パスからちょうど画面の半分の大きさのBitmap画像を返すメソッド

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public static Bitmap getBitmapFromPath(Context context, String path) {
	//強制的にGC
	System.gc();
	
	//pathをURI変換
	File image_file = new File(path);
    final Uri image_uri = Uri.fromFile(image_file);
    Uri uri2 = fileUri2contentUri(context, image_uri);
    
    int deg = 0;
    
	Bitmap imageBitmap = null;
	Bitmap rotatedBitmap = null;
	try {
		ContentResolver contentResolver = context.getContentResolver();
		InputStream inputStream;
		BitmapFactory.Options imageOptions;

		// メモリ上に画像を読み込まず、画像サイズ情報のみを取得する
		inputStream = contentResolver.openInputStream(uri2);
		imageOptions = new BitmapFactory.Options();
		imageOptions.inJustDecodeBounds = true;
		BitmapFactory.decodeStream(inputStream, null, imageOptions);
		inputStream.close();
		
    	//画面サイズの取得
    	WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    	Display display = wm.getDefaultDisplay();
    	int view_width = (int)(display.getWidth() / 2);
    	int view_height = (int)(display.getHeight() / 2);

		//画像を縮小して読み込む
		inputStream = contentResolver.openInputStream(uri2);
		
	    // 画像の元サイズ  
	    final int height = imageOptions.outHeight;  
	    final int width = imageOptions.outWidth;  
	    int inSampleSize = 1;  
	  
	    if (height > view_height || width > view_width) {  
	        if (width > height) {  
	            inSampleSize = Math.round((float)height / (float)view_height);  
	        } else {  
	            inSampleSize = Math.round((float)width / (float)view_width);  
	        }  
	    }      		
		
		imageOptions = new BitmapFactory.Options();
		imageOptions.inSampleSize = inSampleSize;
		imageBitmap = BitmapFactory.decodeStream(inputStream, null, imageOptions);
		
		//画像を回転させる
		deg = GetImageOrientation(context, uri2);
		Matrix mat = new Matrix();
		mat.postRotate( deg );
		int sw = imageBitmap.getWidth();
		int sh = imageBitmap.getHeight();
		rotatedBitmap = Bitmap.createBitmap( imageBitmap, 0, 0, sw, sh, mat, true);
		
		//inputStream.close();
	} catch (Exception e) {
		System.out.println("e:" + e);
	}
	
	imageBitmap = null;    	
	
	return rotatedBitmap;
}

fileUri2contentUri()メソッドについてはこちら
GetImageOrientation()メソッドについてはこちら