Android 将View 转化为bitmap 图片

原理 将view利用canvas画到bitmap 上，然后对bitmap进行后续的操作可以保存为png或者jpeg,我想要进行灰度处理但是没有去实现。

package com.garea.plugin.report.detail.print;

import android.annotation.SuppressLint;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.os.Environment;
import android.view.View;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Created by yuankaifeng on 7/7/16.
 */
@SuppressLint("NewApi") public class BitmapUtils {


    private static Bitmap view2Bitmap(View view, int bitmapWidth, int bitmapHeight){
        Bitmap bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.RGB_565);//Bitmap.Config.ARGB_8888
        view.draw(new Canvas(bitmap));
        return bitmap;
    }

    private static String  writeBitmapToSDcard(String path ,String fileName ,Bitmap bitmap,int compress){
//        String strPath ="/testSaveView/"+ UUID.randomUUID().toString()+".png";
        String strPath = path+"/"+fileName;
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            File sdCardDir=Environment.getExternalStorageDirectory();
            FileOutputStream fos = null;
            try{
                File file = new File(sdCardDir,strPath);
                if (!file.getParentFile().exists()) {
                    file.getParentFile().mkdirs();
                }
                fos = new FileOutputStream(file);

                //当指定压缩格式为PNG时保存下来的图片显示正常
                bitmap.compress(Bitmap.CompressFormat.PNG, compress, fos);
                //当指定压缩格式为JPEG时保存下来的图片背景为黑色
                //bitmap.compress(CompressFormat.JPEG, 100, fos);
                fos.flush();
            }catch(Exception e){
                e.printStackTrace();
            }finally{
                try {
                    bitmap.recycle();//释放掉bitmap
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return  strPath;
        }
        return  null;
    }


    public static  String view2PNG( View view,String path ,String fileName ,int compress){
        Bitmap bitmap = view2Bitmap(view,view.getMeasuredWidth(),view.getMeasuredHeight());
        if(bitmap == null){
            return  null;
        }
        return writeBitmapToSDcard(path,fileName,bitmap,compress);
        
    }
}

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上面是工具类

使用很简单

String filePath  = BitmapUtils.view2PNG(view, "/aaa", "view.png", 100); 给他传入你想要传化为图片的View   和路径

就可以到对应的路径下面去看图片是否存在了