由于空指针异常，在活动设置期间强制关闭。
错误日志：
08-02 12:50:33.913: E/main(383): Birds clicked on - new activity starting....id
08-02 12:55:22.977: D/AndroidRuntime(383): Shutting down VM
08-02 12:55:22.977: W/dalvikvm(383): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-02 12:55:23.104: E/AndroidRuntime(383): FATAL EXCEPTION: main
08-02 12:55:23.104: E/AndroidRuntime(383): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.kissta.safari/com.kissta.safari.viewscreen}: java.lang.NullPointerException
08-02 12:55:23.104: E/AndroidRuntime(383): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
08-02 12:55:23.104: E/AndroidRuntime(383): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
08-02 12:55:23.104: E/AndroidRuntime(383): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-02 12:55:23.104: E/AndroidRuntime(383): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
08-02 12:55:23.104: E/AndroidRuntime(383): at android.os.Handler.dispatchMessage(Handler.java:99)
08-02 12:55:23.104: E/AndroidRuntime(383): at android.os.Looper.loop(Looper.java:130)
08-02 12:55:23.104: E/AndroidRuntime(383): at android.app.ActivityThread.main(ActivityThread.java:3683)
08-02 12:55:23.104: E/AndroidRuntime(383): at java.lang.reflect.Method.invokeNative(Native Method)
08-02 12:55:23.104: E/AndroidRuntime(383): at java.lang.reflect.Method.invoke(Method.java:507)
08-02 12:55:23.104: E/AndroidRuntime(383): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-02 12:55:23.104: E/AndroidRuntime(383): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-02 12:55:23.104: E/AndroidRuntime(383): at dalvik.system.NativeStart.main(Native Method)
08-02 12:55:23.104: E/AndroidRuntime(383): Caused by: java.lang.NullPointerException
08-02 12:55:23.104: E/AndroidRuntime(383): at android.app.Activity.findViewById(Activity.java:1647)
08-02 12:55:23.104: E/AndroidRuntime(383): at com.kissta.safari.viewscreen.<init>(viewscreen.java:125)
08-02 12:55:23.104: E/AndroidRuntime(383): at java.lang.Class.newInstanceImpl(Native Method)
08-02 12:55:23.104: E/AndroidRuntime(383): at java.lang.Class.newInstance(Class.java:1409)
08-02 12:55:23.104: E/AndroidRuntime(383): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
08-02 12:55:23.104: E/AndroidRuntime(383): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
08-02 12:55:23.104: E/AndroidRuntime(383): ... 11 more
根据日志命令，我的应用程序在打开 viewscreen 或 viewxml 时似乎失败了：
// ...abridged...import android.widget.ImageButton;
public class main extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainxml);
// ... abridged
ImageButton ibone = (ImageButton) findViewById(R.id.imageButton1);
ibone.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent explicitIntent1 = new Intent(main.this,viewscreen.class);
explicitIntent1.putExtra("id", 1);
startActivity(explicitIntent1);
Log.e("main", "Birds clicked on - new activity starting...." + "id");
}
});
....further abridged...
显现：
<uses-sdk
android:minSdkVersion="8"/>
<application
android:icon="@drawable/iconanimal"
android:label="@string/app_name"
android:screenOrientation="landscape"
android:theme="@style/Theme.Transparent" >
<activity
android:name=".splash"
android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".main"
android:label="@string/app_name"
android:screenOrientation="landscape" >
</activity>
<activity
android:name=".viewscreen"
android:label="@string/app_name"
android:screenOrientation="landscape" >
</activity>
</application>
</manifest>
在视屏活动中：
package com.kissta.safari;
import java.util.ArrayList;
import android.app.Activity;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.ViewSwitcher;
public class viewscreen extends Activity implements OnClickListener,
OnGestureListener {
// references to our image
private animals animalclass = new animals();
int TotalAnimals; // starting from 0 of course (so an 11=12 fruit)
int currentAnimal = 0;
boolean active = true;
long starttime = System.currentTimeMillis();
long timedelay = 50;
ArrayList<Integer> imagearray = new ArrayList<Integer>();
ArrayList<Integer> soundarray = new ArrayList<Integer>();
// ArrayList<String> printarray = new ArrayList<String>();
private ViewSwitcher switcher;
private GestureDetector gesturedetector;
public boolean viewone = true;
public int menuoption;
Handler myHandler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.e("viewscreen1", "xml loading"); // does not reach here
setContentView(R.layout.viewxml);
永远不会触发上面的日志消息，这意味着永远不会到达 viewxml.xml（？？？）。
这是 viewxml.xml：
`<?xml version="1.0" encoding="utf-8"?>
<!-- Note: Can't add more than 2 views to a ViewSwitcher -->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fullscreenrelative"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_gravity="center_horizontal"
>
<ViewSwitcher
android:id="@+id/viewSwitcher"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/bottomtablerow"
android:layout_centerHorizontal="true"
android:layout_gravity="center_horizontal|top"
android:inAnimation="@anim/in_animation"
android:outAnimation="@anim/out_animation" >
<RelativeLayout
android:id="@+id/view1relative"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center_horizontal"
android:background="@drawable/swan"
android:gravity="center_horizontal" >
<ImageView
android:id="@+id/view1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/clear32" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/view2relative"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center_horizontal"
android:background="@drawable/kangaroo" >
<ImageView
android:id="@+id/view2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/clear32" />
</RelativeLayout>
</ViewSwitcher>
<TableRow
android:id="@+id/bottomtablerow"
android:layout_width="fill_parent"
android:layout_height="48dp"
android:layout_alignParentBottom="true"
android:background="#303030"
android:gravity="center_horizontal" >
<ImageButton
android:id="@+id/btnPrevious"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left|center_vertical"
android:layout_weight=".2"
android:background="@drawable/whiteleft"
android:textStyle="bold" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight=".1"
android:src="@drawable/clear" />
<TextView
android:id="@+id/textll"
android:layout_width="wrap_content"
android:layout_height="44dp"
android:layout_gravity="center_horizontal|top"
android:layout_weight="1"
android:gravity="center"
android:includeFontPadding="false"
android:padding="10dip"
android:text="@string/app_name"
android:textColor="#FFFFFF"
android:textSize="25sp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight=".1"
android:src="@drawable/clear" />
<ImageButton
android:id="@+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|center_vertical"
android:layout_weight=".2"
android:background="@drawable/whiteright"
android:textStyle="bold" />
</TableRow>
</RelativeLayout>`
PS 我现在也收到一个可能无关的 AVD 错误：“模拟器：错误：无法加载 OpenGLES 仿真库：无法加载 DLL！” 不过，我根本不相信我在使用 OpenGL。请参阅http://code.google.com/p/android/issues/detail?id=33336上的常见错误报告
PSS 我的应用程序也拒绝使用非谷歌 api 虚拟机
PSS 这里是所要求的完整主文件：package com.kissta.safari；
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
public class main extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainxml);
// android:tileMode="repeat"
Log.e("main", "main all good");
SoundManager.getInstance();
SoundManager.initSounds(main.this);
SoundManager.loadSounds();
Log.e("main", "sm LoadSounds worked, all done.");
// SECTION FOR GAME CHOICE BUTTONS!!!!!!!!!
// ***
ImageButton ibone = (ImageButton) findViewById(R.id.imageButton1);
ibone.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent explicitIntent1 = new Intent(main.this,viewscreen.class);
explicitIntent1.putExtra("id", 1);
startActivity(explicitIntent1);
Log.e("main", "Birds clicked on - new activity starting...." + "id"); // it gets this far perfectly fine
}
});
// ***
ImageButton ibtwo = (ImageButton) findViewById(R.id.imageButton2);
ibtwo.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Playsound2.stop();
Intent explicitIntent2 = new Intent(main.this,
viewscreen.class);
explicitIntent2.putExtra("id", 2);
startActivity(explicitIntent2);
}
});
// ***
ImageButton ibthree = (ImageButton) findViewById(R.id.imageButton3);
ibthree.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Playsound2.stop();
Intent explicitIntent3 = new Intent(main.this,
viewscreen.class);
explicitIntent3.putExtra("id", 3);
startActivity(explicitIntent3);
}
});
// ***
ImageButton ibfour = (ImageButton) findViewById(R.id.imageButton4);
ibfour.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Playsound2.stop();
Intent explicitIntent4 = new Intent(main.this,
viewscreen.class);
explicitIntent4.putExtra("id", 4);
startActivity(explicitIntent4);
}
});
ImageButton ibfive = (ImageButton) findViewById(R.id.imageButton5);
ibfive.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Playsound2.stop();
Intent explicitIntent5 = new Intent(main.this,
viewscreen.class);
explicitIntent5.putExtra("id", 5);
startActivity(explicitIntent5);
}
});
ImageButton ibsix = (ImageButton) findViewById(R.id.imageButton6); // settings - adjust
ibsix.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Playsound2.stop();
Intent explicitIntent6 = new Intent(main.this,
viewscreen.class);
explicitIntent6.putExtra("id", 6);
startActivity(explicitIntent6);
}
});
ImageButton ibsev = (ImageButton) findViewById(R.id.imageButtonau); // settings - adjust
ibsev.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Playsound2.stop();
Intent explicitIntent6 = new Intent(main.this,
viewscreen.class);
explicitIntent6.putExtra("id", 7);
startActivity(explicitIntent6);
}
});
// / *************** END OF GAME CHOICE BUTTONS
}
}