Android 使用Canvas中的drawBitmap方法繪製拉伸的圖片
阿新 • • 發佈：2019-02-10
package com.vision.agriculture.classes.repository;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.widget.GridView
import com.vision.agriculture.R;
publicclassMyGridViewextendsGridView{
privateBitmap background;
publicMyGridView(Context context,AttributeSet attrs){
super(context, attrs);
background =BitmapFactory.decodeResource(getResources(),
R.drawable.repo_gridview_layer_bg);
}
@Override
protectedvoid layoutChildren(){
super.layoutChildren();
}
@Override
protectedvoid onMeasure(int widthMeasureSpec,intheightMeasureSpec){
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protectedvoid dispatchDraw(Canvas canvas){
int count = getChildCount();
int top = count >0? getChildAt(0).getTop
int backgroundWidth = background.getWidth();
int backgroundHeight = background.getHeight();
int width = getWidth();
int height = getHeight();
finalRect src =newRect();// 影象內的座標
src.left =0;
src.top =0;
src.right = backgroundWidth;
src.bottom = backgroundHeight;
for(int y = top; y < height; y += backgroundHeight){
RectF dst =newRectF();//螢幕
dst.left =0;
dst.top = y;
dst.right = width;
dst.bottom = y+backgroundHeight;
canvas.drawBitmap(background, src, dst,null);
}
super.dispatchDraw(canvas);
}
}
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.widget.GridView
import com.vision.agriculture.R;
publicclassMyGridViewextendsGridView{
privateBitmap background;
publicMyGridView(Context context,AttributeSet attrs){
super(context, attrs);
background =BitmapFactory.decodeResource(getResources(),
R.drawable.repo_gridview_layer_bg);
}
@Override
protectedvoid layoutChildren(){
super.layoutChildren();
}
@Override
protectedvoid onMeasure(int widthMeasureSpec,intheightMeasureSpec){
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protectedvoid dispatchDraw(Canvas canvas){
int count = getChildCount();
int top = count >0? getChildAt(0).getTop
int backgroundWidth = background.getWidth();
int backgroundHeight = background.getHeight();
int width = getWidth();
int height = getHeight();
finalRect src =newRect();// 影象內的座標
src.left =0;
src.top =0;
src.right = backgroundWidth;
src.bottom = backgroundHeight;
for(int y = top; y < height; y += backgroundHeight){
RectF dst =newRectF();//螢幕
dst.left =0;
dst.top = y;
dst.right = width;
dst.bottom = y+backgroundHeight;
canvas.drawBitmap(background, src, dst,null);
}
super.dispatchDraw(canvas);
}
}