如圖,在按鈕上實現帶有個性圖片的按鈕,可通過複寫按鈕類來實現。
package moyan.standopen; import android.annotation.SuppressLint; import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.RectF; import android.util.AttributeSet; import android.view.MotionEvent; import android.widget.Button; @SuppressLint("ParserError") public class mybutton extends Button{ private Paint margainPaint; private Paint linePaint; private int paperColor; private float margain; private Bitmap bmp; public mybutton(Context context) { super(context); // TODO Auto-generated constructor stub } public mybutton(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub init(); } public mybutton(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub init(); } @Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub //處理按鈕按下後的效果 if(event.getAction()==MotionEvent.ACTION_DOWN) { linePaint=new Paint(Paint.ANTI_ALIAS_FLAG); linePaint.setColor(Color.GRAY); } if(event.getAction()==MotionEvent.ACTION_UP) { linePaint=new Paint(Paint.ANTI_ALIAS_FLAG); linePaint.setColor(Color.WHITE); } invalidate(); return super.onTouchEvent(event); } public void init() { Resources mtRes=getResources(); bmp=BitmapFactory.decodeResource(mtRes, R.drawable.head_01); margainPaint=new Paint(Paint.ANTI_ALIAS_FLAG); margainPaint.setColor(Color.BLACK); linePaint=new Paint(Paint.ANTI_ALIAS_FLAG); linePaint.setColor(Color.WHITE); paperColor=Color.WHITE; } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub //canvas.drawColor(paperColor); //canvas.drawRect(10, 0, getMeasuredHeight(), getMeasuredHeight(), linePaint); linePaint.setAntiAlias(true); RectF oval3 = new RectF(0, 0,getMeasuredWidth(), getMeasuredHeight()); canvas.drawRoundRect(oval3, 5, 5, linePaint);//畫按鈕的形狀爲圓角矩形 canvas.drawText(">",getMeasuredWidth()-30,getMeasuredHeight()/2,margainPaint); Rect rect=new Rect(2,2,getMeasuredHeight()-2,getMeasuredHeight()-2); canvas.drawBitmap(bmp,null, rect, linePaint);//畫圖片 canvas.save(); canvas.translate(30, 0); super.onDraw(canvas); canvas.restore(); } @Override public boolean isPressed() { // TODO Auto-generated method stub return super.isPressed(); } public void SetBmp(int bitmap) { //在程序中調用,用來設置每個按鈕的圖片 Resources mtRes=getResources(); bmp=BitmapFactory.decodeResource(mtRes,bitmap); invalidate(); } }
在佈局中的調用:
<moyan.standopen.mybutton android:id="@+id/first" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/love" android:layout_marginLeft="50dip" android:layout_marginRight="50dip" android:textSize="12pt" android:gravity="center" android:paddingRight="30dip" android:layout_above="@id/center" android:layout_marginBottom="20dip" />
最後在程序中定義mybutton的對象,通過調用SetBmp()函數來設置圖片。