工作笔记

1、退出程序返回到主界面

				//back home to disable as video,games etc.
				Intent intent = new Intent(Intent.ACTION_MAIN);
				intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
				intent.addCategory(Intent.CATEGORY_HOME);
				context.startActivity(intent);

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2、关机动画时在代码里锁定竖屏

代码位置：frameworks/base/services/java/com/android/server/power/ShutdownThread.java

在beginShutdownSequence里

	//gsensor tmp
	private static boolean mUpdateRotation = false;
	private static int mSensorState = 0;
	private static IWindowManager wm = WindowManagerGlobal.getWindowManagerService();
	private static int mUserRotation = Surface.ROTATION_0;
	private static int mUserRotationMode = WindowManagerPolicy.USER_ROTATION_LOCKED;
.
.
.
				/*Add by Xandy*/  
	            /*Configure rotation lock.*/
				ContentResolver resolver = context.getContentResolver();
	            int userRotation = Settings.System.getIntForUser(resolver,
	                    Settings.System.USER_ROTATION, Surface.ROTATION_0,
	                    UserHandle.USER_CURRENT);
	            if (mUserRotation != userRotation) {
	                mUserRotation = userRotation;
	                mUpdateRotation = true;
	            }
				
	            int userRotationMode = Settings.System.getIntForUser(resolver,
	                    Settings.System.ACCELEROMETER_ROTATION, 0, UserHandle.USER_CURRENT) != 0 ?
	                            WindowManagerPolicy.USER_ROTATION_FREE :
	                                    WindowManagerPolicy.USER_ROTATION_LOCKED;
	            if (mUserRotationMode != userRotationMode) {
	                mUserRotationMode = userRotationMode;
	                mUpdateRotation = true;
	            }
 
				//lock ROTATION_0 for shutanimation	
				if(mUpdateRotation)
					wm.freezeRotation(Surface.ROTATION_0);

然后在run里面：

    // User rotation: to be used when all else fails in assigning an orientation to the device
    private static void setUserRotationMode(int mode, int rot) {
        ContentResolver res = mContext.getContentResolver();

        // mUserRotationMode and mUserRotation will be assigned by the content observer
        if (mode == WindowManagerPolicy.USER_ROTATION_LOCKED) {
            Settings.System.putIntForUser(res,
                    Settings.System.USER_ROTATION,
                    rot,
                    UserHandle.USER_CURRENT);
            Settings.System.putIntForUser(res,
                    Settings.System.ACCELEROMETER_ROTATION,
                    0,
                    UserHandle.USER_CURRENT);
        } else {
            Settings.System.putIntForUser(res,
                    Settings.System.ACCELEROMETER_ROTATION,
                    1,
                    UserHandle.USER_CURRENT);
        }
    }

.
.
.
    public void run() {
.
.
.
	//save screen rotation state before shutdown
	setUserRotationMode(mUserRotationMode, mUserRotation);
		
        rebootOrShutdown(mReboot, mRebootReason);
    }

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3、git 回滚指定文件
git reset c351eb5d8d3e7205f15104007c016d670e8fcde4 ./cam_extisp_ov5640.*
git checkout ./cam_extisp_ov5640.*
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4、预置默认输入法
a、安装需要用的默认输入法(.apk)到system/app 
b、修改文件 frameworks/base/packages/SettingsProvider/res/values/defaults.xml 
<string name="default_input_method" translatable="false">默认输入法 ID</string> 
c、\packages\apps\settings\src\com\android\settings\LanguageSettings.java中加上ID 
红色标记表示输入法 ID，比如 PinyinIME 为：com.android.inputmethod.pinyin/.PinyinIME 
搜狗输入法ID：com.sohu.inputmethod.sogou/SogouIME 


百度输入法ID：com.baidu.input/.ImeService 


ID一定要正确 
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5、系统预装必需放在data目录下的文件，但不允许每次刷机或者恢复出厂设置的时候文件丢失

a、将需要预装到data目录的文件先放置在system目录下，如/system/backup
b、在init.rc中将放置在system目录的文件通过链接的方式链接到data目录下
如：
    #backup data 
    symlink /system/backup/app/Adobe_Flash_Player.apk /data/app/Adobe_Flash_Player.apk
    symlink /system/backup/mrvl_gps.conf /data/mrvl_gps.conf


这样就算恢复出厂设置，只要system目录下的原文件存在，等系统重启之后，所需要的文件会乖乖的加到data目录下了

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6、解压分卷文件
利用split来分卷，cat来合并分卷
split -d -b 4m xx.tar.gz
cat x* > xx.tar.gz
tar zxvf xx.tar.gz
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7、app压力测试
monkey -p com.android.xx (包名) -v 500(随机事件次数)