Android animation application-rotating images around Fixed Points

Android animation application-rotating images around Fixed Points

I. function: Rotate images around fixed points, with Random Number of circles and rotation after onTouch.

Ii. Program Framework:

Composition	Function
Main Activity: MyActivity	1. implement animation 2. onTouch implementation
View: MyView	1. Draw the breakthrough to MyView.

3. program source code:

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; // random number 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, + (18000000f + 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); // The animation is not restored to its original state. 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, + (18000000f + 72 * mRandom), Animation. RELATIVE_TO_PARENT, 0.5f, Animation. RELATIVE_TO_PARENT, 0.5f); myView. mAnimationRoate. setDuration (3000); myView. mAnimationRoate. setFillAfter (true); // The animation is not restored to its original state. startAnimation (myView. mAnimationRoate); 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 );}}

Iv. Code Analysis

1. How to generate a random number

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

2. How to Make the animation complete, do not restore the original fill

MyView. mAnimationRoate. setFillAfter (true); // The animation is not restored

3. How to change the image file under drawable to Bitmap

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

December 9, 2014 14:41:34