Question

我已经在Android开发者网站上看到了如何将图像序列转换为动画。但没有显示任何内容。无论是图像而不是动画。

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。

Answer 2

如果您添加了多张图片，并且您的spin_animation列表如下：

<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="true">
    <item android:drawable="@drawable/rocket_thrust1" android:duration="200" />
    <item android:drawable="@drawable/rocket_thrust2" android:duration="200" />
    <item android:drawable="@drawable/rocket_thrust3" android:duration="200" />
</animation-list>

然后代码必须正常工作，我认为您还没有正确生成此列表。另请参阅此链接以获取更多帮助animation drawable

使用动画可绘制显示动画

2 个答案: