android animation应用——图片绕固定点旋转

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一、功能：实现将图片绕固定点旋转，圈数随机，onTouch后旋转。

二、程序框架：

组成功能主Activity：MyActivity1.实现animation
2.实现onTouchView ：MyView1.将突破绘制到MyView上三、程序源代码：

MyVIew.java

package com.androids.kavinapps.myapplication;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.drawable.BitmapDrawable;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.view.animation.Animation;import android.view.animation.RotateAnimation;/** * Created by Administrator on 14-11-29. */public class MyView extends View{    //define roate animatioin    public Animation mAnimationRoate;    //define bitmap object    Bitmap mBitmap = null;    public MyView(Context context) {        super(context);        //load resource        mBitmap = ((BitmapDrawable)getResources().getDrawable(com.androids.kavinapps.myapplication.R.drawable.choujiang1)).getBitmap();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Paint mPaint = null;        //draw pic        canvas.drawBitmap(mBitmap,0,40,null);    }}

MyActivity.java

package com.androids.kavinapps.myapplication;import android.app.Activity;import android.graphics.drawable.AnimationDrawable;import android.os.Bundle;import android.os.Message;import android.os.Handler;//Handlerimport android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.MotionEvent;import android.view.View;import android.view.animation.Animation;import android.view.animation.RotateAnimation;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;public class MyActivity extends Activity {    AnimationDrawable mAnimation1 = null;    int mRandom = 1;//随机数    MyView myView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        myView = new MyView(this);        setContentView(myView);        mRandom = (int) (Math.random()*100);        if(mRandom%5==0){            mRandom = 5;        }else {            mRandom = mRandom%5;        }        myView.mAnimationRoate = new RotateAnimation(0.0f, +(1800.0f +72*mRandom), Animation.RELATIVE_TO_PARENT, 0.5f, Animation.RELATIVE_TO_PARENT, 0.5f);        //set the time of anim        myView.mAnimationRoate.setDuration(3000);        myView.mAnimationRoate.setFillAfter(true);//动画完成后不恢复原状        myView.startAnimation(myView.mAnimationRoate);    }//onCreate    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                mRandom = (int) (Math.random()*100);                if(mRandom%5==0){                    mRandom = 5;                }else {                    mRandom = mRandom%5;                }                myView.mAnimationRoate = new RotateAnimation(0.0f, +(1800.0f +72*mRandom), Animation.RELATIVE_TO_PARENT, 0.5f, Animation.RELATIVE_TO_PARENT, 0.5f);                myView.mAnimationRoate.setDuration(3000);                myView.mAnimationRoate.setFillAfter(true);//动画完成后不恢复原状                myView.startAnimation(myView.mAnimationRoate);                return true;        }        return true;    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.my, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}

四、部分代码分析

1.如何产生随机数

mRandom = (int) (Math.random()*100);

2.如何使动画完成后，不恢复原装填

myView.mAnimationRoate.setFillAfter(true);//动画完成后不恢复原状

3.如何将drawable下的图片文件变为Bitmap

mBitmap = ((BitmapDrawable)getResources().getDrawable(com.androids.kavinapps.myapplication.R.drawable.choujiang1)).getBitmap();

2014年12月9日14:41:34

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