java - 使用动画绘制显示动画

Question

我在 Android 开发者网站上读到了如何将图像序列转换为动画的方法。但没有显示任何内容。无论是图像还是动画。

package org.example.anim;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.widget.ImageView;

public class MainActivity extends Activity {

AnimationDrawable frameAnimation;


@Override
protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


     ImageView img = (ImageView)findViewById(R.id.spinning_wheel_image);
     img.setBackgroundResource(R.drawable.spin_animation);

      // Get the background, which has been compiled to an AnimationDrawable  
       frameAnimation = (AnimationDrawable) img.getBackground();

      // Start the animation (looped playback by default).
     }

 public void onWindowFocusChanged()
 {

    frameAnimation.start();
 }


}

Answer 1

    ImageView progressSpinner = (ImageView) findViewById(R.id.progressSpinner);

    // Set the background of the image - In this case an animation
    // (/res/anim folder)
    progressSpinner.setBackgroundResource(R.anim.progress_animation);
    // Get the image background and attach the AnimationDrawable to it.
    progressAnimation = (AnimationDrawable) progressSpinner.getBackground();
    progressAnimation.start();

将图像从drawable移动到anim文件夹并在onCreate中尝试此代码。