修改Launcher源码之快速启动
最近在写一个快速拨号的App，应用很简单，主要要突出一个快速的特点，启动要快，最好能从Home Screen启动，当然第一个反应是在桌面上新建一个快捷方式，不过我决定用另一种特别的方式，即：当用户在Home Screen中上下触屏时，启动此应用，左右触屏是切换桌面的。废话不多说，看怎样实现：1、编译运行Launcher源码，具体可参照网上相关介绍，本来打算附上修改后的源码，不过文件太大，需要的话可以找我，建议参考网络资料自己动手编译。
2、修改Launcher源码，只要改一处，修改Workspace类的onInterceptTouchEvent方法
Workspace相当于你看到的一个桌面，触屏事件在到达onTouchEvent之前会先执行onInterceptTouchEvent方法。
如果你想通过在桌面空白处用触屏事件来启动你的应用的话，可以用此方法，不过用户不一定接受你的定制Launcher。
[代码] 代码public boolean onInterceptTouchEvent(MotionEvent ev) {
/*****************省略相关代码***********/
final float x = ev.getX();
final float y = ev.getY();
Log.d("Workspace", "enter onInterceptTouchEvent");
switch (action) {
case MotionEvent.ACTION_MOVE:
/**
* mIsBeingDragged == false, otherwise the shortcut would have caught it.
* Check
* whether the user has moved far enough from his original down touch.
*/
/**
* Locally do absolute value. mLastMotionX is set to the y value
* of the down event.
*/
final int xDiff = (int) Math.abs(x - mLastMotionX);
final int yDiff = (int) Math.abs(y - mLastMotionY);
final int touchSlop = mTouchSlop;
boolean xMoved = xDiff > touchSlop;
boolean yMoved = yDiff > touchSlop;
if (xMoved || yMoved) {
if (xMoved) {
// Scroll if the user moved far enough along the X axis
mTouchState = TOUCH_STATE_SCROLLING;
enableChildrenCache();
}
/*********************************添加的代码****************************************/
if(yMoved) { //纵向移动
Log.d("workspace", "在这启动你的应用程序！");
Intent intent = new Intent();
//设置应用的包名，类名
intent.setClassName("com.tek.qd", "com.tek.qd.QuickDialer");
//启动应用
mContext.startActivity(intent);
mTouchState = TOUCH_STATE_SCROLLING;
enableChildrenCache();
}
/*********************************代码结束****************************************/
// Either way, cancel any pending longpress
if (mAllowLongPress) {
mAllowLongPress = false;
// Try canceling the long press. It could also have been scheduled
// by a distant descendant, so use the mAllowLongPress flag to
//block
// everything
final View currentScreen = getChildAt(mCurrentScreen);
currentScreen.cancelLongPress();
}
}
break;
case MotionEvent.ACTION_DOWN:
// Remember location of down touch
mLastMotionX = x;
mLastMotionY = y;
mAllowLongPress = true;
/**
* If being flinged and user touches the screen, initiate drag;
* otherwise don't.mScroller.isFinished should be false when
* being flinged.
*/
mTouchState = mScroller.isFinished() ?
TOUCH_STATE_REST : TOUCH_STATE_SCROLLING;
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if (mTouchState != TOUCH_STATE_SCROLLING) {
final CellLayout currentScreen = (CellLayout) getChildAt(
mCurrentScreen);
if (!currentScreen.lastDownOnOccupiedCell()) {
getLocationOnScreen(mTempCell);
// Send a tap to the wallpaper if the last down was on
//empty space
mWallpaperManager.sendWallpaperCommand(getWindowToken(),
"android.wallpaper.tap",
mTempCell + (int) ev.getX(),
mTempCell + (int) ev.getY(), 0, null);
}
}
// Release the drag
clearChildrenCache();
mTouchState = TOUCH_STATE_REST;
mAllowLongPress = false;
break;
}
/**
* The only time we want to intercept motion events is if we are in the
* drag mode.
*/
return mTouchState != TOUCH_STATE_REST;
}
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