GridViewで画像データを更新する方法

Question

My Appには、GridViewのフォルダの画像を示すフラグメントがあります。

グリッドビューのOnClickでは、ファイルパスのファイル名をインテントから別のアクティビティに渡します。

この活動は、フルサイズの画像を表示... 私は（SDカードから画像を削除するには、[削除]オプションを使用して、仕上げ）の活動を終了すると呼ばれ... 画像は削除されますが、GridViewのISN 't refresh ... まだサムネイルが表示されています！

finish（）;を呼び出すときにGridviewをリフレッシュする方法GridViewのを示し

断片 -

public class Downloaded extends Fragment{ 



    // Declare variables 
    private String[] FilePathStrings; 
    private String[] FileNameStrings; 
    private File[] listFile; 
    GridView grid; 
    GridViewAdapter adapter; 
    File file; 
    TextView empty; 

@Override 
public void onActivityCreated(Bundle 
savedInstanceState) { 
super.onActivityCreated(savedInstanceState); 
    getActivity().setTitle("Saved"); 
} 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) 
    { 
     //Inflating the Layout 
     View rootView = inflater.inflate(R.layout.gridview_main, container, false); 


     // Check for SD Card 
     if (!Environment.getExternalStorageState().equals(
       Environment.MEDIA_MOUNTED)) { 
      Toast.makeText(getActivity(), "Error! No SDCARD Found!", Toast.LENGTH_LONG) 
        .show(); 
     } else { 
      // Locate the image folder in your SD Card 
      file = new File(Environment.getExternalStorageDirectory() 
        + File.separator + "Sample"); 
      // Create a new folder if no folder named SDImageTutorial exist 
      file.mkdirs(); 
     } 

     if (file.isDirectory()) { 
      listFile = file.listFiles(); 
      // Create a String array for FilePathStrings 
      FilePathStrings = new String[listFile.length]; 
      // Create a String array for FileNameStrings 
      FileNameStrings = new String[listFile.length]; 

      for (int i = 0; i < listFile.length; i++) { 
       // Get the path of the image file 
       FilePathStrings[i] = listFile[i].getAbsolutePath(); 
       // Get the name image file 
       FileNameStrings[i] = listFile[i].getName(); 
      } 
     } 


     // Locate the GridView in gridview_main.xml 
     grid = (GridView) rootView.findViewById(R.id.gridview); 

     empty = (TextView) rootView.findViewById(R.id.empty); 

     empty.setText("You haven't saved any Pic yet...!"); 

     grid.setEmptyView(empty); 

     // Pass String arrays to LazyAdapter Class 
     adapter = new GridViewAdapter(getActivity(), FilePathStrings, FileNameStrings); 

     // Set the LazyAdapter to the GridView 
     grid.setAdapter(adapter); 



     // Capture gridview item click 
     grid.setOnItemClickListener(new OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> parent, View view, 
        int position, long id) { 

       Intent i = new Intent(getActivity(), ViewImage.class); 
       // Pass String arrays FilePathStrings 
       i.putExtra("filepath", FilePathStrings); 
       // Pass String arrays FileNameStrings 
       i.putExtra("filename", FileNameStrings); 
       // Pass click position 
       i.putExtra("position", position); 
       startActivity(i); 
      } 

     }); 
     return rootView; 
    } 
} 

&は、ここで画像を削除しViewImageクラスだ -

public class ViewImage extends AppCompatActivity { 
    // Declare Variable 
    TextView text; 
    public String[] filepath; 
    public int position; 
    public String[] filename; 

    private TouchImageView imageview; 


    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     // Get the view from view_image.xml 
     setContentView(R.layout.img_act); 

     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setDisplayShowHomeEnabled(true); 

     // Retrieve data from MainActivity on GridView item click 
     Intent i = getIntent(); 

     // Get the position 
     position = i.getExtras().getInt("position"); 

     // Get String arrays FilePathStrings 
      filepath = i.getStringArrayExtra("filepath"); 

     // Get String arrays FileNameStrings 
     filename = i.getStringArrayExtra("filename"); 

     // Locate the TextView in view_image.xml 
     //text = (TextView) //findViewById(R.id.imagetext); 

     // Load the text into the TextView followed by the position 
     getSupportActionBar().setTitle(filename[position]); 

     // Locate the ImageView in view_image.xml 
     imageview = (TouchImageView) findViewById(R.id.full_image_view); 

    // Decode the filepath with BitmapFactory followed by the position 
     Bitmap bmp = BitmapFactory.decodeFile(filepath[position]); 

     // Set the decoded bitmap into ImageView 
     imageview.setImageBitmap(bmp); 

@Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.image_view, menu); 
     return true; 
    } 


public boolean onOptionsItemSelected(MenuItem item) 
    { 
     switch (item.getItemId()){ 

      case R.id.vi; 

       File f = new File(filepath[position]); 

      if (f.exists()) 
      { 
       f.delete(); 
      } 
      this.finish(); 

      break; 

      case android.R.id.home: 
       onBackPressed(); 
       break; 
       } 

     return true; 
     } 
    } 

Answer 1

削除し、フィニッシュ活動後onActivityResultでフラグメントにadapter.notifyDataSetChanged()を呼び出す必要があります。 ViewImage活動 で

あなたのフラグメントで

grid.setOnItemClickListener(new OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> parent, View view, 
        int position, long id) { 

       Intent i = new Intent(getActivity(), ViewImage.class); 
       // Pass String arrays FilePathStrings 
       i.putExtra("filepath", FilePathStrings); 
       // Pass String arrays FileNameStrings 
       i.putExtra("filename", FileNameStrings); 
       // Pass click position 
       i.putExtra("position", position); 
       startActivityForResult (i, 101); 
      } 

     }); 

私はフィニッシュ（呼び出すとき

私の場合は

case R.id.vi; 

       File f = new File(filepath[position]); 

      if (f.exists()) 
      { 
       f.delete(); 
      } 
      Intent i = new Intent(); 
     i.putInt("POS", your_deleted_item_pos"); 
     setResult(RESULT_OK, i); 
     finish(); 

      break; 

およびフラグメントで

@Override 
     public void onActivityResult(int requestCode, int resultCode, Intent data) { 
      super.onActivityResult(requestCode, resultCode, data); 
      if (resultCode == RESULT_OK) { 
       switch (requestCode) { 
        case 101: 
         if(data.containsKey("POS"){ 
         int pos = data.getInt("POS"); 
         /*here you have to Remove item from FilePathStrings and FileNameStrings for particular position.*/ 
         adapter.notifyDataSetChanged(); // it only done when your deleted image is remove from list which you bind in gridview. 
         break; 

       } 
      } 
     }