android statusbar 的修改
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由于完全改了status bar,建议先做几张png图片,加到
Frameworks/base/core/res/res/drawable
下。最好做一张背景图,替换 statusbar_background.png
另外我又加了几张icon,分别是home menu和back的正常和按下状态。
这些图片为:
frameworks/base/core/res/res/drawable/ic_menu_back_pressed.png
frameworks/base/core/res/res/drawable/ic_menu_home_pressed.png
frameworks/base/core/res/res/drawable/ic_menu_more_pressed.png
frameworks/base/core/res/res/drawable/ic_volume_down_pressed.png
frameworks/base/core/res/res/drawable/ic_volume_up_pressed.png
frameworks/base/core/res/res/drawable/ic_menu_back.png
frameworks/base/core/res/res/drawable/ic_menu_home.png
frameworks/base/core/res/res/drawable/ic_menu_more.png
frameworks/base/core/res/res/drawable/ic_volume_down.png
frameworks/base/core/res/res/drawable/ic_volume_up.png
修改步骤为:
一.修改xml界面
1.创建按钮
frameworks/base/core/res/res/drawable/btn_sbicon_back.xml
frameworks/base/core/res/res/drawable/btn_sbicon_home.xml
frameworks/base/core/res/res/drawable/btn_sbicon_menu.xml
frameworks/base/core/res/res/drawable/btn_sbicon_vol_down.xml
frameworks/base/core/res/res/drawable/btn_sbicon_vol_up.xml
基结构如下:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@drawable/ic_menu_back_pressed" />
<item android:state_pressed="false" android:drawable="@drawable/ic_menu_back" />
</selector>
2. 增加图标
更改整个status bar,我的方法是:
修改status bar的layerout文件:
Frameworks/base/core/res/res/layout/status_bar.xml
在原来的linearlayout中新增 image view
<?xml version="1.0" encoding="utf-8"?>
<com.android.server.status.StatusBarView xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/statusbar_background"
android:orientation="vertical"
android:focusable="true"
android:descendantFocusability="afterDescendants"
>
<LinearLayout android:id="@+id/keys"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:orientation="horizontal">
<ImageView android:id="@+id/status_home"
android:layout_width="40dip"
android:layout_height="40dip"
android:clickable="true"
android:layout_gravity="top"
android:paddingTop="1dip"
android:paddingRight="1dip"
android:paddingLeft="1dip"
android:src="@drawable/btn_sbicon_home" />
<ImageView android:id="@+id/status_back"
android:layout_width="40dip"
android:layout_height="40dip"
android:clickable="true"
android:layout_gravity="top"
android:paddingTop="1dip"
android:paddingRight="1dip"
android:paddingLeft="1dip"
android:src="@drawable/btn_sbicon_back" />
<ImageView android:id="@+id/status_menu"
android:layout_width="40dip"
android:layout_height="40dip"
android:clickable="true"
android:layout_gravity="top"
android:paddingTop="1dip"
android:paddingRight="1dip"
android:paddingLeft="1dip"
android:src="@drawable/btn_sbicon_menu" />
<ImageView android:id="@+id/status_vol_down"
android:layout_width="40dip"
android:layout_height="40dip"
android:clickable="true"
android:layout_gravity="top"
android:paddingTop="1dip"
android:paddingRight="1dip"
android:paddingLeft="1dip"
android:src="@drawable/btn_sbicon_vol_down" />
<ImageView android:id="@+id/status_vol_up"
android:layout_width="40dip"
android:layout_height="40dip"
android:clickable="true"
android:layout_gravity="top"
android:paddingTop="1dip"
android:paddingRight="1dip"
android:paddingLeft="1dip"
android:src="@drawable/btn_sbicon_vol_up" />
</LinearLayout>
......
</com.android.server.status.StatusBarView>
这样做的好处就是简单。同时保证home、menu、back按钮,不受它本来的约束。这样status bar上即可看到这些按钮了。
图标的位置,可通过修改 paddingRight, paddingLeft 和paddingTop的值达到最佳视觉效果。
3. 修改status bar的高度。
既然要在status bar上增加那么几个按钮,当然是想要使用触摸操作的,android自带的status bar高度太小,不适用。对于7寸屏的话,50pixel的高度应该是差不多了。
修改高度很简单,修改frameworks/base/core/res/res/values/dimens.xml的status_bar_height属性
<!-- Height of the status bar -->
<dimen name="status_bar_height">50dip</dimen>
也可以更改状态栏Icon的大小,frameworks/base/core/res/res/layout/status_bar_icon.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="25dp"
android:layout_height="25dp" >
当然,如果相改title的高度,可以修改 Frameworks/base/core/res/res/values/themes.xml中的Window attributes的windowTitleSize值
编译运行一下:
~/donut$ source ./env.sh
~/donut$ make –j8
~/donut$ emulator –skin WVGA800
~/donut$ source ./env.sh
~/donut$ make –j8
~/donut$ emulator –skin WVGA800
看状态栏是不是改变了?
二 为按钮添加模拟按键
修改frameworks/base/services/java/com/android/server/status/StatusBarView.java
1.添加各个图片按钮的引用,
android.widget.LinearLayout keysLayout;
android.widget.ImageView btnHome;
android.widget.ImageView btnBack;
android.widget.ImageView btnMenu;
android.widget.ImageView btnVolUp;
android.widget.ImageView btnVolDown;
2.修改onFinishInflate()函数,各个图片ID在上面的status_bar.xml中已经定义
@Override
protected void onFinishInflate() {
......
keysLayout = (android.widget.LinearLayout)findViewById(R.id.keys);
btnHome = (android.widget.ImageView)findViewById(R.id.status_home);
btnBack = (android.widget.ImageView)findViewById(R.id.status_back);
btnMenu = (android.widget.ImageView)findViewById(R.id.status_menu);
btnVolUp = (android.widget.ImageView)findViewById(R.id.status_vol_up);
btnVolDown = (android.widget.ImageView)findViewById(R.id.status_vol_down);
btnHome.setOnClickListener(mKeysListener);
btnBack.setOnClickListener(mKeysListener);
btnMenu.setOnClickListener(mKeysListener);
btnVolUp.setOnClickListener(mKeysListener);
btnVolDown.setOnClickListener(mKeysListener);
}
3.添加各个按钮的事件监听Listener
android.view.View.OnClickListener mKeysListener = new android.view.View.OnClickListener(){
public void onClick(View v) {
switch (v.getId()) {
case R.id.status_home:
mKeysHandler.sendEmptyMessage(KEY_HOME);
break;
case R.id.status_back:
mKeysHandler.sendEmptyMessage(KEY_BACK);
break;
case R.id.status_menu:
mKeysHandler.sendEmptyMessage(KEY_MENU);
break;
case R.id.status_vol_up:
mKeysHandler.sendEmptyMessage(KEY_VOL_UP);
break;
case R.id.status_vol_down:
mKeysHandler.sendEmptyMessage(KEY_VOL_DOWN);
break;
default:
break;
}
}};
4.添加模拟按键处理
private static final int KEY_HOME = 1000;
private static final int KEY_BACK = 1001;
private static final int KEY_MENU = 1002;
private static final int KEY_VOL_UP = 1003;
private static final int KEY_VOL_DOWN = 1004;
private Handler mKeysHandler = new Handler(){
public void handleMessage(Message msg) {
switch (msg.what) {
case KEY_HOME:
sendKey(KeyEvent.KEYCODE_HOME);
break;
case KEY_BACK:
sendKey(KeyEvent.KEYCODE_BACK);
break;
case KEY_MENU:
sendKey(KeyEvent.KEYCODE_MENU);
break;
case KEY_VOL_UP:
((android.media.AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE))
.adjustVolume(android.media.AudioManager.ADJUST_RAISE, android.media.AudioManager.STREAM_MUSIC);
break;
case KEY_VOL_DOWN:
((android.media.AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE))
.adjustVolume(android.media.AudioManager.ADJUST_LOWER, android.media.AudioManager.STREAM_MUSIC);
break;
default:
break;
}
}
private void sendKey(final int keyCode) {
//加此线程主要是为了后面的Thread.sleep(100),因为StatusBar在模拟按键的时候会先产生TouchEvent,如果此处不做延时,则模拟按键会与StatusBarView的Touch事件在消息队列中产生一个死锁
Thread t = new Thread(){
public void run() {
try {
Thread.sleep(100);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
long now = SystemClock.uptimeMillis();
long n = System.currentTimeMillis();
Log.d("Tiger", "Intent.ACTION_SOFT_" + keyCode+ "_PRESSED 0=" + n);
try {
KeyEvent down = new KeyEvent(now, now, KeyEvent.ACTION_DOWN, keyCode, 0);
KeyEvent up = new KeyEvent(now, now, KeyEvent.ACTION_UP, keyCode, 0);
Log.d("Tiger", "Intent.ACTION_SOFT_" + keyCode+ "_PRESSED 1="+ (System.currentTimeMillis()));
IWindowManager wm = IWindowManager.Stub.asInterface(ServiceManager.getService("window"));
Log.d("Tiger", "Intent.ACTION_SOFT_" + keyCode+ "_PRESSED 2="+ (System.currentTimeMillis()));
wm.injectKeyEvent(down, false);
Log.d("Tiger", "Intent.ACTION_SOFT_" + keyCode+ "_PRESSED 3="+ (System.currentTimeMillis()));
wm.injectKeyEvent(up, false);
Log.d("Tiger", "Intent.ACTION_SOFT_" + keyCode+ "_PRESSED 4="+ (System.currentTimeMillis()));
} catch (RemoteException e) {
Log.i("Input", "DeadOjbectException");
}
}
};
t.start();
}
};
5.避免在按下这几个按钮时,触发下拉Notification视图,影响性能
修改onInterceptTouchEvent(MotionEvent event)函数
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
if (keysLayout.getRight() < event.getX())
return mService.interceptTouchEvent(event) ? true : super.onInterceptTouchEvent(event);
return false;
}
这样,基本上就完成了。
编译一下
~/donut$ source ./env.sh
~/donut$ make update-api
~/donut$ make –j8
~/donut$ emulator –skin WVGA800
~/donut$ source ./env.sh
~/donut$ make update-api
~/donut$ make –j8
~/donut$ emulator –skin WVGA800
补充:在打开StatusBarExpandView时按模拟按键,会出现停顿的原因分析
我们先看一下执行流程
在com.android.server.WindowManagerService.injectKeyEvent(KeyEvent, boolean)函数中我们可以看到实际上是调用dispatchKey(newEvent, pid, uid)函数,这个dispatchKey函数中:
需要先找到当前的焦点focusObj(focusObj:WindowState 就是在维护窗口ViewRoot与WindowManagerService之前的关联,这二者的通信都在WindowState中可以找到);再用focusObj把KeyEvent传递给当前焦点窗口。但在传递之前会先调用mKeyWaiter.waitForNextEventTarget()函数等待当前焦点处理完上一次事件(这包括KeyEvent,MotionEvent...等),如何判断是否处理完上一次事件,用if (mFinished && !mDisplayFrozen) if (targetWin != null)这两个if语句判断,而最关键就是这个mFinished ,这里还得查看ViewRoot,在ViewRoot中分发事件后会调用sWindowSession.finishKey(mWindow);告诉WindowManagerService,在doFinishedKeyLocked()函数中将mFinished = true,如果mFinished不为true,则会wait(curTimeout),这就是出现停顿的直接原因
通过打印Log显示是我们的KeyEvent.Action_Down事件一直不能mFinished,这就要跟踪ViewRoot,发现每次在模拟的KeyEvent.Action_Down事件的Message根本不能被处理,原因是StatusBarView的TouchEvent没有处理完成,并且与模拟的KeyEvent.Action_Down事件在MessageQueue的next函数中卡住了而ViewRoot本身就是一个Handler,大量的Message从此经过,而StatusBar的ViewRoot既要处理Touch事件也要处理模拟按键,就出现了这种竞态死锁的现象。
延迟发送模拟的KeyEvent是我目前采用的解决方式,上面的例子中sendKey函数已经体现
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