1. 隐藏软键盘

private void hideKeyboard() {        final Activity activity = getActivity();        if (activity != null) {            View view = activity.getCurrentFocus();            InputMethodManager imm = (InputMethodManager)                    activity.getSystemService(Context.INPUT_METHOD_SERVICE);            imm.hideSoftInputFromWindow(view.getWindowToken(), 0);        }    }

 2. 判断有没有实体导航键，HOME BACK RECENT

一般是去看property qemu.hw.mainkeys

可以用adb shell getprop或者在BSP里使用SystemProperties去查看

 

3. 获取Internal和外部SD卡容量大小：

StorageManager mStorageManager;mStorageManager = context.getSystemService(StorageManager.class);final List
     
       volumes = mStorageManager.getVolumes();        Collections.sort(volumes, VolumeInfo.getDescriptionComparator());        for (VolumeInfo vol : volumes) {            if (vol.getType() == VolumeInfo.TYPE_PRIVATE) {                //Internal storage                final long volumeTotalBytes = PrivateStorageInfo.getTotalSize(vol,                        sTotalInternalStorage);            } else if (vol.getType() == VolumeInfo.TYPE_PUBLIC) {                // SD card            }        }public static long getTotalSize(VolumeInfo info, long totalInternalStorage) {        final Context context = AppGlobals.getInitialApplication();        final StorageStatsManager stats = context.getSystemService(StorageStatsManager.class);        try {            return stats.getTotalBytes(info.getFsUuid());        } catch (IOException e) {            Log.w(TAG, e);            return 0;        }    }
     

 4. frameworks修改 支持屏幕旋转180度

frameworks/base/core/res/res/values/config.xml

         
     
      true
     

参考 https://blog.csdn.net/Aaron121314/article/details/78235938

 

5. 启用/禁用锁屏旋转

修改 frameworks/base/core/res/res/values/config.xml

         
     
      false
     

去使用这个config的位置在 frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarWindowManager.java

private boolean shouldEnableKeyguardScreenRotation() {        Resources res = mContext.getResources();        return SystemProperties.getBoolean("lockscreen.rot_override", false)                || res.getBoolean(R.bool.config_enableLockScreenRotation);    }