Android UI: ImageView for screen adaptation and image Cropping

ImageView allows you to adjust images to the screen size and crop images. main Interface: Adapt to the screen: Crop an image: display the cropped image to ImagView: source code: MainActivity. java [html] www.2cto. compackage com. imageview. activity; import java. io. fileNotFoundException; 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. util. log; import android. View. view; import android. view. view. onClickListener; import android. widget. button; import android. widget. imageView; import android. widget. toast; public class MainActivity extends Activity implements OnClickListener {private Button imageSelectBtn; private Button imageCutBtn; private ImageView imageView; // declare two static integer variables, private static final int IMAGE_SELECT = 1; // select the image private static final Int IMAGE_CUT = 2; // crop the image @ Override public void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); setupViews () ;}// my consistent style Haha public void setupViews () {imageSelectBtn = (Button) findViewById (R. id. imageSelectButton); imageSelectBtn. setOnClickListener (this); imageCutBtn = (Button) findViewById (R. id. imageCutButton); imageCutBtn. setOnClickListe Ner (this); imageView = (ImageView) findViewById (R. id. imageView) ;}@ Override protected void onActivityResult (int requestCode, int resultCode, Intent data) {super. onActivityResult (requestCode, resultCode, data); if (resultCode = RESULT_ OK) {// display the processed image according to the phone screen size if (requestCode = IMAGE_SELECT) {// obtain the image URL Uri = data. getData (); // get the screen width int dw = getWindowManager (). getdefadisplay display (). getWidth (); // Get the screen width int dh = getWindowManager (). getdefadisplay display (). getHeight ()/2; try {// class for cropping images, which is an anonymous internal class BitmapFactory. options factory = new BitmapFactory. options (); // if this parameter is set to true, the memory factory is not allocated by pixels. inJustDecodeBounds = true; Bitmap bmp = BitmapFactory. decodeStream (getContentResolver (). openInputStream (uri), null, factory); // match the height and width of the image on the mobile phone screen. // The ratio of width to int wRatio = (int) Math. ceil (factory. OutWidth/(float) dw); // The ratio of height to int hRatio = (int) Math. ceil (factory. outHeight/(float) dh); // if wRatio is greater than 1, the image width is greater than the screen width, similar to hRatio if (wRatio> 1 | hRatio> 1) {// inSampleSize> 1, if (hRatio> wRatio) {factory. inSampleSize = hRatio;} else {factory. inSampleSize = wRatio; }}// if this attribute is set to false, the caller is allowed to query images without allocating the factory memory for pixels. inJustDecodeBounds = false; // use the BitmapFactory object image again for screen adaptation. bmp = Bitm ApFactory. decodeStream (getContentResolver (). openInputStream (uri), null, factory); imageView. setImageBitmap (bmp);} catch (FileNotFoundException e) {e. printStackTrace () ;}} else if (requestCode = IMAGE_CUT) {// crop the image // it must be consistent with the label "data" returned by "return-data" Bitmap bmp = data. getParcelableExtra ("data"); imageView. setImageBitmap (bmp) ;}}@ Override public void onClick (View v) {switch (v. getId () {ca Se R. id. imageSelectButton: // how to extract the image from the mobile phone and select Intent intent = new Intent (Intent. ACTION_PICK, android. provider. mediaStore. images. media. EXTERNAL_CONTENT_URI); startActivityForResult (intent, IMAGE_SELECT); break; case R. id. imageCutButton: Intent intent2 = getImageClipIntent (); startActivityForResult (intent2, IMAGE_CUT); break; default: break ;}// method for obtaining the Intent of cropping an image private Intent getImageClipIntent () {Intent intent = new Intent (Intent. ACTION_GET_CONTENT, null); // to crop an image, you must set the image attributes and size intent. setType ("image/*"); // sets attributes to obtain intent images of any type. putExtra ("crop", "true"); // you can slide the property of the selected region. Note that the "true" intent string is used here. putExtra ("aspectX", 1); // you can specify a ratio of to intent. putExtra ("aspectY", 1); intent. putExtra ("outputX", 80); intent. putExtra ("outputY", 80); intent. putExtra ("return-data", true); return intent ;}} Layout file main. xml [html] <? Xml version = "1.0" encoding = "UTF-8"?> <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: layout_width = "fill_parent" android: layout_height = "fill_parent" android: orientation = "vertical"> <Button android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: text = "select image" android: id = "@ + id/imageSelectButton"/> <Button android: layout_width = "fill_parent" android: layout_height = "wrap_content" andro Id: text = "select image cropping" android: id = "@ + id/imageCutButton"/> <! -- Used to display the cropped image --> <ImageView android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: id = "@ + id/imageView"/> </LinearLayout>