Android WindowManager及其动画问题
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本:1.0 日期:2014.8.16 2014.8.23 2014.8.26版权:© 2014 kince 转载注明出处 一、概述 开发中发现在WindowManager上像在Activity中使用动画效果无效,比如下面的代码: 二、分析 为什么会不执行动画呢,原因在于:the view which is going to be animated must not be directly added to the top window, because top window of android is not a real ViewGroup. so the view must be added to a ViewGroup like FrameLayout first and then this ViewGroup be added to the top window.意思是说动画执行的条件是不能直接添加到最顶层的Window,而是需要一个容器。比如,在xml中定义的控件就可以使用动画。 后来发现一种解决方案是WindowManager.LayoutParams有一个动画属性:windowAnimations,可以这样使用 但是,这是对整个View的一个动画,而不是View中某个控件的动画。而且,使用的时候需要在View状态改变的时候才会出现动画效果。比如消失/出现的时候才会有动画效果。因此这个方案也是行不通的。 既然WindowManager不是一个ViewGroup,那么就构造一个容器来装载WindowManager,可以如下: 这样一来,就可以实现在WindowManager上的动画效果了。其实,造成这种现象的原因在于对Android API以及其体系的理解不够深刻。忽略了动画执行所需要的基本条件,影射的问题就是考虑问题不够全面。所以,不论开发哪种功能,使用哪个API,前期的规划、调研很重要。知己知彼,仅此而已。
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ImageView iv =
new
ImageView(
this
);
iv.setImageResource(R.drawable.ic_launcher);
TranslateAnimation animation =
new
TranslateAnimation(
Animation.ABSOLUTE,
20
, Animation.ABSOLUTE,
300
,
Animation.ABSOLUTE,
100
, Animation.ABSOLUTE,
400
);
animation.setDuration(
1000
);
animation.setFillAfter(
false
);
iv.setAnimation(animation);
WindowManager mWindowManager = (WindowManager)
this
.getSystemService(Context.WINDOW_SERVICE);
WindowManager.LayoutParams mLayoutParams =
new
WindowManager.LayoutParams();
mLayoutParams.x =
20
;
mLayoutParams.y =
100
;
mLayoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
mLayoutParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
mLayoutParams.gravity = Gravity.TOP;
mLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
mWindowManager.addView(iv, mLayoutParams);
animation.start();
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lp =
new
WindowManager.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_PHONE,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
PixelFormat.RGBA_8888);
lp.gravity = Gravity.LEFT |Gravity.TOP;
lp.windowAnimations = R.style.anim_view;
//动画
wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
wm.addView(view, lp);
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/**
*
*/
package
com.kince.apus.widget;
import
com.kince.apus.R;
import
android.animation.Animator;
import
android.animation.Animator.AnimatorListener;
import
android.animation.AnimatorSet;
import
android.animation.ObjectAnimator;
import
android.content.Context;
import
android.graphics.PixelFormat;
import
android.os.Handler;
import
android.util.AttributeSet;
import
android.view.LayoutInflater;
import
android.view.View;
import
android.view.WindowManager;
import
android.widget.FrameLayout;
import
android.widget.ImageView;
import
android.widget.TextView;
/**
* @author kince
* @category Windowmanager在Layout中的应用
*
*
*/
public
class
GuideLayout
extends
FrameLayout {
private
WindowManager wManager;
private
WindowManager.LayoutParams wmParams;
private
View addView;
private
TextView mTextView;
private
ImageView mImageView;
private
boolean
isAddView;
private
AnimatorSet mShowAnimatorSet, mHideAnimatorSet;
private
Handler mHandler =
new
Handler() {
public
void
handleMessage(android.os.Message msg) {
super
.handleMessage(msg);
switch
(msg.what) {
case
1
:
showAnimator();
break
;
default
:
break
;
}
};
};
/**
* @param context
*/
public
GuideLayout(Context context) {
this
(context,
null
);
// TODO Auto-generated constructor stub
}
/**
* @param context
* @param attrs
*/
public
GuideLayout(Context context, AttributeSet attrs) {
this
(context, attrs,
0
);
// TODO Auto-generated constructor stub
}
/**
* @param context
* @param attrs
* @param defStyle
*/
public
GuideLayout(Context context, AttributeSet attrs,
int
defStyle) {
super
(context, attrs, defStyle);
addView = LayoutInflater.from(context).inflate(R.layout.guide_layout,
this
);
mTextView = (TextView) addView.findViewById(R.id.tv);
mImageView = (ImageView) addView.findViewById(R.id.iv);
mTextView.setVisibility(View.GONE);
mImageView.setVisibility(View.GONE);
setAnimator();
getWindowManager(context);
}
/**
* @category 实例化WindowManager 初次模拟位置时候使用
* @param context
*/
private
void
getWindowManager(
final
Context context) {
wManager = (WindowManager) context.getApplicationContext()
.getSystemService(Context.WINDOW_SERVICE);
wmParams =
new
WindowManager.LayoutParams();
wmParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
wmParams.format = PixelFormat.TRANSPARENT;
wmParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
wmParams.gravity =
17
;
wmParams.width = WindowManager.LayoutParams.MATCH_PARENT;
wmParams.height = WindowManager.LayoutParams.MATCH_PARENT;
}
private
void
setAnimator() {
mShowAnimatorSet =
new
AnimatorSet();
Animator[] showAnimator =
new
Animator[
2
];
showAnimator[
0
] = ObjectAnimator.ofFloat(mTextView,
"alpha"
,
new
float
[] {
0
.0F,
1
.0F });
showAnimator[
1
] = ObjectAnimator.ofFloat(mImageView,
"alpha"
,
new
float
[] {
0
.0F,
1
.0F });
mShowAnimatorSet.playTogether(showAnimator);
mShowAnimatorSet.setDuration(1500l);
mHideAnimatorSet =
new
AnimatorSet();
Animator[] hideAnimator =
new
Animator[
2
];
hideAnimator[
0
] = ObjectAnimator.ofFloat(mTextView,
"alpha"
,
new
float
[] {
1
.0F,
0
.0F });
hideAnimator[
1
] = ObjectAnimator.ofFloat(mImageView,
"alpha"
,
new
float
[] {
1
.0F,
0
.0F });
mHideAnimatorSet.playTogether(hideAnimator);
mHideAnimatorSet.setDuration(1500l);
}
public
void
showAnimator() {
mTextView.setVisibility(View.VISIBLE);
mImageView.setVisibility(View.VISIBLE);
mShowAnimatorSet.start();
isAddView=
true
;
}
public
void
hideAnimator() {
mHideAnimatorSet.start();
mHideAnimatorSet.addListener(
new
AnimatorListener() {
@Override
public
void
onAnimationStart(Animator animation) {
// TODO Auto-generated method stub
}
@Override
public
void
onAnimationRepeat(Animator animation) {
// TODO Auto-generated method stub
}
@Override
public
void
onAnimationEnd(Animator animation) {
// TODO Auto-generated method stub
mTextView.setVisibility(View.INVISIBLE);
mImageView.setVisibility(View.INVISIBLE);
}
@Override
public
void
onAnimationCancel(Animator animation) {
// TODO Auto-generated method stub
}
});
}
public
void
sendMessage() {
if
(isAddView) {
wManager.removeView(
this
);
mHandler.removeMessages(
1
);
isAddView=
false
;
}
mHandler.sendEmptyMessage(
1
);
wManager.addView(
this
, wmParams);
}
}
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