android中自定义Button，设置不同背景图片。

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1、自定义MyButton类

public class MyButton extends Button {

//This constructormust be

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

public MyButton(Context context) {
super(context);
}

private Paint mPaint = null;
private String mText;
private int mX, mY;

public void onSetText(String text, int nLeft, int nBottom, int nTextSize,
int nTextColor) {
mPaint = new Paint();
mPaint.setTextSize(nTextSize);
mPaint.setColor(nTextColor);
this.mText = text;
this.mX = nLeft;
this.mY = nBottom;
}

private int mDownBmpId, mUpBmpId;

public void onSetBmp(int nDownID, int nUpID) {
this.mDownBmpId = nDownID;
this.mUpBmpId = nUpID;
}

@Override
public void onDraw(Canvas canvas) {

if (mPaint != null)
canvas.drawText(mText, mX, mY, mPaint);
super.onDraw(canvas);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
super.setBackgroundResource(mDownBmpId);
} else if (event.getAction() == MotionEvent.ACTION_UP) {
super.setBackgroundResource(mUpBmpId);
}
return super.onTouchEvent(event);
}
}

2、在xml布局文件中添加MyButton控件，像应用普通的Button控件一样。

<com.MyButton
android:id="@+id/test_btn" android:layout_width="120px"
android:layout_height="fill_parent" android:text="Test"
android:background="@drawable/btn_u" />

其中com.MyButton是你定义的MyButton类所在的包名

3、在onCreate()中加载MyButton控件。

MyButton btn= (MyButton)findViewById(R.id.test_btn);
btn.onSetBmp(R.drawable.btn_d, R.drawable.btn_u);

其中btn_d表示为按下btn时背景图片，btn_u为默认状态下btn背景图片

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