Android studio 学习4：实现2D翻转

Android studio ：实现2D翻转
一、准备

1、需要两张图片
2、了解FrameLayout布局

二、具体代码实现

xml代码：

<FrameLayout 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"
    android:id="@+id/root"
    tools:context=".MainActivity">
   <ImageView
       android:id="@+id/a"
       android:src="@drawable/a"
       android:layout_width="match_parent"
       android:layout_height="match_parent"/>
    <ImageView
        android:id="@+id/b"
        android:src="@drawable/b"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</FrameLayout>

java代码：

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    private ImageView imageA;
    private ImageView imageB;

    //创建动画1
    private ScaleAnimation sato0 = new ScaleAnimation( 1,0,1,1,
            Animation.RELATIVE_TO_PARENT,0.5f,Animation.RELATIVE_TO_PARENT,0.5f );
    //创建动画2
    private ScaleAnimation sato1 = new ScaleAnimation( 0,1,1,1,
            Animation.RELATIVE_TO_PARENT,0.5f,Animation.RELATIVE_TO_PARENT,0.5f );

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_main );
        initView();
        findViewById( R.id.root ).setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
//                imageA.startAnimation( sato0 );
                if(imageA.getVisibility() == View.VISIBLE){
                    imageA.startAnimation( sato0 );
                }else {
                    imageB.startAnimation( sato0 );
                }
            }
        } );
    }
    private void showImageA(){
        imageA.setVisibility( View.VISIBLE );
        imageB.setVisibility( View.INVISIBLE );
    }

    private void showImageB(){
        imageA.setVisibility( View.INVISIBLE );
        imageB.setVisibility( View.VISIBLE );
    }

    private void initView(){
        imageA = findViewById( R.id.a );
        imageB = findViewById( R.id.b );
        showImageA();
        sato0.setDuration( 500 );
        sato1.setDuration( 500 );

        //添加结束监听
        sato0.setAnimationListener( new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {

            }

            @Override
            public void onAnimationEnd(Animation animation) {
                if(imageA.getVisibility() == View.VISIBLE){
                    imageA.setAnimation( null );
                    showImageB();
                    imageB.setAnimation( sato1 );
                }else {
                    imageB.setAnimation( null );
                    showImageA();
                    imageA.startAnimation( sato1 );
                }
            }

            @Override
            public void onAnimationRepeat(Animation animation) {
            }
        } );
    }
}