Android地震波效果SeismicWaveView

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;

/**
*
* @ClassName: SeismicWaveView
* @Description: TODO(地震波效果)

*/
public class SeismicWaveView extends View {

private Paint paint;
private int maxWidth = 255;
private boolean isStarting = false;
private List alphaList = new ArrayList();
private List startWidthList = new ArrayList();

public SeismicWaveView(Context context) {
super(context);
init();
}

public SeismicWaveView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}

public SeismicWaveView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}

private void init() {
paint = new Paint();
paint.setColor(Color.RED);// 此处颜色可以改为自己喜欢的
alphaList.add("255");// 圆心的不透明度
startWidthList.add("0");
}

@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
setBackgroundColor(Color.TRANSPARENT);// 颜色：完全透明
// 依次绘制同心圆
for (int i = 0; i < alphaList.size(); i++) {
int alpha = Integer.parseInt(alphaList.get(i));
int startWidth = Integer.parseInt(startWidthList.get(i));
paint.setAlpha(alpha);
canvas.drawCircle(getWidth() / 2, getHeight() / 2, startWidth,
paint);
// 同心圆扩散
if (isStarting && alpha > 0 && startWidth < maxWidth) {
alphaList.set(i, (alpha - 1) + "");
startWidthList.set(i, (startWidth + 1) + "");
}
}
if (isStarting
&& Integer
.parseInt(startWidthList.get(startWidthList.size() - 1)) == maxWidth / 5) {
alphaList.add("255");
startWidthList.add("0");
}
// 同心圆数量达到6个，删除最外层圆
if (isStarting && startWidthList.size() == 6) {
startWidthList.remove(0);
alphaList.remove(0);
}
// 刷新界面
invalidate();
}

// 地震波开始/继续进行
public void start() {
isStarting = true;
}

// 地震波暂停
public void stop() {
isStarting = false;
}

public boolean isStarting() {
return isStarting;
}

}

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