Android 如何将定制的Launcher成为系统中唯一的Launcher

   /**
     * This method is called from Zygote to initialize the system. This will cause the native
     * services (SurfaceFlinger, AudioFlinger, etc..) to be started. After that it will call back
     * up into init2() to start the Android services.
     */
    native public static void init1(String[] args);

    public static void main(String[] args) {
        if (SamplingProfilerIntegration.isEnabled()) {
            SamplingProfilerIntegration.start();
            timer = new Timer();
            timer.schedule(new TimerTask() {
                @Override
                public void run() {
                    SamplingProfilerIntegration.writeSnapshot(“system_server”);
                }
            }, SNAPSHOT_INTERVAL, SNAPSHOT_INTERVAL);
        }

        // The system server has to run all of the time, so it needs to be
        // as efficient as possible with its memory usage.
        VMRuntime.getRuntime().setTargetHeapUtilization(0.8f);

        System.loadLibrary(“android_servers”);
        init1(args);
    }

    public static final void init2() {
        Log.i(TAG, “Entered the Android system server!”);
        Thread thr = new ServerThread();
        thr.setName(“android.server.ServerThread”);
        thr.start();
    }

一般情况下我们使用Manifest中定义的<category android:name=”android.intent.category.HOME”来过滤的，我们现在增加一个私有的HOME_FIRST过滤。
     在Intent.java(frameworks/base/core/java/android/content/Intent.java)中添加两行代码
    //lixinso:添加CATEGORY_HOME_FIRST
    @SdkConstant(SdkConstantType.INTENT_CATEGORY)
    public static final String CATEGORY_HOME_FIRST = “android.intent.category.HOME_FIRST”;
3)修改和CATEGORY_HOME相关的所有的地方，都改成HOME_FIRST，主要是framework中的这几个地方：
    frameworks/base/services/java/com/android/server/am/ActivityManagerService.java中
    //intent.addCategory(Intent.CATEGORY_HOME);
    改成intent.addCategory(Intent.CATEGORY_HOME_FIRST); //lixinso:
    //if (r.intent.hasCategory(Intent.CATEGORY_HOME)) {
    改成if (r.intent.hasCategory(Intent.CATEGORY_HOME_FIRST)) { //lixinso: Intent.CATEGORY_HOME -> Intent.CATEGORY_HOME_FIRST
   frameworks/base/services/java/com/android/server/am/HistoryRecorder.java中
   // _intent.hasCategory(Intent.CATEGORY_HOME) &&
   改成 _intent.hasCategory(Intent.CATEGORY_HOME_FIRST) && //lixinso: Intent.CATEGORY_HOME->Intent.CATEGORY_HOME_FIRST
   frameworks/policies/base/mid/com/android/internal/policy/impl/MidWindowManager.java中
   //mHomeIntent.addCategory(Intent.CATEGORY_HOME);
   改成 mHomeIntent.addCategory(Intent.CATEGORY_HOME_FIRST); //lixinso
  frameworks/policies/base/mid/com/android/internal/policy/impl/RecentApplicationsDialog.java中
   //new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME),0);
   改成 new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME_FIRST),0); //lixinso
  frameworks/policies/base/phone/com/android/internal/policy/impl/PhoneWindowManager.java中
   //mHomeIntent.addCategory(Intent.CATEGORY_HOME);
   改成 mHomeIntent.addCategory(Intent.CATEGORY_HOME_FIRST); //lixinso
  frameworks/policies/base/phone/com/android/internal/policy/impl/RecentApplicationsDialog.java中
   //ResolveInfo homeInfo = pm.resolveActivity(new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME),0);

<application  android:process=”android.process.acore3″ android:icon=”@drawable/icon” android:label=”@string/app_name”>
        <activity android:name=”.FirstAppActivity”
                  android:label=”@string/app_name”>
            <intent-filter>
                                <action android:name=”android.intent.action.MAIN” />
                <category android:name=”android.intent.category.HOME_FIRST” />
                <category android:name=”android.intent.category.DEFAULT” />
                <category android:name=”android.intent.category.MONKEY” />
            </intent-filter>
        </activity>
    </application>

$ . build/envsetup.sh
$ mmm frameworks/base
$ mmm frameworks/base/services/java
$ mmm frameworks/policies/base/mid
$ mmm frameworks/policies/base/phone