android自定义button点击效果

package com.min.androidtest;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;

public class AndroidTest extends Activity {
private static final String TAG = "AndroidTest";

private static LinearLayout ll;
private Button mBtn;
private MyView mMyView;
private boolean mbClickFlg = false;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.main);

// 设置画面布局
ll = new LinearLayout(this.getBaseContext());
ll.setOrientation(LinearLayout.VERTICAL);

// button
mBtn = new Button(this.getBaseContext());
mBtn.setText("Draw");
//
mBtn.setTextColor(0xff000000);
mBtn.setTextSize(16);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

lp.topMargin = 5;
lp.leftMargin = 5;
ll.addView(mBtn, lp);

// 设置画图view
LinearLayout.LayoutParams lp1 = new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
lp1.weight = 1;
Rect rect = new Rect(10, 40, 90, 66);
mMyView = new MyView(this.getBaseContext(), rect);
mMyView.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
Log.d(TAG, "mMyView clicked.");
if (mbClickFlg) {
mMyView.setStrText("Click Me");
} else {
mMyView.setStrText("Again...");
}
mbClickFlg = !mbClickFlg;
mMyView.postInvalidate();
}

});

ll.addView(mMyView, lp1);
setContentView(ll);

// 设置监听按钮点击事件
mBtn.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
mMyView.drawLine();
mMyView.postInvalidate();
}

});

}

// 自定义画图类，继承自View类
public class MyView extends View {
private Paint paint;
private boolean bDrawLineFlg = false;
private Rect mRect;
private String mStrText = "having";

MyView(Context context) {
super(context);
// 生成paint
paint = new Paint();
}

MyView(Context context, Rect rect) {
super(context);
// 生成paint
paint = new Paint();
mRect = rect;
}

@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);

// 填充整个画布
canvas.drawColor(Color.GRAY);
// canvas.drawRGB(255, 255, 255); // 也可以

// 画图
if (bDrawLineFlg) {
Log.d(TAG, "drawing");

// Draw top 6 lines
paint.setColor(0xFFFFC0CB);
canvas.drawLine(mRect.left + 2, mRect.top, mRect.right - 2, mRect.top, paint);
canvas.drawLine(mRect.left + 1, mRect.top + 1, mRect.right -1, mRect.top + 1, paint);
for (int i = 2; i < 6; i++) {
canvas.drawLine(mRect.left, mRect.top + i, mRect.right, mRect.top + i, paint);
}

// Draw middle 14 lines
paint.setColor(0xFFFFB6C1);
for (int i = 6; i < 20; i++) {
canvas.drawLine(mRect.left, mRect.top + i, mRect.right, mRect.top + i, paint);
}

// Draw bottom 6 lines
paint.setColor(0xFFFFC0CB);
for (int i = 20; i < 24; i++) {
canvas.drawLine(mRect.left, mRect.top + i, mRect.right, mRect.top + i, paint);
}
canvas.drawLine(mRect.left + 1, mRect.top + 24, mRect.right - 1, mRect.top + 24, paint);
canvas.drawLine(mRect.left + 2, mRect.top + 25, mRect.right - 2, mRect.top + 25, paint);

// draw text
paint.setColor(0xFF0000FF);
paint.setTextSize(16);
paint.setAntiAlias(true); // 消除锯齿
paint.setFlags(Paint.ANTI_ALIAS_FLAG); // 消除锯齿
try{
float widths[] = new float[mStrText.length()];
paint.getTextWidths(mStrText, widths);
float textWidth = 0.0f;
for(int i = 0; i < widths.length; i++) {
textWidth += widths[i];
Log.d(TAG, "widths[0] = " + widths[i]);
}
Log.d(TAG, "textWidth = " + textWidth);
float textSize = paint.getTextSize();
Log.d(TAG, "textSize = " + textSize);
canvas.drawText(mStrText,
mRect.left + (mRect.width() - textWidth) / 2,
mRect.bottom - (mRect.height() - textSize) / 2 - 3, // add offset to y position
paint);
} catch(Exception e) {
e.printStackTrace();
}
}

}

public void drawLine() {
// 设置画线标志
bDrawLineFlg = !bDrawLineFlg;
if (bDrawLineFlg) {
mBtn.setText("Hide");
} else {
mBtn.setText("Draw");
}
Log.d(TAG, "to be draw");
}

public void setStrText(String text) {
mStrText = text;
}
}
}