在Android中合并图像

Question

如何通过在java中编程合并android中的两个图像并保存在外部SD卡或其他地方。

Answer 1

尝试这个代码。

private static final String TAG = "JoinImage"; 
private Bitmap mBackImage, mTopImage, mBackground; 
private BitmapDrawable mBitmapDrawable; 
private static String mTempDir; 
private String mSavedImageName = null; 
private FileOutputStream mFileOutputStream = null; 
private Canvas mCanvas; 

在onCreate()

//Create folder in SDCard to store newly generated image 
mTempDir = Environment.getExternalStorageDirectory() + "/TestTemp/"; 
File mTempFile = new File(mTempDir); 
if(!mTempFile.exists()) { 
    mTempFile.mkdirs(); 
} 
//File name 
mSavedImageName = "Test.png"; 
//Width = 604, Height = 1024 Change as per your requirement 
mBackground = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888); 
//Put back and top images in your res folder 
mBackImage = BitmapFactory.decodeResource(getResources(), R.drawable.launcher); 
mTopImage = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); 

mCanvas = new Canvas(mBackground); 
mCanvas.drawBitmap(mBackImage, 0f, 0f, null); 
mCanvas.drawBitmap(mTopImage, 12f, 12f, null); 

try { 
    mBitmapDrawable = new BitmapDrawable(mBackground); 
    Bitmap mNewSaving = mBitmapDrawable.getBitmap(); 
    String FtoSave = mTempDir + mSavedImageName; 
    File mFile = new File(FtoSave); 
    mFileOutputStream = new FileOutputStream(mFile); 
    mNewSaving.compress(CompressFormat.PNG, 95, mFileOutputStream); 
    mFileOutputStream.flush(); 
    mFileOutputStream.close(); 
} catch(FileNotFoundException e) { 
    Log.e(TAG, "FileNotFoundExceptionError " + e.toString()); 
} catch(IOException e) { 
    Log.e(TAG, "IOExceptionError " + e.toString()); 
} 
Log.i(TAG, "Image Created"); 

在Manifest添加此使用的许可<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Answer 2

试试下面的代码

private Bitmap joinImages(File first, File second) 
{ 
    Bitmap bmp1, bmp2; 
    bmp1 = BitmapFactory.decodeFile(first.getPath()); 
    bmp2 = BitmapFactory.decodeFile(second.getPath()); 
    if (bmp1 == null || bmp2 == null) 
     return bmp1; 
    int height = bmp1.getHeight(); 
    if (height < bmp2.getHeight()) 
     height = bmp2.getHeight(); 

    Bitmap bmOverlay = Bitmap.createBitmap(bmp1.getWidth() + bmp2.getWidth(), height, Bitmap.Config.ARGB_8888); 
    Canvas canvas = new Canvas(bmOverlay); 
    canvas.drawBitmap(bmp1, 0, 0, null); 
    canvas.drawBitmap(bmp2, bmp1.getWidth(), 0, null); 
    return bmOverlay; 
}