Android之自定义view(demo1)
下面是一个简单的自定义view：
效果图：
首先建一个类继承view：
<span style="font-size:18px;">package com.aigestudio.customviewdemo.views;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
/**
* 自定义View
*
* @author Aige
* @since 2014/11/17
*/
public class CustomView extends View implements Runnable {
private Paint mPaint;// 画笔
private Context mContext;// 上下文环境引用
private int radiu;// 圆环半径
public CustomView(Context context) {
this(context, null);
}
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
// 初始化画笔
initPaint();
}
/**
* 初始化画笔
*/
private void initPaint() {
// 实例化画笔并打开抗锯齿
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
/*
* 设置画笔样式为描边，圆环嘛……当然不能填充不然就么意思了
*
* 画笔样式分三种：
* 1.Paint.Style.STROKE：描边
* 2.Paint.Style.FILL_AND_STROKE：描边并填充
* 3.Paint.Style.FILL：填充
*/
mPaint.setStyle(Paint.Style.STROKE);
// 设置画笔颜色为紅色
mPaint.setColor(Color.RED);
/*
* 设置描边的粗细，单位：像素px
* 注意：当setStrokeWidth(0)的时候描边宽度并不为0而是只占一个像素
*/
mPaint.setStrokeWidth(10);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// 绘制圆环
canvas.drawCircle(MeasureUtil.getScreenSize((Activity) mContext)[0] / 2, MeasureUtil.getScreenSize((Activity) mContext)[1] / 2, radiu, mPaint);
}
@Override
public void run() {
/*
* 确保线程不断执行不断刷新界面
*/
while (true) {
try {
/*
* 如果半径小于200则自加否则大于200后重置半径值以实现往复
*/
if (radiu <= 200) {
radiu += 10;
// 刷新View
postInvalidate();
} else {
radiu = 0;
}
// 每执行一次暂停40毫秒
Thread.sleep(40);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
</span>
布局就直接引入自己定义的布局就好了。
然后是MainActivity:
<span style="font-size:18px;">package com.aigestudio.customviewdemo.activities;
import android.app.Activity;
import android.os.Bundle;
import com.aigestudio.customviewdemo.R;
import com.aigestudio.customviewdemo.views.CustomView;
public class MainActivity extends Activity {
private CustomView mCustomView;// 我们的自定义View
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 获取控件
mCustomView = (CustomView) findViewById(R.id.main_cv);
/*
* 开线程
*/
new Thread(mCustomView).start();
}
}
</span>
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