Android methods for customizing Button and setting different background images

This article shows how Android can customize Button and set different background images. To share for your reference, the details are as follows:

1. Custom MyButton class

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. Add MyButton control to the xml layout file, just like applying normal Button control 1.

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

com. MyButton is the package name where you define the MyButton class

3. Load MyButton controls in onCreate().

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

btn_d is the background image when btn is pressed, and btn_u is the default background image of btn

For more information about Android controls, please visit our special topic: Summary of Android Controls usage.

I hope this article has been helpful in Android programming.