In Android, you can simply select and crop images,

In Android, you can simply select and crop images,

Selecting images in android is a common function. The image source is usually obtained from the camera or from the album.
First, write a simple selection button and an ImageView that displays the image.

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: layout_width = "match_parent" android: layout_height = "match_parent" android: orientation = "vertical"> <Button android: id = "@ + id/bt_picture" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: text = "get image"/> <ImageView android: id = "@ + id/picture" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: layout_gravity = "center_horizontal"/> </LinearLayout>

The following is the implementation logic.

Private String [] takePhotoitems; // public static final int TAKE_PHOTO = 1; public static final int CROP_PHOTO = 2; private Button getPicture; private ImageView picture; private Uri imageUri;

Set button click events

@ Override public void onClick (View v) {takePhotoitems = new String [] {"select local image", "photo"}; imageUri = getImageUri (); new AlertDialog. builder (this ). setTitle ("set Avatar "). setItems (takePhotoitems, new DialogInterface. onClickListener () {@ Override public void onClick (DialogInterface dialog, int which) {switch (which) {case 0: getImageUri (); Intent intent = new Intent (Intent. ACTION_GET_CONTENT); intent. setDataAndType (MediaStore. images. media. EXTERNAL_CONTENT_URI, "image/*"); intent. setType ("image/*"); intent. putExtra ("crop", "true"); intent. putExtra ("scale", true); intent. putExtra (MediaStore. EXTRA_OUTPUT, imageUri); startActivityForResult (intent, CROP_PHOTO); break; case 1: // photograph getImageUri (); if (isHasSdcard () {Intent takePhotoIntent = new Intent ("android. media. action. IMAGE_CAPTURE "); takePhotoIntent. putExtra (MediaStore. EXTRA_OUTPUT, imageUri); startActivityForResult (takePhotoIntent, TAKE_PHOTO);} else {Toast. makeText (MainActivity. this, "SD card not detected", Toast. LENGTH_LONG ). show () ;}break ;}}}). setNegativeButton ("cancel", new DialogInterface. onClickListener () {@ Override public void onClick (DialogInterface dialog, int which) {dialog. dismiss ();}}). show ();}

Two tools and methods used

/*** Obtain the image path */private Uri getImageUri () {File outputImage = new File (Environment. getExternalStorageDirectory (), "tempImage.jpg"); if (outputImage. exists () {outputImage. delete ();} try {outputImage. createNewFile ();} catch (IOException e) {e. printStackTrace ();} return Uri. fromFile (outputImage );};

/*** Determine whether the SD card exists */public static boolean isHasSdcard () {String state = Environment. getExternalStorageState (); if (state. equals (Environment. MEDIA_MOUNTED) {return true;} else {return false ;}}

Crop an image after it is obtained

    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        switch (requestCode) {        case TAKE_PHOTO:            if (resultCode == RESULT_OK) {                Intent intent = new Intent("com.android.camera.action.CROP");                intent.setDataAndType(imageUri, "image/*");                intent.putExtra("scale", true);                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);                startActivityForResult(intent, CROP_PHOTO);            }            break;        case CROP_PHOTO:            if (resultCode == RESULT_OK) {                try {                    Bitmap bitmap = BitmapFactory                            .decodeStream(getContentResolver().openInputStream(                                    imageUri));                    picture.setImageBitmap(bitmap);                } catch (FileNotFoundException e) {                    e.printStackTrace();                }            }            break;        default:            break;        }    }