为照片添加水印

Question

哦，我的第一个问题〜
这里是我的problem.I'm提出申请拍照和水印添加到它。
第一步，作为应用程序启动，我采取了一枪（使用最大分辨率，like2592 * 1952年（500万））。拍摄完成后，我按OK返回到我的应用程序的视图，应用程序崩溃。但是，如果我应用程序启动的分辨率不是那么大（比如3M，2M，1M），那么它可以正常工作。然后，第二个镜头的分辨率为5M，它可能很有趣办法。 我很困惑，任何人都可以帮助我吗？ 下面是关于解码图像文件的一些代码。

public void onClick(View v){ 
       Bitmap bitmap1 =mcreateBitmap(bitmaptmp, "watermark"); 
//    bitmaptmp=null; 
       /* Associate the Bitmap to the ImageView */ 
       if (bitmap1 != null) { 
        mImageView.setImageBitmap(bitmap1);     
       } 
       mImageView.setVisibility(View.VISIBLE); 
//    try { 
//     String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); 
//     String imageFileName = JPEG_FILE_PREFIX + timeStamp; 
//     saveMyBitmap(imageFileName,bitmap1); 
//     bitmap1=null; 
//    } catch (IOException e) { 
//     e.printStackTrace(); 
//    } 
      } 

公共位图mcreateBitmap（位图的src，字符串str）{

Time t = new Time(); 
    t.setToNow();  
    int w = src.getWidth(); 
    int h = src.getHeight(); 

    String mstrTitle = "11："+t.hour + ":" + t.minute + ":" + t.second; 
    String xx="34："+x; 
    String yy="44："+y;  
    Bitmap bmpTemp = Bitmap.createBitmap(w, h, Config.ARGB_8888); 

    Canvas canvas = new Canvas(bmpTemp); 
    Paint photoPaint = new Paint(); 
    photoPaint.setDither(true); 
    photoPaint.setFilterBitmap(true); 
    Rect s = new Rect(0, 0, src.getWidth(), src.getHeight()); 
    Rect d = new Rect(0, 0, w, h); 
    canvas.drawBitmap(src, s, d, photoPaint); 

    String familyName = "new"; 
    Typeface font = Typeface.create(familyName, Typeface.BOLD); 
    photoPaint.setColor(Color.BLUE); 
    photoPaint.setTypeface(font); 
    photoPaint.setTextSize(18); 
    canvas.drawText(mstrTitle,40, 20, photoPaint); 
    canvas.drawText(xx,40, 40, photoPaint); 
    canvas.drawText(yy,40, 60, photoPaint); 
    canvas.save(Canvas.ALL_SAVE_FLAG); 
    canvas.restore(); 

    return bmpTemp; 
} 

这里是logcat的：
十一月1日至5日：25：25.791：E/dalvikvm堆（11147）：20238336对于此过程，字节外部分配太大。 11月1日至5日：25：25.791：E/dalvikvm（11147）：内存：堆大小= 2923KB，分配= 2460KB，位图大小= 1235KB，极限= 13756KB 11月1日至5日：25：25.791：E/dalvikvm（11147）：修剪信息：足迹= 2883KB，允许的足迹= 3267KB，修剪= 344KB 01-05 11：25：25.791：E/GraphicsJNI（11147）：VM不会让我们分配20238336字节 01-05 11：25：25.801：d/AndroidRuntime（11147）：关闭VM 11月1日至五日：25：25.801：W/dalvikvm（11147）：线程ID = 1：螺纹与未捕获的异常退出（组= 0x40028a00） 01- 05 11：25：25.801：E/AndroidRuntime（11147）：致命异常：主 01-05 11：25：25.801：E/AndroidRuntime（11147）：java.lang.OutOfMemoryError：位图大小超过VM预算 01-05 11：25：25.801：E/AndroidRuntime（11147）：在android.graphics.Bitmap.nativeCreate（Nati已经方法） 11月1日至五日：25：25.801：E/AndroidRuntime（11147）：在android.graphics.Bitmap.createBitmap（Bitmap.java:574） 11月1日至五日：25：25.801：E/AndroidRuntime（11147 ）：at com.kevin.photowatermark.PhotowatermarkActivity.mcreateBitmap（PhotowatermarkActivity.java:403）

Answer 1

旧代码：

if ((targetW > 0) || (targetH > 0)) { 
     scaleFactor = Math.min(photoW/targetW, photoH/targetH); 

新代码：

if (photoH > IMAGE_MAX_SIZE || photoW> IMAGE_MAX_SIZE) { 
     scaleFactor = (int)Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE/(double) Math.max(photoH, photoW))/Math.log(0.5))); 

那么，它的工作原理没事。

Answer 2

对于解码文件，您应该使用以下方法。由于内存问题，您的问题发生。因此，使用以下方法解码您从相机设备捕获的图像（位图）。

package com.example.stackoverflow; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.math.BigInteger; 
import java.security.SecureRandom; 

import android.app.Activity; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.net.Uri; 
import android.os.Bundle; 
import android.os.Environment; 
import android.provider.MediaStore; 
import android.view.View; 
import android.widget.Button; 
import android.widget.GridView; 
import android.widget.ImageView; 

public class MyCameraActivity extends Activity { 
    private static final int CAMERA_REQUEST = 1888; 



    static String str_Camera_Photo_ImagePath = ""; 
    private static File f; 
    private static int Take_Photo = 2; 
    private static String str_randomnumber = ""; 
    static String str_Camera_Photo_ImageName = ""; 
    public static String str_SaveFolderName; 
    private static File wallpaperDirectory; 
    Bitmap bitmap; 
    int storeposition = 0; 
    public static GridView gridview; 
    public static ImageView imageView; 



    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.ccccc); 
     this.imageView = (ImageView)this.findViewById(R.id.imageView1); 
     Button photoButton = (Button) this.findViewById(R.id.button1); 
     photoButton.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       str_SaveFolderName = Environment 
         .getExternalStorageDirectory() 
         .getAbsolutePath() 
         + "/rajeshsample"; 
       str_randomnumber = String.valueOf(nextSessionId()); 
       wallpaperDirectory = new File(str_SaveFolderName); 
       if (!wallpaperDirectory.exists()) 
        wallpaperDirectory.mkdirs(); 
       str_Camera_Photo_ImageName = str_randomnumber 
         + ".jpg"; 
       str_Camera_Photo_ImagePath = str_SaveFolderName 
         + "/" + str_randomnumber + ".jpg"; 
       System.err.println(" str_Camera_Photo_ImagePath " 
         + str_Camera_Photo_ImagePath); 
       f = new File(str_Camera_Photo_ImagePath); 
       startActivityForResult(new Intent(
         MediaStore.ACTION_IMAGE_CAPTURE).putExtra(
         MediaStore.EXTRA_OUTPUT, Uri.fromFile(f)), 
         Take_Photo); 
       System.err.println("f " + f); 
      } 
     }); 
    } 


    // used to create randon numbers 
    public String nextSessionId() { 
     SecureRandom random = new SecureRandom(); 
     return new BigInteger(130, random).toString(32); 
    } 


    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == Take_Photo) { 
      String filePath = null; 

      filePath = str_Camera_Photo_ImagePath; 
      if (filePath != null) { 
       Bitmap faceView = (new_decode(new File(
           filePath))); // ========================> good 
               // lines 



       imageView.setImageBitmap(faceView); 

      } else { 
       bitmap = null; 
      } 
     } 
    } 

    public static Bitmap new_decode(File f) { 

     // decode image size 

     BitmapFactory.Options o = new BitmapFactory.Options(); 
     o.inJustDecodeBounds = true; 
     o.inDither = false; // Disable Dithering mode 

     o.inPurgeable = true; // Tell to gc that whether it needs free memory, 
           // the Bitmap can be cleared 

     o.inInputShareable = true; // Which kind of reference will be used to 
            // recover the Bitmap data after being 
            // clear, when it will be used in the future 
     try { 
      BitmapFactory.decodeStream(new FileInputStream(f), null, o); 
     } catch (FileNotFoundException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
     } 

     // Find the correct scale value. It should be the power of 2. 
     final int REQUIRED_SIZE = 300; 
     int width_tmp = o.outWidth, height_tmp = o.outHeight; 
     int scale = 1; 
     while (true) { 
      if (width_tmp/1.5 < REQUIRED_SIZE && height_tmp/1.5 < REQUIRED_SIZE) 
       break; 
      width_tmp /= 1.5; 
      height_tmp /= 1.5; 
      scale *= 1.5; 
     } 

     // decode with inSampleSize 
     BitmapFactory.Options o2 = new BitmapFactory.Options(); 
     // o2.inSampleSize=scale; 
     o.inDither = false; // Disable Dithering mode 

     o.inPurgeable = true; // Tell to gc that whether it needs free memory, 
           // the Bitmap can be cleared 

     o.inInputShareable = true; // Which kind of reference will be used to 
            // recover the Bitmap data after being 
            // clear, when it will be used in the future 
     // return BitmapFactory.decodeStream(new FileInputStream(f), null, o2); 
     try { 

//   return BitmapFactory.decodeStream(new FileInputStream(f), null, 
//     null); 
      Bitmap bitmap= BitmapFactory.decodeStream(new FileInputStream(f), null, null); 
      System.out.println(" IW " + width_tmp); 
      System.out.println("IHH " + height_tmp);   
       int iW = width_tmp; 
       int iH = height_tmp; 

       return Bitmap.createScaledBitmap(bitmap, iW, iH, true); 

     } catch (OutOfMemoryError e) { 
      // TODO: handle exception 
      e.printStackTrace(); 
      // clearCache(); 

      // System.out.println("bitmap creating success"); 
      System.gc(); 
      return null; 
      // System.runFinalization(); 
      // Runtime.getRuntime().gc(); 
      // System.gc(); 
      // decodeFile(f); 
     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      return null; 
     } 

    } 

}