實現了一個類似Windows進度條效果，界面上有三個圓圈，依次有一個圓圈顯示白色，其它的圓圈顯示藍色。

畫圓圈的View

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.util.AttributeSet;

import android.view.View;

/**

* 畫圓圈的組件

*

* @author linweidong

* @date 2010-11-05

*/

public class Circle extends View {

public Circle(Context context) {

super(context);

// TODO Auto-generated constructor stub

}

public Circle(Context context, AttributeSet attrs) {

super(context, attrs);

// TODO Auto-generated constructor stub

}

@Override

protected void onDraw(Canvas canvas) {

// TODO Auto-generated method stub

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

if (StaticString.circleColor == Color.BLUE) {

paint.setColor(Color.BLUE);

} else if (StaticString.circleColor == Color.WHITE) {

paint.setColor(Color.WHITE);

}

paint.setAntiAlias(true);

paint.setStyle(Style.FILL);

canvas.drawCircle(4, 4, 4.0f, paint);??//注意圓心的位置

super.onDraw(canvas);

}

}

在使用圓圈的Activity的XML上加載圓圈組件

android:id="@+id/circle1" android:layout_width="8dip"

android:layout_marginTop="6dip" android:padding="4dip"

android:layout_height="8dip" />

android:id="@+id/circle2" android:layout_width="8dip"

android:layout_marginTop="6dip" android:layout_marginLeft="2dip"

android:padding="4dip" android:layout_height="8dip" />

android:id="@+id/circle3" android:layout_width="8dip"

android:layout_marginTop="6dip" android:layout_marginLeft="2dip"

android:padding="4dip" android:layout_height="8dip" />

android:padding="4dip" 提供半徑為4?畫圓圈的空間，如果android:layout_width="wrap_content "會占很大空間，因此限定大小

在相關的Activity使用

mCityCircle1 = (View) findViewById(R.id.circle1);

mCityCircle2 = (View) findViewById(R.id.circle2);

mCityCircle3 = (View) findViewById(R.id.circle3);

class CircleThread implements Runnable {

public void run() {

int count = 0;

while (true) {

try {

count++;

if (count % 3 == 0) {

Thread.sleep(100);

StaticString.circleColor = Color.WHITE;

mCityCircle1.postInvalidate();

Thread.sleep(100);

StaticString.circleColor = Color.BLUE;

mCityCircle2.postInvalidate();

Thread.sleep(100);

StaticString.circleColor = Color.BLUE;

mCityCircle3.postInvalidate();

} else if (count % 3 == 1) {

Thread.sleep(100);

StaticString.circleColor = Color.BLUE;

mCityCircle1.postInvalidate();

Thread.sleep(100);

StaticString.circleColor = Color.WHITE;

mCityCircle2.postInvalidate();

Thread.sleep(100);

StaticString.circleColor = Color.BLUE;

mCityCircle3.postInvalidate();

} else {

Thread.sleep(100);

StaticString.circleColor = Color.BLUE;

mCityCircle1.postInvalidate();

Thread.sleep(100);

StaticString.circleColor = Color.BLUE;

mCityCircle2.postInvalidate();

Thread.sleep(100);

StaticString.circleColor = Color.WHITE;

mCityCircle3.postInvalidate();

}

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}?}

總結

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