Delete gridview item from gallery photos

Question

I’m developing an app that contains a gallery and found a tutorial that showed how to fill Gridview with photos taken from the camera.

However, I’m having difficulty doing something for when the user wants to delete some of the images taken have this function Thanks from now

Follows my code:

    public class GaleriaSp extends Activity implements OnClickListener{

    Button captureBtn = null;
    final int CAMERA_CAPTURE = 1;
    private Uri picUri;
    private DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private GridView grid;
    private  List<String> listOfImagesPath;

    public static final String GridViewDemo_ImagePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/GridViewDemo/";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_galeria_sp);

        captureBtn = (Button)findViewById(R.id.capture_btn1);
        captureBtn.setOnClickListener(this);
        grid = ( GridView) findViewById(R.id.gridviewimg);

        listOfImagesPath = null;
        listOfImagesPath = RetriveCapturedImagePath();
        if(listOfImagesPath!=null){
            grid.setAdapter(new ImageListAdapter(this,listOfImagesPath));
       }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_galeria_sp, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View arg1) {
        if (arg1.getId() == R.id.capture_btn1) {

            try {
    //use standard intent to capture an image
                Intent captureIntent = new         Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    //we will handle the returned data in onActivityResult
                startActivityForResult(captureIntent, CAMERA_CAPTURE);
            } catch(ActivityNotFoundException anfe){
//display an error message
                String errorMessage = "Whoops - your device doesn't support capturing images!";
                Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
                toast.show();
            }
        }
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
   //user is returning from capturing an image using the camera
            if(requestCode == CAMERA_CAPTURE){
                Bundle extras = data.getExtras();
                Bitmap thePic = extras.getParcelable("data");
                String imgcurTime = dateFormat.format(new Date());
                File imageDirectory = new File(GridViewDemo_ImagePath);
                imageDirectory.mkdirs();
                String _path = GridViewDemo_ImagePath + imgcurTime+".jpg";
                try {
                    FileOutputStream out = new FileOutputStream(_path);
                    thePic.compress(Bitmap.CompressFormat.JPEG, 90, out);
                    out.close();
                } catch (FileNotFoundException e) {
                    e.getMessage();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                listOfImagesPath = null;
                listOfImagesPath = RetriveCapturedImagePath();
                if(listOfImagesPath!=null){
                    grid.setAdapter(new ImageListAdapter(this,listOfImagesPath));
                }
            }
        }
    }

    private List<String> RetriveCapturedImagePath() {
        List<String> tFileList = new ArrayList<String>();
        File f = new File(GridViewDemo_ImagePath);
        if (f.exists()) {
            File[] files=f.listFiles();
            Arrays.sort(files);

            for(int i=0; i<files.length; i++){
                File file = files[i];
                if(file.isDirectory())
                    continue;
                tFileList.add(file.getPath());
            }
        }
        return tFileList;
    }

    public class ImageListAdapter extends BaseAdapter
    {
        private Context context;
        private List<String> imgPic;
        public ImageListAdapter(Context c, List<String> thePic)
        {
            context = c;
            imgPic = thePic;
        }
        public int getCount() {
            if(imgPic != null)
                return imgPic.size();
            else
                return 0;
        }

        //---returns the ID of an item---
        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        //---returns an ImageView view---
        public View getView(int position, View convertView, ViewGroup parent)
        {
            ImageView imageView;
            BitmapFactory.Options bfOptions=new BitmapFactory.Options();
            bfOptions.inDither=false;                     //Disable Dithering mode
            bfOptions.inPurgeable=true;                   //Tell to gc that whether it needs free memory, the Bitmap can be cleared
            bfOptions.inInputShareable=true;              //Which kind of reference will be used to recover the Bitmap data after being clear, when it will be used in the future
            bfOptions.inTempStorage=new byte[32 * 1024];
            if (convertView == null) {
                imageView = new ImageView(context);
                imageView.setLayoutParams(new GridView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
                imageView.setPadding(0, 0, 0, 0);
            } else {
                imageView = (ImageView) convertView;
            }
            FileInputStream fs = null;
            Bitmap bm;
            try {
                fs = new FileInputStream(new File(imgPic.get(position).toString()));

                if(fs!=null) {
                    bm=BitmapFactory.decodeFileDescriptor(fs.getFD(), null, bfOptions);
                    imageView.setImageBitmap(bm);
                    imageView.setId(position);
                    imageView.setLayoutParams(new GridView.LayoutParams(150, 150));
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally{
                if(fs!=null) {
                    try {
                        fs.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return imageView;
        }
    }
}

Here xml file

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
      android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="sptour.hotmail.com.Suporte"
    android:background="#fff">


    <GridView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/pp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:horizontalSpacing="2dp"
        android:numColumns="2"
        android:stretchMode="columnWidth"
        android:verticalSpacing="1dp"
        android:clickable="true"
        android:focusable="true"
        android:paddingTop="4dp" />



    <android.support.design.widget.FloatingActionButton
        android:id="@+id/ppp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:src="@drawable/ic_add_photo"
        android:layout_alignBottom="@+id/pp"
        android:layout_alignRight="@+id/pp"
        android:layout_alignEnd="@+id/pp"
        android:layout_marginRight="50dp"
        android:layout_marginEnd="50dp"
        android:layout_marginBottom="44dp" />
</RelativeLayout>

Answer 1

There are several ways to solve this problem. I will specify one of these ways. First you can use the method setOnItemClickListener which refers to the long click on an item in the grid. Soon after the ideal would be to use a AlertDialog to confirm whether or not the user wants to delete the selected item. The code would look like this:

gridView.setOnItemClickListener(new OnItemClickListener() { 
@Override 
public void onItemClick(AdapterView<?> parent, View v, int position, long id) { 
// DO something 

 listOfImagesPath.remove(position);
 } 
});

But this case you would be removing only the image from your list but not from the device. To remove from the device, you have to rescue the uri from your photo, which would be the location address where it was recorded, and delete from there as well. See the code below:

File file = new File(enderecoFoto);
file.delete(); 

Use your imagination. Good luck!