使用動畫可繪制顯示動畫

Question

我已經在android開發者網站上閱讀了如何將圖像序列轉換為動畫的內容。 但是什么也不顯示，圖像和動畫都不顯示。

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();

將圖像從可繪制圖像移動到anim文件夾，然后在onCreate中嘗試此代碼。

Answer 2

如果您添加了多個圖像，並且spin_animation是這樣的列表：

<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>

然后代碼必須工作，我認為您沒有正確生成此列表。也請參見此鏈接以獲取更多有關動畫可繪制的幫助