android 9.0 Launcher3 去掉抽屉式,显示所有 app

效果图

修改思路

1、增加全局控制变量 sys.launcher3.is_full_app，用来动态切换

2、增加两套布局，对应有抽屉和无抽屉

3、去除 allAppsButton

4、将 AllAppsContainerView 中的图标加载到 Workspace

5、新安装的 app 自动添加图标到 Workspace

6、替换 Workspace 图标长按删除选项为取消

7、屏蔽上拉显示抽屉页面手势

8、修改页面指示线为圆点

上代码

1、增加全局控制变量 sys.launcher3.is_full_app

1) 在 LauncherAppState 中增加静态方法 isDisableAllApps(), 通过修改 Settings 中自定义的值 sys.launcher3.is_full_app

vendor\mediatek\proprietary\packages\apps\Launcher3\src\com\android\launcher3\LauncherAppState. java

   private static  Context mContext;

public static boolean isDisableAllApps() {
        if (mContext != null) {
            return Settings.System.getInt(mContext.getContentResolver(), 
                "sys.launcher3.is_full_app", 0) == 1;
        }
        return true;
    }

vendor\mediatek\proprietary\packages\apps\Launcher3\AndroidManifest-common.xml

2) AndroidManifest-common.xml 中增加权限

<uses-permission android:name="android.permission.WRITE_SETTINGS" />

3) 在 SettingsActivity 中增加 SwitchPreference 用以动态修改 sys.launcher3.is_full_app

vendor\mediatek\proprietary\packages\apps\Launcher3\src\com\android\launcher3\SettingsActivity.java

在内部类 LauncherSettingsFragment 中重写 onPreferenceTreeClick() 用以监听 SwitchPreference 点击

/**
     * This fragment shows the launcher preferences.
     */
    public static class LauncherSettingsFragment extends PreferenceFragment {
    
    .....
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

    ....

            //读取保存的值，初始化 SwitchPreference 的初始状态，是否选中
            int isFull = Settings.System.getInt(getActivity().getContentResolver(), 
                "sys.launcher3.is_full_app", 0);
            Log.d("Launcher3", "sys.launcher3.is_full_app="+isFull);
            SwitchPreference fullSwitch = (SwitchPreference) findPreference("pref_is_full_app");
            fullSwitch.setChecked(isFull==1);
     }


    
    //add for change is_full_app value
    @Override
    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
            boolean result = true;
            final String key = preference.getKey();

             if ("pref_is_full_app".equals(key)) {
                boolean checked = ((SwitchPreference) preference).isChecked();

                Settings.System.putInt(getActivity().getContentResolver(), "sys.launcher3.is_full_app",
                        checked ? 1 : 0);

                Log.e("Launcher3", "SwitchPreference checked="+checked);

                // Value has changed
                ProgressDialog.show(getActivity(),
                        null /* title */,
                        getActivity().getString(R.string.full_app_override_progress),
                        true /* indeterminate */,
                        false /* cancelable */);
                new LooperExecutor(LauncherModel.getWorkerLooper()).execute(
                        new OverrideApplyHandler(getActivity()));
                
            }
            return result;
        }

}

点击 SwitchPreference 后需要保存 sys.launcher3.is_full_app 新值，同时清除 Launcher3 的缓存，延时启动并结束当前进程

清除缓存方法 clearApplicationUserData 在 Launcher3 中编译报错，所以通过发送广播到 Setting 中进行真正的清缓存操作

    //add for change is_full_app value
    private static class OverrideApplyHandler implements Runnable {

        private final Context mContext;

        private OverrideApplyHandler(Context context) {
            mContext = context;
        }

        @Override
        public void run() {
            // Clear the icon cache.
            LauncherAppState.getInstance(mContext).getIconCache().clear();

            // Wait for it
            try {
                Thread.sleep(1000);
            } catch (Exception e) {
                Log.e("Launcher3", "Error waiting", e);
            }

            // Schedule an alarm before we kill ourself.
            Intent homeIntent = new Intent(Intent.ACTION_MAIN)
                    .addCategory(Intent.CATEGORY_HOME)
                    .setPackage(mContext.getPackageName())
                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            PendingIntent pi = PendingIntent.getActivity(mContext, 42,
                    home