Android WindowManager及其动画问题

 lp.windowAnimations = R.style.anim_view;//动画

设置系统动画可能还有效果，设置自己的动画似乎没有什么效果，

底部别人提供了自定义的动画，是OK的

转载地址是 :

http://www.2cto.com/kf/201408/328978.html

WindowManager上像在Activity中使用动画效果无效，比如下面的代码：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

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();

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

?

1 2 3 4 5 6 7 8 9 10 11

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);

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：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176

/** * */ 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);       }   }

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。