杂记一

• 在线查看android源码 androidxref
• 每个Activity里面有个window对象
• Window是个抽象类，具体实现PhoneWindow
• Window里面有个Callback interface,里面含有dispatchXXXevent,等
• window里面也有setContentview，界面等相关
• 

   

• 补：AndroidStudio中帧动画相关的xml文件放在drawable文件夹中而不是anim文件夹中。

  •   imageView.setBackgroundResource(R.drawable.frame_anime);
      animationDrawable = (AnimationDrawable) imageView.getBackground();
       animationDrawable.start();
    

    　　

    <?xml version="1.0" encoding="utf-8"?>
        <animation-list xmlns:android="http://schemas.android.com/apk/res/android"
            android:oneshot="false">
    <item android:drawable="@drawable/progress_loading_image_01" android:duration="100"/>
    <item android:drawable="@drawable/progress_loading_image_02" android:duration="100"/>
    <item android:drawable="@drawable/progress_loading_image_03" android:duration="100"/>
    <item android:drawable="@drawable/progress_loading_image_04" android:duration="100"/>
    <item android:drawable="@drawable/progress_loading_image_05" android:duration="100"/>
    <item android:drawable="@drawable/progress_loading_image_06" android:duration="100"/>
    <item android:drawable="@drawable/progress_loading_image_07" android:duration="100"/>
    <item android:drawable="@drawable/progress_loading_image_08" android:duration="100"/>
        </animation-list>
    

    　　

     GitHub demo：https://github.com/wujianning/AndroidAnimation.git

    • xml的帧动画，也可以用代码代替

        animationDrawable = new AnimationDrawable();
              for (int i = 0; i < 8; i++) {
                  int id = getResources().getIdentifier("progress_loading_image_0"+String.valueOf(i+1),"drawable",getPackageName());
                  Drawable drawable = getResources().getDrawable(id);
                  animationDrawable.addFrame(drawable,120);
      
              }
              imageView.setBackground(animationDrawable);
      
              animationDrawable = (AnimationDrawable) imageView.getBackground();