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Android WindowManager及其动画问题
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:
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
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:
/** * */ 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。
Android WindowManager及其动画问题
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