Android中实现如win7里边屏幕保护图案中三维文字的效果。

本文主要是介绍Android中实现如win7里边屏幕保护图案中三维文字的效果。，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

具体实现如下:

activity_main.xml中定义一个用来显示文字的TextView:

MainActivity.java中定义主activity。
public class MainActivity extends Activity {
    private TextView tv_text;
    private String TAG = "MainActivity";
    Rotate3dAnimation rotateAnim = null;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //隐藏标题栏
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        //隐藏状态栏
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);

        tv_text = (TextView) findViewById(R.id.tv_text);
        if(null == tv_text){
           Log.i("MainActivity", "textview null...");
        }
        startAnimation();
    }

public void startAnimation() {

        //用来获取textview的宽度和高度，否则宽度和高度都为0
       ViewTreeObserver vto = tv_text.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

           @Override
           public void onGlobalLayout() {
               // TODO Auto-generated method stub
               tv_text.getViewTreeObserver().removeGlobalOnLayoutListener(this);
               Log.i("MainActivity", "onGlobalLayout txtNumber.width = " + tv_text.getWidth());
                Log.i("MainActivity", "onGlobalLayout txtNumber.height = " + tv_text.getHeight());

                rotateAnim = new Rotate3dAnimation(tv_text.getWidth()/2, tv_text.getHeight()/2, Rotate3dAnimation.ROTATE_CLOCKWIZE);


                if (rotateAnim != null) {
                    rotateAnim.setDuration(5000);
                    rotateAnim.setFillAfter(true);
                    rotateAnim.setInterpolator(new LinearInterpolator());
                    rotateAnim.setRepeatCount(-1);
                    rotateAnim.setRepeatMode(Animation.RESTART);
                    tv_text.startAnimation(rotateAnim);
                }

           }
       });
    }
}

//文字的翻转动画

public class Rotate3dAnimation extends Animation{

    /** 逆时针旋转*/
    public static final boolean ROTATE_CLOCKWIZE = true;
    /**动画顺时针旋转*/
    public static final boolean ROTATE_ANTICOLCKWIZE = false;
    /** Z轴上最大深度*/
    public static final float DEPTH_Z = 310.0f;
    /** 图片翻转类型*/
    private final boolean type;
    /** 翻转中心*/
    private final float centerX;
    private final float centerY;
    private Camera camera;
    /** 用于监听动画进度*/
    private InterpolatedTimeListener listener;

    public Rotate3dAnimation(float cX, float cY, boolean type) { //三个参数分别为翻转的中心位置和翻转方向
        centerX = cX;
        centerY = cY;
        this.type = type;
    }

    public void initialize(int width, int height, int parentWidth, int parentHeight) {
        // 在构造函数之后、getTransformation()之前调用本方法。
        super.initialize(width, height, parentWidth, parentHeight);
        camera = new Camera();
    }

    public void setInterpolatedTimeListener(InterpolatedTimeListener listener) {
        this.listener = listener;
    }

    //RotateAnimation.applyTransformation()第一个参数为动画的进度时间值，取值范围为[0.0f,1.0f]，
    //第二个参数Transformation记录着动画某一帧中变形的原始数据。
    //该方法在动画的每一帧显示过程中都会被调用。
    protected void applyTransformation(float interpolatedTime, Transformation transformation) {

        if (listener != null) {
            listener.interpolatedTime(interpolatedTime);
        }
        float from = 0.0f, to = 0.0f;
        if (type == ROTATE_CLOCKWIZE) {
            from = 0.0f;
            to = 180.0f;
        } else if (type == ROTATE_ANTICOLCKWIZE) {
            from = 360.0f;
            to = 180.0f;
        }
        float degree = from + (to - from) * interpolatedTime;
        boolean overHalf = (interpolatedTime > 0.5f);
        if (overHalf) {
            // 翻转过半的情况下，为保证数字仍为可读的文字而非镜面效果的文字，需翻转180度。
            degree = degree - 180;
        }

        float depth = (0.5f - Math.abs(interpolatedTime - 0.5f)) * DEPTH_Z;
        final android.graphics.Matrix matrix = transformation.getMatrix();
        camera.save(); //保存原来的状态
        camera.translate(0.0f, 0.0f, depth); //平移一段距离
        camera.rotateY(degree); //设置旋转的角度
        camera.getMatrix(matrix); //取得变换矩阵
        camera.restore();   //操作完后，恢复到原来的状态

        //确保图片的翻转过程一直处于组件的中心点位置
       //preTranslate是指在setScale前,平移,postTranslate是指在setScale后平移
       //以图片的中心点为旋转中心,如果不加这两句，就是以（0,0）点为旋转中心
        matrix.preTranslate(-centerX, -centerY);
        matrix.postTranslate(centerX, centerY);
    }

    /** 动画进度监听器。 */
    public static interface InterpolatedTimeListener {
        public void interpolatedTime(float interpolatedTime);
    }
}