如何在gridview中单击缩略图时显示全尺寸图像

Question

In my project i want that whenever anyone clicks on thumbnail , full size image should open in an activity which user can zoom . but facing problem in passing the url of image (i used arraylist).

below is the code

import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;

import java.util.ArrayList;


public class NoticeList_Seminar extends AppCompatActivity {

GridView gridView;
ArrayList<Notice_Activity_Seminar> list;
Notice_List_Adapter_Seminar adapter_seminar = null;

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

    gridView = (GridView) findViewById(R.id.gridView);
    list = new ArrayList<>();
    adapter_seminar = new Notice_List_Adapter_Seminar(NoticeList_Seminar.this, R.layout.noticeitemslayout_seminar, list);
    gridView.setAdapter(adapter_seminar);

    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            //Intent intent = new Intent(getApplicationContext(), FullImageActivity.class);
            // passing array index
            //intent.putExtra("id",i);
            //startActivity(intent);
            Toast.makeText(getApplicationContext(),"full image", Toast.LENGTH_SHORT).show();
        }
    });

    Cursor cursor = App_Activity_Seminar.sqLiteHelper_seminar.getData("SELECT * FROM NOTICE_SEMINAR");
    list.clear();
    while (cursor.moveToNext()) {
        int id = cursor.getInt(0);
        String name = cursor.getString(1);
        String date = cursor.getString(2);
        byte[] image = cursor.getBlob(3);
        list.add(new Notice_Activity_Seminar(id, name, date, image));
    }
    adapter_seminar.notifyDataSetChanged();
}

}

code for FullImage activity

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;

import static com.example.shakshi.demo.R.id.imageView;

public class FullImageActivity extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.full_image);

    // get intent data
   Intent i = getIntent();

    // Selected image id

    int pos = i.getIntExtras("position",0);

    imageView.setImageResource(Notice_List_Adapter_Seminar.noticeList[pos]);


   /* Intent i = getIntent();

    // Selected image id
    int position = i.getExtras().getInt("id");
  Notice_List_Adapter_Seminar imageAdapter = new 
 Notice_List_Adapter_Seminar(FullImageActivity.this);

     ImageView imageView = (ImageView) findViewById(R.id.full_image_view);

imageView.setImageResource(Notice_List_Adapter_Seminar.noticeList[position]);

}

}

changes i have done

 gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {


        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int 
        i, long l) {



            String url = String.valueOf(adapterView.getItemAtPosition(i));
            Intent intent = new Intent(NoticeList_Workshop.this, 
             FullImageActivity.class);
            intent.putExtra("url", url);
            startActivity(intent);

        }
    });

in Full Image Activity

String url = getIntent().getExtras().getString("url");


   ImageView imageView = (ImageView) findViewById(R.id.full_image_view);
   imageView.setImageResource(Integer.parseInt(url));    

Answer 1

Use gridViewOnClickListener and Intent .

GridView grdview = (GridView) findViewById(R.id.gridview);

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

                String url = list.get(position);
                Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
                intent.putExtra("url", url);
                startActivity(intent)
            }
        });

In SecondActivity onCreate() method,

String url = getIntent().getExtras().getString("url");

Set the Source of Imageview = url;

Answer 2

If you are using Gridview. You get onItemClickListener which also gives you the position of the item which got clicked. So in your onItemClickListener you can get the image url from the arraylist at that position and pass it to your next activity.

And if you are using Recyclerview then you can use callback pattern and using that you can send the same url as a String on which the user has clicked to the containing activity. You can then pass this url to the next activity.