我是安卓新手。当我运行我的应用程序时，它在横向模式下运行良好，但在纵向模式下，应用程序被强制关闭，在日志中显示以下内容
05-31 16:48:30.958: W/KeyCharacterMap(428): No keyboard for id 0
05-31 16:48:30.958: W/KeyCharacterMap(428): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
05-31 16:50:45.728: D/AndroidRuntime(484): Shutting down VM
05-31 16:50:45.728: W/dalvikvm(484): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
05-31 16:50:45.758: E/AndroidRuntime(484): FATAL EXCEPTION: main
05-31 16:50:45.758: E/AndroidRuntime(484): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kalmas/com.kalmas.Kalma2}: java.lang.NullPointerException
05-31 16:50:45.758: E/AndroidRuntime(484): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
05-31 16:50:45.758: E/AndroidRuntime(484): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
05-31 16:50:45.758: E/AndroidRuntime(484): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
05-31 16:50:45.758: E/AndroidRuntime(484): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
05-31 16:50:45.758: E/AndroidRuntime(484): at android.os.Handler.dispatchMessage(Handler.java:99)
05-31 16:50:45.758: E/AndroidRuntime(484): at android.os.Looper.loop(Looper.java:123)
05-31 16:50:45.758: E/AndroidRuntime(484): at android.app.ActivityThread.main(ActivityThread.java:4627)
05-31 16:50:45.758: E/AndroidRuntime(484): at java.lang.reflect.Method.invokeNative(Native Method)
05-31 16:50:45.758: E/AndroidRuntime(484): at java.lang.reflect.Method.invoke(Method.java:521)
05-31 16:50:45.758: E/AndroidRuntime(484): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-31 16:50:45.758: E/AndroidRuntime(484): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-31 16:50:45.758: E/AndroidRuntime(484): at dalvik.system.NativeStart.main(Native Method)
05-31 16:50:45.758: E/AndroidRuntime(484): Caused by: java.lang.NullPointerException
05-31 16:50:45.758: E/AndroidRuntime(484): at com.kalmas.Kalma2.onCreate(Kalma2.java:52)
05-31 16:50:45.758: E/AndroidRuntime(484): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-31 16:50:45.758: E/AndroidRuntime(484): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
05-31 16:50:45.758: E/AndroidRuntime(484): ... 11 more
05-31 16:50:48.108: I/Process(484): Sending signal. PID: 484 SIG: 9
我的 Kalma2.java 的代码是
package com.kalmas;
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
public class Kalma2 extends Activity {
public void onCreate(Bundle savedInstanceState) {
final MediaPlayer kalma2 = MediaPlayer.create(this, R.raw.kalma2);
super.onCreate(savedInstanceState);
setContentView(R.layout.kalma2);
ImageView prev2 = (ImageView)findViewById(R.id.prev2);
prev2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
kalma2.stop();
startActivity(new Intent(Kalma2.this,Kalma1.class));
}
});
ImageView next2 = (ImageView)findViewById(R.id.next2);
next2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
kalma2.stop();
startActivity(new Intent(Kalma2.this,Kalma3.class));
}
});
ImageView pause = (ImageView)findViewById(R.id.pause2);
pause.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
kalma2.pause();
}
});
ImageView play = (ImageView)findViewById(R.id.play2);
play.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
kalma2.start();
}
});
ImageView kalma = (ImageView)findViewById(R.id.kalma2);
kalma.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
kalma2.start();
}
});
}
}