Android converts an image into a black/white image

Android converts an image into a black/white image

First, call the android system tool to obtain the image to generate a bitmap file, and then use the binarization Technology in android to convert the image into a black-and-white image. The main interface code is as follows:

Package com. example. blackwhite; import java. io. IOException; import android. media. thumbnailUtils; import android.net. uri; import android. OS. bundle; import android. provider. mediaStore; import android. app. activity; import android. content. contentResolver; import android. content. intent; import android. database. cursor; import android. graphics. bitmap; import android. graphics. bitmap. config; import android. util. log; imp Ort android. view. menu; import android. view. view; import android. view. view. onClickListener; import android. widget. button; import android. widget. imageView; import android. widget. textView; public class MainActivity extends Activity {private final String IMAGE_TYPE = "image/*"; private final int IMAGE_CODE = 0; // here, IMAGE_CODE is the custom private Button addPic = null; private ImageView imgShow = null; private Text View imgPath = null; @ Overridepublic void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); init ();} private void init () {// TODO Auto-generated method stubaddPic = (Button) findViewById (R. id. btn_add); imgPath = (TextView) findViewById (R. id. img_path); imgShow = (ImageView) findViewById (R. id. imgShow); addPic. setOnClickListener (listener);} priva Te OnClickListener listener = new OnClickListener () {@ Overridepublic void onClick (View v) {// TODO Auto-generated method stubButton btn = (Button) v; switch (btn. getId () {case R. id. btn_add: setImage (); break;} private void setImage () {// TODO Auto-generated method stub // use intent to call the album function provided by the system, startActivityForResult is used to obtain the address Intent getAlbum = new Intent (Intent. ACTION_GET_CONTENT); getAlbum. setTyp E (IMAGE_TYPE); startActivityForResult (getAlbum, IMAGE_CODE) ;}}; protected void onActivityResult (int requestCode, int resultCode, Intent data) {// RESULT_ OK is the if (resultCode! = RESULT_ OK) {Log. e ("onActivityResult", "returned resultCode error"); return;} Bitmap bm = null; // external programs can access the data provided by ContentProvider through the ContentResolver interface ContentResolver resolver = getContentResolver (); // determine whether the received Activity selects the image if (requestCode = IMAGE_CODE) {try {// obtain the image URL UriUri originalUri = data. getData (); // generate bitmapbm = MediaStore Based on the image URi. images. media. getBitmap (resolver, originalUri); // convert an image into a black/white image bm = convertToBla CkWhite (bm); // displays the bitmap image imgShow. setImageBitmap (bm); // creates a new string array to store the image address data. String [] proj = {MediaStore. images. media. DATA}; // interface provided by the android system, used to obtain DATA Cursor cursor = managedQuery (originalUri, proj, null) based on the uri ); // obtain the index value int column_index = cursor of the selected image. getColumnIndexOrThrow (MediaStore. images. media. DATA); // move the cursor to the beginning to prevent queue overflow cursor. moveToFirst (); // obtain the image path String path = cursor Based on the index value. getString (column_index); imgPath. setText (path);} catch (IOException e) {Log. e ("getImg", e. toString ());}}} /*** convert a color image to a pure black/white two color ** @ param Bitmap * @ return returns the converted Bitmap */public static Bitmap convertToBlackWhite (Bitmap bmp) {int width = bmp. getWidth (); // get the width of the bitmap int height = bmp. getHeight (); // obtain the bitmap's high int [] pixels = new int [width * height]; // create the pixel array bmp by the bitmap size. getPixels (pixels, 0, width, 0, 0, width, height); int alpha = 0xFF <24; for (int I = 0; I 

Sample Code address: http://download.csdn.net/detail/stop_pig/8211315