41.560: E/AndroidRuntime(24402):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at android.os.Looper.loop(Looper.java:137)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at android.app.ActivityThread.main(ActivityThread.java:5041)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at java.lang.reflect.Method.invokeNative(Native Method)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at java.lang.reflect.Method.invoke(Method.java:511)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at dalvik.system.NativeStart.main(Native Method)
05-30 20:01:41.560: E/AndroidRuntime(24402): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.touchscreenexperiment.MainActivity" on path: /data/app/com.example.touchscreenexperiment-2.apk
05-30 20:01:41.560: E/AndroidRuntime(24402):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
05-30 20:01:41.560: E/AndroidRuntime(24402):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
05-30 20:01:41.560: E/AndroidRuntime(24402):    ... 11 more

<activity
    android:name=".MainActivity"
    android:label="@string/app_title">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>