属性动画

属性动画 效果如下：




public class SecondActivity extends AppCompatActivity implements View.OnClickListener {
    //动画 三种 补间动画 帧动画 属性动画3.0之后
    private ImageView img,img2;
    private Button rotateX;
    private Button rotateY;
    private Button alpha;
    private Button scaleX;
    private Button scaleY;
    private Button total;
    private Button down;

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

    }
    private void setListener() {
        rotateX.setOnClickListener(this);
        rotateY.setOnClickListener(this);
        alpha.setOnClickListener(this);
        scaleX.setOnClickListener(this);
        scaleY.setOnClickListener(this);
        total.setOnClickListener(this);
        down.setOnClickListener(this);
    }

    private void initView() {
        img = ((ImageView) findViewById(R.id.img));
        img2 = ((ImageView) findViewById(R.id.img2));
        rotateX = ((Button) findViewById(R.id.rotateX));
        rotateY = ((Button) findViewById(R.id.rotateY));
        alpha = ((Button) findViewById(R.id.alpha));
        scaleX = ((Button) findViewById(R.id.scaleX));
        scaleY = ((Button) findViewById(R.id.scaleY));
        total = ((Button) findViewById(R.id.total));
        down = ((Button) findViewById(R.id.down));
    }

    @Override
    public void onClick(View view) {
        final View v=view;
        switch (view.getId()){

            //ObjectAnimator
            case R.id.rotateX://沿着x轴旋转  0-360度  -
                ObjectAnimator.ofFloat(img,"rotationX",0.0f,360f,180f).setDuration(1000).start();
                break;
            case R.id.rotateY://沿着y轴旋转  0-360度
                ObjectAnimator.ofFloat(img,"rotationY",0.0f,360f).setDuration(1000).start();
                break;
            case R.id.alpha://渐变 即透明度的改变
                ObjectAnimator.ofFloat(img,"alpha",1.0f,0.0f,0.8f).setDuration(1000).start();
                break;
            case R.id.scaleX://x轴缩放
                ObjectAnimator.ofFloat(img,"scaleX",1.0f,0.0f,1.0f).setDuration(1000).start();
                break;
            case R.id.scaleY://y轴缩放
                ObjectAnimator.ofFloat(img,"scaleY",1.0f,0.0f,1.0f).setDuration(1000).start();
                break;
            case R.id.total://组合动画
                PropertyValuesHolder p1=PropertyValuesHolder.ofFloat("alpha",1.0f,0.0f,1.0f);
                PropertyValuesHolder p2=PropertyValuesHolder.ofFloat("scaleX",1.0f,0.0f,1.0f);
                PropertyValuesHolder p3=PropertyValuesHolder.ofFloat("scaleY",1.0f,0.0f,1.0f);
                ObjectAnimator.ofPropertyValuesHolder(img,p1,p2,p3).setDuration(1000).start();
                break;
            //ValueAnimator  自由落体
            case R.id.down:

                DisplayMetrics dm=new DisplayMetrics();
                getWindowManager().getDefaultDisplay().getMetrics(dm);
                ValueAnimator va=ValueAnimator.ofFloat(view.getY(),dm.heightPixels).setDuration(10000);
                va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                    @Override
                    public void onAnimationUpdate(ValueAnimator valueAnimator) {
                        v.setTranslationY((Float) valueAnimator.getAnimatedValue());
                    }

                });
                va.start();
                break;
        }
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="match_parent" tools:context=".MainActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:gravity="center"
        >
        <ImageView
            android:id="@+id/img"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:src="@drawable/jia"
            />
        <ImageView
            android:id="@+id/img2"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:src="@drawable/jia"
            />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >
        <Button
            android:id="@+id/rotateX"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="rotateX"
            />
        <Button
            android:id="@+id/rotateY"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="rotateY"
            />

        <Button
        android:id="@+id/alpha"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="透明度"
        />
        <Button
            android:id="@+id/scaleX"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="x轴缩放"
            />
        <Button
            android:id="@+id/scaleY"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Y轴缩放"
            />
        <Button
            android:id="@+id/total"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="组合"
            />
        <Button
            android:id="@+id/down"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="自由落体"
            />

    </LinearLayout>
</LinearLayout>