我想创建具有拖放功能的系统警报,该功能始终位于所有应用程序之上。我创建了系统警报窗口,但无法提供拖放功能。请帮助找到正确的解决方案。
问问题
899 次
1 回答
10
您可以使用WindowManager
指定的添加浮动视图WindowManager.LayoutParams
,并覆盖onTouchEvent
浮动视图的。这是代码:
public class FloatView extends View {
private WindowManager wm;
private WindowManager.LayoutParams params;
Activity mActivity;
DisplayMetrics metrics;
float x;
float y;
float touchX;
float touchY;
public FloatView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mActivity = (Activity) context;
wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
params = new WindowManager.LayoutParams();
metrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(metrics);
}
public FloatView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FloatView(Context context) {
this(context, null);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
x = event.getRawX();
y = event.getRawY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touchX = event.getX();
touchY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
updateViewPostion();
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
animateToEdge();
touchX = touchY = 0;
break;
default:
break;
}
return super.onTouchEvent(event);
}
private void animateToEdge() {
int currentX = (int) (x - touchX);
ValueAnimator ani;
if (currentX > metrics.widthPixels / 2) {
ani = ValueAnimator.ofInt(currentX, metrics.widthPixels - getMeasuredWidth());
} else {
ani = ValueAnimator.ofInt(currentX, 0);
}
params.y = Math.min(Math.max(0, (int) (y - touchY)),
metrics.heightPixels - getMeasuredHeight());
ani.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
params.x = (Integer) animation.getAnimatedValue();
wm.updateViewLayout(FloatView.this, params);
}
});
ani.setDuration(200l);
ani.setInterpolator(new AccelerateDecelerateInterpolator());
ani.start();
}
private void updateViewPostion() {
params.x = Math.min(Math.max(0, (int) (x - touchX)), metrics.widthPixels - getMeasuredWidth());
params.y = Math.min(Math.max(0, (int) (y - touchY)),
metrics.heightPixels - getMeasuredHeight());
wm.updateViewLayout(this, params);
}
public WindowManager.LayoutParams getWindowManagerLayoutParams() {
return params;
}
}
然后您可以将此浮动视图添加到WindowManager
您的活动中:
private void showFloatView() {
FloatView mFloatView = new FloatView(this);
mFloatView.setBackgroundResource(R.drawable.btn_facebook);
WindowManager wm = getWindowManager();
WindowManager.LayoutParams params = mFloatView.getWindowManagerLayoutParams();
params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
params.format=1;
params.flags = params.flags | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;
params.alpha = 1.0f;
params.gravity=Gravity.LEFT|Gravity.TOP;
params.x=0;
params.y=0;
params.width=WindowManager.LayoutParams.WRAP_CONTENT;
params.height=WindowManager.LayoutParams.WRAP_CONTENT;
wm.addView(mFloatView, params);
}
于 2013-08-29T05:50:12.747 回答