- Part 4

How To Load Text File From Assets Folder In Android

June 17, 2012 by blogmeister·0 Comments

When you place files in the assets folder and you want to use them in your Android app, you normally access them via streams.

Let us say you want to load a text file. How can one go about it?

This method will convert your assets text file into a String object.

public static String convertStreamToString(InputStream is) throws IOException {
    String text = null;
    try {
        int size = is.available();
    	byte[] buffer = new byte[size];
    	is.read(buffer);
    	is.close();
    	text = new String(buffer);
    } catch (Exception e) { }
    return text;
}

public static String convertStreamToString(InputStream is) throws IOException {

String text = null;

try {

int size = is.available();

byte[] buffer = new byte[size];

is.read(buffer);

is.close();

text = new String(buffer);

} catch (Exception e) { }

return text;

}

To use this method in your Activity, you do this.

String str = convertStreamToString(getAssets().open("sample.txt"));

1	String str = convertStreamToString(getAssets().open("sample.txt"));

Convert Bitmap To Gray Scale In Android

June 15, 2012 by blogmeister·0 Comments

The best code in Android that worked for me in converting a colored Bitmap to gray scale is this one.

public static Bitmap convertToGrayScale(Bitmap src){
    ColorMatrix bwMatrix = new ColorMatrix();
    bwMatrix.setSaturation(0);
    final ColorMatrixColorFilter colorFilter = new ColorMatrixColorFilter(bwMatrix);
    Bitmap rBitmap = src.copy(Bitmap.Config.ARGB_8888, true);
    Paint paint = new Paint();
    paint.setColorFilter(colorFilter);
    Canvas myCanvas = new Canvas(rBitmap);
    myCanvas.drawBitmap(rBitmap, 0, 0, paint);
    src.recycle();
    src = null;
    return rBitmap;
}

public static Bitmap convertToGrayScale(Bitmap src){

ColorMatrix bwMatrix = new ColorMatrix();

bwMatrix.setSaturation(0);

final ColorMatrixColorFilter colorFilter = new ColorMatrixColorFilter(bwMatrix);

Bitmap rBitmap = src.copy(Bitmap.Config.ARGB_8888, true);

Paint paint = new Paint();

paint.setColorFilter(colorFilter);

Canvas myCanvas = new Canvas(rBitmap);

myCanvas.drawBitmap(rBitmap, 0, 0, paint);

src.recycle();

src = null;

return rBitmap;

}

Notice that before the object is returned, I added two lines of code src.recycle() and src = null? This is to ensure that the non-used Bitmap object will be recycled to help avoid OutOfMemory exception errors.

Now, this is a necessity because unless you restrict your app to only run in smart phones with large RAM, you have to take this into account in order for your app to run seamlessly on smart phones that do not have have large amounts of RAM.

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June 15, 2012 by blogmeister·0 Comments

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Tech Tips & Tricks

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Month: June 2012

How To Load Text File From Assets Folder In Android

Convert Bitmap To Gray Scale In Android

PCI Compliant Hosting