android 入門-android自訂控制項

標籤：

第一種：繼承View

實現自己的屬性

  <com.cc.imagewithmarkersample.MyView        android:id="@+id/myviewid"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        SrcLT="@drawable/red"        SrcRT="@drawable/green"        SrcRB="@drawable/green"/>

public class MyView extends View {    //    private String mtext;    private int msrclt, msrcrt, msrcrb;    private static final String SrcLT = "SrcLT";    private static final String SrcRT = "SrcRT";    private static final String SrcRB = "SrcRB";    private static final int Canvas_W=150,Canvas_H=150;    private static final int Rect_W=100,Rect_H=100;    private Bitmap bitmap;    private int bitmap_W,bitmap_H;    private int LT_X=0,LT_Y=0;    private int RT_X=100,RT_Y=0;    private int RB_X=100,RB_Y=100;    private int Bitmap_X=25,Bitmap_Y=25;    private Rect mRect=null;    public MyView(Context context) {        super(context);    }    public MyView(Context context, AttributeSet attrs) {        super(context, attrs);//        int textId = attrs.getAttributeResourceValue(null, "Text",0);        int srcLeftTopId = attrs.getAttributeResourceValue(null, SrcLT, 0);        int srcRightTopId = attrs.getAttributeResourceValue(null, SrcRT, 0);        int srcRightBottomId = attrs.getAttributeResourceValue(null, SrcRB, 0);//        mtext = context.getResources().getText(textId).toString();        msrclt = srcLeftTopId;        msrcrt = srcRightTopId;        msrcrb = srcRightBottomId;        mRect=new Rect(Bitmap_X,Bitmap_Y,Rect_W+Bitmap_X,Rect_H+Bitmap_Y);    }    public void setImageBitmap(Bitmap bm) {        /** 擷取圖片寬高 **/        bitmap_W = bm.getWidth();        bitmap_H = bm.getHeight();        Bitmap_X=(Canvas_W-bitmap_W)/2;        Bitmap_Y=(Canvas_H-bitmap_H)/2;        if (bitmap != bm) {            bitmap=bm;        }    }    @Override    protected void onDraw(Canvas canvas) {        Paint paint = new Paint();        paint.setColor(Color.GRAY);        canvas.drawBitmap(bitmap, Bitmap_X, Bitmap_Y, paint);        paint.setAlpha(100);        canvas.drawRect(mRect,paint);        paint.setAlpha(255);        onDrawLt(canvas, paint);        onDrawRt(canvas, paint);        onDrawRb(canvas, paint);//        canvas.drawText(mtext, bw / 2, 30, paint);    }    private void onDrawLt(Canvas canvas, Paint paint) {        InputStream is = getResources().openRawResource(msrclt);        Bitmap mBitmap = BitmapFactory.decodeStream(is);        int bh = mBitmap.getHeight();        int bw = mBitmap.getWidth();        canvas.drawBitmap(mBitmap, LT_X, LT_Y, paint);    }    private void onDrawRt(Canvas canvas, Paint paint) {        InputStream is = getResources().openRawResource(msrcrt);        Bitmap mBitmap = BitmapFactory.decodeStream(is);        int bh = mBitmap.getHeight();        int bw = mBitmap.getWidth();        canvas.drawBitmap(mBitmap, RT_X, RT_Y, paint);    }    private void onDrawRb(Canvas canvas, Paint paint) {        InputStream is = getResources().openRawResource(msrcrb);        Bitmap mBitmap = BitmapFactory.decodeStream(is);        int bh = mBitmap.getHeight();        int bw = mBitmap.getWidth();        canvas.drawBitmap(mBitmap, RB_X, RB_Y, paint);    }}

 

android 入門-android自訂控制項