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想用另一个项目中的按钮启动一个独立的 android 项目。首先制作了一个简单的主应用程序，该应用程序带有一个按钮，该按钮使用 Hello World 引用另一个项目，其中“is Library in Preferences”。所有根据http://developer.android.com/tools/projects/projects-eclipse.html#SettingUpLibraryProject并且它工作没有问题。

对开源项目（拼图）做了同样的事情http://code.google.com/p/androidsoft/source/browse/#svn%2Ftrunk%2Fpuzzle但在 LogCat 中收到错误消息，当我单击时我的应用程序崩溃我的主应用程序中的按钮。

我猜我可能错过了 AndroidManifest.xml 中的某些内容根据它说的文档

Declaring library components in the manifest file: You must declare any <activity>, <service>, <receiver>, <provider>, and so on, as well as <permission>, <uses-library>.

我可以毫无问题地将拼图编译为自己的项目。如果拼图是一个库将无法工作。

我的主应用程序带有一个将启动第二个项目的按钮

public class AppActivity extends Activity {

    Button button;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        addListenerOnButton();
    }

    public void addListenerOnButton() {

        final Context context = this;

        button = (Button) findViewById(R.id.button1);

        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

                Intent intent = new Intent(context, org.androidsoft.games.puzzle.kids.MainActivity.class);
                startActivity(intent);   

            }

        });

    }

}

AndroidManifest.xml 在我的主应用程序中使用 android:name="org.androidsoft.games.puzzle.kids.MainActivity

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mkyong.android"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".AppActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
           android:name="org.androidsoft.games.puzzle.kids.MainActivity">
        </activity>
        </application>

</manifest>

我想用作库的拼图中的 AndroidManifest.xml http://code.google.com/p/androidsoft/source/browse/trunk/puzzle/AndroidManifest.xml

LogCat 错误

08-08 12:44:31.607: E/AndroidRuntime(780): FATAL EXCEPTION: main
08-08 12:44:31.607: E/AndroidRuntime(780): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mkyong.android/org.androidsoft.games.puzzle.kids.MainActivity}: java.lang.NullPointerException
08-08 12:44:31.607: E/AndroidRuntime(780):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
08-08 12:44:31.607: E/AndroidRuntime(780):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
08-08 12:44:31.607: E/AndroidRuntime(780):  at android.app.ActivityThread.access$600(ActivityThread.java:130)
08-08 12:44:31.607: E/AndroidRuntime(780):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
08-08 12:44:31.607: E/AndroidRuntime(780):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-08 12:44:31.607: E/AndroidRuntime(780):  at android.os.Looper.loop(Looper.java:137)
08-08 12:44:31.607: E/AndroidRuntime(780):  at android.app.ActivityThread.main(ActivityThread.java:4745)
08-08 12:44:31.607: E/AndroidRuntime(780):  at java.lang.reflect.Method.invokeNative(Native Method)
08-08 12:44:31.607: E/AndroidRuntime(780):  at java.lang.reflect.Method.invoke(Method.java:511)
08-08 12:44:31.607: E/AndroidRuntime(780):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-08 12:44:31.607: E/AndroidRuntime(780):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-08 12:44:31.607: E/AndroidRuntime(780):  at dalvik.system.NativeStart.main(Native Method)
08-08 12:44:31.607: E/AndroidRuntime(780): Caused by: java.lang.NullPointerException
08-08 12:44:31.607: E/AndroidRuntime(780):  at org.androidsoft.games.puzzle.kids.AbstractMainActivity.onCreate(AbstractMainActivity.java:81)
08-08 12:44:31.607: E/AndroidRuntime(780):  at org.androidsoft.games.puzzle.kids.MainActivity.onCreate(MainActivity.java:57)
08-08 12:44:31.607: E/AndroidRuntime(780):  at android.app.Activity.performCreate(Activity.java:5008)
08-08 12:44:31.607: E/AndroidRuntime(780):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
08-08 12:44:31.607: E/AndroidRuntime(780):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
08-08 12:44:31.607: E/AndroidRuntime(780):  ... 11 more
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