拼图代码-两张图片拼接

拼图代码——两张图片拼接：

onCreate函数：

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageview=(ImageView) findViewById(R.id.imageview);
        Bitmap background=BitmapFactory.decodeResource(getResources(), R.drawable.back);
        Bitmap foreground=BitmapFactory.decodeResource(getResources(), R.drawable.plane);

        /*Canvas canvas=new Canvas(background);
        drawImage(canvas, background, 0, foreground.getHeight(),
        		foreground.getWidth(), background.getHeight()/2, 0, 0);*/

        Bitmap bitmap=toConformBitmap(background, foreground);
        imageview.setImageBitmap(bitmap);
    }

拼接函数：

方法一：

<span style="font-size:18px;">    private Bitmap toConformBitmap(Bitmap background, Bitmap foreground){
	if(background==null){
		return null;
	}
	int bgWidth=background.getWidth();
	int bgHeight=background.getHeight();
	int fgWidth=foreground.getWidth();
	int fgHeight=foreground.getHeight();
	//创建一个新的和SRC长度宽度一样的位图
	Bitmap newbmp=Bitmap.createBitmap(bgWidth+fgWidth, bgHeight+fgHeight, Config.ARGB_8888);
    	Canvas cv=new Canvas(newbmp);
    	cv.drawBitmap(background, 0, 0, null);//在0，0坐标开始画bg
    	cv.drawBitmap(foreground, 0, bgHeight, null);//在0,0坐标开始画fg，可以从任意位置画入

    	cv.save(Canvas.ALL_SAVE_FLAG);//保存
    	cv.restore();//存储

    	return newbmp;
    }</span>

方法二：

<span style="font-size:18px;">    private Bitmap toConformBitmap(Bitmap background, Bitmap foreground){
	if(background==null){
	<span style="white-space:pre">	</span>return null;
	}
	int bgWidth=background.getWidth();
	int bgHeight=background.getHeight();
	int fgWidth=foreground.getWidth();
	int fgHeight=foreground.getHeight();
	//创建一个新的和SRC长度宽度一样的位图
	Bitmap newbmp=Bitmap.createBitmap(bgWidth+fgWidth, bgHeight+fgHeight, Config.ARGB_8888);
    	Canvas cv=new Canvas(newbmp);

    	//方法二
    	Rect dst=new Rect();
    	dst.left=0;
    	dst.top=0;
    	dst.right=bgWidth;
    	dst.bottom=bgHeight-50;
    	cv.drawBitmap(background, null, dst, null);

    	Rect dst2=new Rect();
    	dst2.left=0;
    	dst2.top=bgHeight;
    	double Xscale=bgWidth/fgWidth;//X轴缩放比例
    	dst2.bottom=(int) (bgHeight+fgHeight*Xscale);
    	dst2.right=bgWidth;
    	cv.drawBitmap(foreground, null, dst2, null);

    	dst2=null;
    	dst=null;

    	cv.save(Canvas.ALL_SAVE_FLAG);//保存
    	cv.restore();//存储

    	return newbmp;
    }</span>

保存函数：

    //保存bitmap为一张图片
    private String saveBitmap(Bitmap bitmap){
    	String imagePath=getApplication().getFilesDir().getAbsolutePath()+"/temp.jpg";
    	File file=new File(imagePath);
    	if(file.exists()){
    		file.delete();
    	}
    	try {
			FileOutputStream out=new FileOutputStream(file);
			if(bitmap.compress(Bitmap.CompressFormat.PNG, 100, out)){
				out.flush();
				out.close();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			Toast.makeText(this, "保存失败", 1).show();

			e.printStackTrace();
		}

		return imagePath;

    }