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Android图形图像与动画之AnimationListener简介

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就像Button控件有监听器一样,动画效果也有监听器,只需要实现AnimationListener就可以实现对动画效果的监听,其中需要重载三个函数,就是下面的这几个函数:

private class MyListenr implements AnimationListener{

        @Override
        public void onAnimationEnd(Animation arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onAnimationRepeat(Animation arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onAnimationStart(Animation arg0) {
            // TODO Auto-generated method stub

        }

    }

                                其中第一个函数的意思是在动画执行完之后需要开发者做什么,第二个函数的意思是在动画重复执行的过程中应该做什么,第三个函数的意思是当动画开始执行时有什么动作发生。

具体的实现代码如下:

public class MainActivity extends Activity {
    private Button button;
    private Button button2;
    private ImageView imageView;
    private ViewGroup viewGroup;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button=(Button)findViewById(R.id.button_add);
        button2=(Button)findViewById(R.id.button_delete);
        imageView=(ImageView)findViewById(R.id.imageView1);
        viewGroup=(ViewGroup)findViewById(R.id.viewGroup);
        button.setOnClickListener(new Mybutton());
        button2.setOnClickListener(new Mybutton());
    }
    private class Mybutton implements OnClickListener{

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            switch (v.getId()) {
            case R.id.button_add:
                Add();
                break;
            case R.id.button_delete:
                Delete();
                break;

            default:
                break;
            }
        }
    }

    public void Add() {
        AlphaAnimation alphaAnimation=new AlphaAnimation(0.0f, 1.0f);
        alphaAnimation.setDuration(2000);
        alphaAnimation.setStartOffset(500);
        ImageView imageViewAdd=new ImageView(MainActivity.this);
        imageViewAdd.setImageResource(R.drawable.ic_launcher);
        viewGroup.addView(imageViewAdd);
//      viewGroup.addView(imageViewAdd, new LayoutParams(
//              LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
        imageViewAdd.startAnimation(alphaAnimation);
    }
    public void Delete() {
        AlphaAnimation alphaAnimation=new AlphaAnimation(1.0f, 0.0f);
        alphaAnimation.setDuration(2000);
        alphaAnimation.setStartOffset(500);
        imageView.startAnimation(alphaAnimation);
        alphaAnimation.setAnimationListener(new MyListenr());
    }

    private class MyListenr implements AnimationListener{

        @Override
        public void onAnimationEnd(Animation arg0) {
            // TODO Auto-generated method stub
            viewGroup.removeView(imageView);
            Log.d("BruceZhang", "Animation End!");
        }

        @Override
        public void onAnimationRepeat(Animation arg0) {
            // TODO Auto-generated method stub
            Log.d("BruceZhang", "Animation Repeat!");
        }

        @Override
        public void onAnimationStart(Animation arg0) {
            // TODO Auto-generated method stub
            Log.d("BruceZhang", "Animation Start!");
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

                                此实例的布局文件如下,注意,需要在根标签下给出viewGroup的id:
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:id="@+id/viewGroup"
    >

    <Button
        android:id="@+id/button_add"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_x="0dp"
        android:layout_y="367dp"
        android:text="添加图片" />

    <Button
        android:id="@+id/button_delete"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_x="0dp"
        android:layout_y="410dp"
        android:text="删除图片" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_x="153dp"
        android:layout_y="155dp"
        android:src="@drawable/ic_launcher" />

</AbsoluteLayout>

标签:AnimationListener,动画,Android

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