Android programming picture operation class definition and usage example [photographing, photo selection and cropping]

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/**
  * Picture operation in Android (photographs, photo album picture selection and picture cropping)
  * Author: ldm
  * Time: 20162016/7/11 09:09
  */
public class ImageTestActivity extends Activity implements  {
  //Photograph  private Button take_photo;
  //Select pictures from the album  private Button local_pic;
  //Picture display  private ImageView upload_image;
  //Define operation constant  private final static int TAKE_PHOTO_REQUEST = 1;
  private final static int LOCAL_PICS_REQUEST = 2;
  private final static int UPLOAD_PIC_REQUEST = 3;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    (savedInstanceState);
    setContentView(.activity_image_test);
    //Initialize the control and listen to events    initViews();
  }
  private void initViews() {
    this.upload_image = (ImageView) findViewById(.upload_image);
    this.take_photo = (Button) findViewById(.take_photo);
    this.local_pic = (Button) findViewById(.local_pics);
    this.take_photo.setOnClickListener(this);
    this.local_pic.setOnClickListener(this);
  }
  @Override
  public void onClick(View view) {
    if (() == .take_photo) {//Photograph      //Calling the system to take pictures In      Intent photoIn = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
      startActivityForResult(photoIn, TAKE_PHOTO_REQUEST);
    } else if (() == .local_pics) {//Select from the album      Intent picsIn = new Intent(Intent.ACTION_GET_CONTENT);
      ("image/*");//Set the selected data type as picture type
       startActivityForResult(picsIn, LOCAL_PICS_REQUEST);
     }
   }
   //After taking a photo or selecting an album, the data will be processed here
   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     (requestCode, resultCode, data);
     if (null == data) {
       return;
     }
     switch (requestCode) {
       case TAKE_PHOTO_REQUEST:
         Bundle bundle = ();//Get picture data
         if (null != bundle) {
           Bitmap bm = ("data");
           //Show the picture on ImView
 // upload_image.setImageBitmap(bm);
           //Cut the picture
           Uri uri = (bm);
           startImageCrop(uri);
         }
         break;
       case LOCAL_PICS_REQUEST:
         Uri uri = ();//The Uri from the picture starts with the format of content://
         //Get the picture
         Bitmap bm = ImageUtils.uri2Bitmap(, uri);
         //Show the picture on ImView
 // upload_image.setImageBitmap(bm);
         //Save the photo taken to the local and convert it to file format Uri
         Uri fileUri = (bm);
         //Cut the picture
         startImageCrop(fileUri);
         break;
       case UPLOAD_PIC_REQUEST:
         //Show the cropped pictures
         Bundle b = ();
         Bitmap bitmap = ("data");
         //The picture is displayed
         upload_image.setImageBitmap(bitmap);
         break;
     }
   }
   /**
    * @param
    * @description Image Cropping
    * @author ldm
    * @time 2016/7/11 10:07
    */
  private void startImageCrop(Uri uri) {
    Intent intent = new Intent("");
    (uri, "image/*");//Set Uri and type    ("crop", "true");//
    ("aspectX", 2);//The proportion in the X direction    ("aspectY", 1);//The proportion in the Y direction    ("outputX", 200);//The X-direction width of the cropping area    ("outputY", 100);//The Y direction width of the cropping area    ("scale", true);// Whether to retain proportion    ("outputFormat", ());
    ("return-data", true);// Whether to keep the data in Bitmap to return the corresponding Bitmap data of dataParcelable    startActivityForResult(intent, UPLOAD_PIC_REQUEST);
  }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:andro
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">
  <Button
    android:
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="10dp"
    android:text="Photo upload" />
  <Button
    android:
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="10dp"
    android:text="Local Upload" />
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Picture Information Display"
    android:layout_marginLeft="10dp"
    android:textSize="16sp"/>
  <ImageView
    android:
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"/>
</LinearLayout>

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/**
  * description: The Uri obtained from the picture starts with content://, and find the corresponding picture from U.
  * Author: ldm
  * Room: 20162016/7/11 09:47
  */
public class ImageUtils {
  public static Bitmap uri2Bitmap(Context mContext, Uri uri) {
    InputStream in = null;
    try {
      in = ().openInputStream(uri);
      //Get picture from input stream      Bitmap bm = (in);
      ();
      return bm;
    } catch (Exception e) {
      ();
    }
    return null;
  }
  /**
    * @param
    * @description Save the picture to the mobile phone SD card and return the file i corresponding to the picture
    * @author ldm
    * @time 2016/7/11 9:55
    */
  public static Uri saveBitmapToSdCard(Bitmap bm) {
    //Customize the image name    String name = ("yyyyMMdd_hhmmss", ()) + ".png";
    //Define the location of the image    File tempFile = new File("/sdcard/Image/");
    if (!()) {
      ();
    }
    String fileName = "/sdcard/Image/" + name;
    File pic = new File(fileName);
    try {
      FileOutputStream os = new FileOutputStream(pic);
      //Compress the picture      (, 100, os);
      ();
      ();
      return (pic);
    } catch (Exception e) {
      ();
    }
    return null;
  }
}

<uses-permission android:name=".READ_EXTERNAL_STORAGE" />
<uses-permission android:name=".WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name=".MOUNT_UNMOUNT_FILESYSTEMS"/>