Android View转换成图片保存

import java.io.File;  
import java.io.FileOutputStream;  
  
import android.os.Bundle;  
import android.os.Environment;  
import android.os.Handler;  
import android.view.View;  
import android.widget.Button;  
import android.widget.TextView;  
import android.app.Activity;  
import android.graphics.Bitmap;  
import android.graphics.Canvas;  
import android.graphics.Color;  
import android.graphics.Paint;  
  
/** 
 * 把Android的一个View转换成图片保存 
 *  
 * */  
  
public class MainActivity extends Activity {  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
  
        final TextView tv = (TextView) findViewById(R.id.textView);  
        tv.setBackgroundColor(Color.GREEN);  
        // tv.setDrawingCacheEnabled(true);  
  
        final Runnable runnable = new Runnable() {  
            @Override  
            public void run() {  
                viewSaveToImage(tv);  
            }  
        };  
  
        Button button = (Button) findViewById(R.id.button);  
        button.setOnClickListener(new View.OnClickListener() {  
  
            @Override  
            public void onClick(View v) {  
                new Handler().post(runnable);  
            }  
        });  
  
    }  
  
    public void viewSaveToImage(View view) {  
        view.setDrawingCacheEnabled(true);  
        view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);  
        view.setDrawingCacheBackgroundColor(Color.WHITE);  
  
        // 把一个View转换成图片  
        Bitmap cachebmp = loadBitmapFromView(view);  
  
        // 添加水印  
        Bitmap bitmap = Bitmap.createBitmap(createWatermarkBitmap(cachebmp,"@ Zhang Phil"));  
  
        FileOutputStream fos;  
        try {  
            // 判断手机设备是否有SD卡  
            boolean isHasSDCard = Environment.getExternalStorageState().equals(  
                    android.os.Environment.MEDIA_MOUNTED);  
            if (isHasSDCard) {  
                // SD卡根目录  
                File sdRoot = Environment.getExternalStorageDirectory();  
                File file = new File(sdRoot,"test.PNG");  
                fos = new FileOutputStream(file);  
            } else  
                throw new Exception("创建文件失败!");  
  
            bitmap.compress(Bitmap.CompressFormat.PNG,90,fos);  
  
            fos.flush();  
            fos.close();  
  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
  
        view.destroyDrawingCache();  
    }  
  
    private Bitmap loadBitmapFromView(View v) {  
        int w = v.getWidth();  
        int h = v.getHeight();  
  
        Bitmap bmp = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888);  
        Canvas c = new Canvas(bmp);  
  
        c.drawColor(Color.WHITE);  
        /** 如果不设置canvas画布为白色，则生成透明 */  
  
        v.layout(0,w,h);  
        v.draw(c);  
  
        return bmp;  
    }  
  
    // 为图片target添加水印  
    private Bitmap createWatermarkBitmap(Bitmap target,String str) {  
        int w = target.getWidth();  
        int h = target.getHeight();  
  
        Bitmap bmp = Bitmap.createBitmap(w,Bitmap.Config.ARGB_8888);  
        Canvas canvas = new Canvas(bmp);  
  
        Paint p = new Paint();  
  
        // 水印的颜色  
        p.setColor(Color.RED);  
  
        // 水印的字体大小  
        p.setTextSize(16);  
  
        p.setAntiAlias(true);// 去锯齿  
  
        canvas.drawBitmap(target,p);  
  
        // 在中间位置开始添加水印  
        canvas.drawText(str,w / 2,h / 2,p);  
  
        canvas.save(Canvas.ALL_SAVE_FLAG);  
        canvas.restore();  
  
        return bmp;  
    }  
}