这段时间一直都在看Android源码，当然在这里我就不说关于源码的问题，自我对其ANDROID4.0的观后感就是~比之前的2.2与2.3的都改进了好多，可能是我学疏才潜，在里面还有太多需要我去用时间来征服的节点，所以在这里就不敢自笔为是，所以就把简单的直接把API里的一些例子给搬出来，看看效果吧，一个一个的来，也顺便把里面的源码给直接贴出来，2011年虽然对我们来说是一个不可多得的一年，但是同样2012年更是让我们期待着跳越前栏的感觉，让我们共同展望2012年吧：
这个例子很简单，先看我截的几张图吧：
以上就是简单的动画截图，废话不多是了，看下源吗就知道，这里的源代码相对来说都很简单，我就不对齐解释了：
java代码:
package com.jsd.android4;
import com.jsd.android4.bouncing.BouncingBalls;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Android4_DemosActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init(){
Button mToBuncingBalls = (Button) findViewById(R.id.bouncingBalls);
mToBuncingBalls.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent mIt = new Intent();
mIt.setClass(Android4_DemosActivity.this,BouncingBalls.class);
startActivity(mIt);
}
});
}
}
package com.jsd.android4.bouncing;
import java.util.ArrayList;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ArgbEvaluator;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RadialGradient;
import android.graphics.Shader;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.widget.LinearLayout;
import com.jsd.android4.R;
/**
*
* @author jankey
*
*/
public class BouncingBalls extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.bouncing_balls);
LinearLayout container = (LinearLayout) findViewById(R.id.container);
container.addView(new MyAnimationView(this));
}
public class MyAnimationView extends View {
private static final int BLUE = 0xff8080FF;
private static final int RED = 0xffFF8080;
private static final int CYAN = 0xff80ffff;
private static final int GREEN = 0xff80ff80;
private static final int DURATION = 3000;
private static final float WIDTH = 50f;
private static final float HEIGHT = 50f;
public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
AnimatorSet animation = null;
public MyAnimationView(Context context) {
super(context);
ValueAnimator colorAnim = ObjectAnimator.ofInt(this,
"backgroundColor", BLUE, RED);
colorAnim.setDuration(DURATION);
colorAnim.setEvaluator(new ArgbEvaluator());
colorAnim.setRepeatCount(ValueAnimator.INFINITE);
colorAnim.setRepeatMode(ValueAnimator.REVERSE);
colorAnim.start();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() != MotionEvent.ACTION_DOWN
&& event.getAction() != MotionEvent.ACTION_MOVE) {
return false;
}
ShapeHolder newBall = addBall(event.getX(), event.getY());
float startY = newBall.getY();
float endY = getHeight() - 50f;
float h = (float) getHeight();
float eventY = event.getY();
int duration = (int) (500 * ((h - eventY) / h));
ValueAnimator bounceAnim = ObjectAnimator.ofFloat(newBall, "y",
startY, endY);
bounceAnim.setDuration(duration);
bounceAnim.setInterpolator(new AccelerateInterpolator());
ValueAnimator squashAnim1 = ObjectAnimator.ofFloat(newBall, "x",
newBall.getX(), newBall.getX() - 25f);
squashAnim1.setDuration(duration / 4);
squashAnim1.setRepeatCount(1);
squashAnim1.setRepeatMode(ValueAnimator.REVERSE);
squashAnim1.setInterpolator(new DecelerateInterpolator());
ValueAnimator squashAnim2 = ObjectAnimator.ofFloat(newBall,
"width", newBall.getWidth() + 50);
squashAnim2.setDuration(duration / 4);
squashAnim2.setRepeatCount(1);
squashAnim2.setRepeatMode(ValueAnimator.REVERSE);
squashAnim2.setInterpolator(new DecelerateInterpolator());
ValueAnimator stretchAnim1 = ObjectAnimator.ofFloat(newBall, "y",
endY, endY + 25f);
stretchAnim1.setDuration(duration / 4);
stretchAnim1.setRepeatCount(1);
stretchAnim1.setInterpolator(new DecelerateInterpolator());
stretchAnim1.setRepeatMode(ValueAnimator.REVERSE);
ValueAnimator stretchAnim2 = ObjectAnimator.ofFloat(newBall,
"height", newBall.getHeight(), newBall.getHeight() - 25);
stretchAnim2.setDuration(duration/4);
stretchAnim2.setRepeatCount(1);
stretchAnim2.setInterpolator(new DecelerateInterpolator());
stretchAnim2.setRepeatMode(ValueAnimator.REVERSE);
ValueAnimator bounceBackAnim = ObjectAnimator.ofFloat(newBall,"y",endY,startY);
bounceBackAnim.setDuration(duration);
bounceBackAnim.setInterpolator(new DecelerateInterpolator());
AnimatorSet bouncer = new AnimatorSet();
bouncer.play(bounceAnim).before(squashAnim1);
bouncer.play(squashAnim1).with(squashAnim2);
bouncer.play(squashAnim1).with(stretchAnim1);
bouncer.play(squashAnim1).with(stretchAnim2);
bouncer.play(bounceBackAnim).after(stretchAnim2);
ValueAnimator fadeAnim = ObjectAnimator.ofFloat(newBall,"alpha",1f,0f);
fadeAnim.setDuration(250);
fadeAnim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
balls.remove(((ObjectAnimator)animation).getTarget());
}
});
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.play(bouncer).before(fadeAnim);
animatorSet.start();
return true;
}
private ShapeHolder addBall(float x, float y) {
OvalShape circle = new OvalShape();
circle.resize(WIDTH, HEIGHT);
ShapeDrawable drawable = new ShapeDrawable(circle);
ShapeHolder shapeHolder = new ShapeHolder(drawable);
shapeHolder.setX(x - 25f);
shapeHolder.setY(y - 25f);
int red = (int) (Math.random() * 255);
int green = (int) (Math.random() * 255);
int blue = (int) (Math.random() * 255);
int color = 0xff000000 | red << 16 | green << 8 | blue;
Paint paint = drawable.getPaint();
int darkColor = 0xff000000 | red / 4 << 16 | green / 4 << 8 | blue
/ 4;
RadialGradient gradient = new RadialGradient(37.5f, 12.5f, 50f,
color, darkColor, Shader.TileMode.CLAMP);
paint.setShader(gradient);
shapeHolder.setPaint(paint);
balls.add(shapeHolder);
return shapeHolder;
}
@Override
protected void onDraw(Canvas canvas) {
for(int i = 0;i < balls.size();++i){
ShapeHolder shapeHolder = balls.get(i);
canvas.save();
canvas.translate(shapeHolder.getX(),shapeHolder.getY());
shapeHolder.getShape().draw(canvas);
canvas.restore();
}
}
}
}