android 属性动画

package com.example.ceshi;



import android.os.Build;
import android.os.Bundle;
import android.animation.IntEvaluator;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.util.Log;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.view.ViewTreeObserver.OnPreDrawListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

@SuppressLint("NewApi")
public class MainActivity extends Activity  {
    public Webservice webServiceManager;
    private EditText indata;
    private TextView show;
    private Button click;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        indata = (EditText)findViewById(R.id.indata);
        show = (TextView)findViewById(R.id.show);    
        
        click = (Button)findViewById(R.id.click);
        click.setOnClickListener(new Click1());    
        
    }
    
    


    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        // TODO Auto-generated method stub
        Log.e("---","onWindowFocusChanged"+click.getLayoutParams().width);
        super.onWindowFocusChanged(hasFocus);
    }




    //自定义toast 弹出的位置
    class Click1 implements OnClickListener{

        @Override
        public void onClick(View v) {
            Toast toast = Toast.makeText(getApplicationContext(), "自定义位置", Toast.LENGTH_LONG);
            //居中
            toast.setGravity(Gravity.CENTER, 0, 0);
            
            toast.show();
            performAnimate2(click, click.getWidth(), 500);
            performAnimate3(click, click.getHeight(), 200);
        }
        
    }
    
    //自定义toast 弹出的位置带有图片的
        class Click2 implements OnClickListener{

            @Override
            public void onClick(View v) {
                Toast toast = Toast.makeText(getApplicationContext(), "自定义位置", Toast.LENGTH_LONG);
                //居中
                toast.setGravity(Gravity.CENTER, 0, 0);
                LayoutInflater inflater=  LayoutInflater.from(MainActivity.this);
                View view = inflater.inflate(R.layout.add, null);
                toast.setView(view);
                toast.show();
            }
            
        }
    

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

    private void performAnimate() {  
        ViewWrapper wrapper = new ViewWrapper(click);  
        ObjectAnimator.ofInt(wrapper, "width", 500).setDuration(5000).start();  
        ObjectAnimator.ofInt(wrapper, "width", 120).setDuration(5000).start(); 
    }  

    
    private static class ViewWrapper {  
        private View mTarget;  
      
        public ViewWrapper(View target) {  
            mTarget = target;  
        }  
      
        public int getWidth() {  
            Log.e("---","---->>>>>"+mTarget.getLayoutParams().width);
            return mTarget.getLayoutParams().width;  
        }  
      
        public void setWidth(int width) {  
            mTarget.getLayoutParams().width = width;  
            mTarget.requestLayout();  
        }  
    }
    
    private void performAnimate2(final View target, final int start, final int end) {  
        ValueAnimator valueAnimator = ValueAnimator.ofInt(1, 100);  
      
        valueAnimator.addUpdateListener(new AnimatorUpdateListener() {  
      
            //持有一个IntEvaluator对象，方便下面估值的时候使用  
            private IntEvaluator mEvaluator = new IntEvaluator();  
      
            @Override  
            public void onAnimationUpdate(ValueAnimator animator) {  
                //获得当前动画的进度值，整型，1-100之间  
                int currentValue = (Integer)animator.getAnimatedValue();  
                Log.e("----", "current value: " + currentValue);  
      
                //计算当前进度占整个动画过程的比例，浮点型，0-1之间  
                float fraction = currentValue / 100f;  
      
                //这里我偷懒了，不过有现成的干吗不用呢  
                //直接调用整型估值器通过比例计算出宽度，然后再设给Button  
                target.getLayoutParams().width = mEvaluator.evaluate(fraction, start, end);  
                target.requestLayout();  
            }  
        });  
      
        valueAnimator.setDuration(5000).start();  
    }  
    private void performAnimate3(final View target, final int start, final int end) {  
        ValueAnimator valueAnimator = ValueAnimator.ofInt(1, 100);  
      
        valueAnimator.addUpdateListener(new AnimatorUpdateListener() {  
      
            //持有一个IntEvaluator对象，方便下面估值的时候使用  
            private IntEvaluator mEvaluator = new IntEvaluator();  
      
            @Override  
            public void onAnimationUpdate(ValueAnimator animator) {  
                //获得当前动画的进度值，整型，1-100之间  
                int currentValue = (Integer)animator.getAnimatedValue();  
                Log.e("----", "current value: " + currentValue);  
      
                //计算当前进度占整个动画过程的比例，浮点型，0-1之间  
                float fraction = currentValue / 100f;  
      
                //这里我偷懒了，不过有现成的干吗不用呢  
                //直接调用整型估值器通过比例计算出宽度，然后再设给Button  
                target.getLayoutParams().height = mEvaluator.evaluate(fraction, start, end);  
                target.requestLayout();  
            }  
        });  
      
        valueAnimator.setDuration(5000).start();  
    }  
}

来自 ： http://blog.csdn.net/singwhatiwanna/article/details/17841165