本文实例讲述了Android自定义Button并设置不同背景图片的方法。分享给大家供大家参考,具体如下:
1、自定义MyButton类
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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。
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< 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。
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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
希望本文所述对大家Android程序设计有所帮助。