从图库中选择图像并将其保存在Android App中

Question

I am selecting an image from gallery and when we are clearing from recent apps the image which we selected also getting deleted.I want to display the image even though it is removed from recent apps which means I want to save the image in app.please provide me the total code.

Thanks in Advance.

Answer 1

package com.developerscode.com.profile_activity;

import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Created by android on 6/5/16.
 */
public class MainActivity extends AppCompatActivity {

    private int PICK_IMAGE_REQUEST = 1;
    ImageView image;


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

        image = (ImageView) findViewById(R.id.image);

        SharedPreferences myPrefrence = getPreferences(MODE_PRIVATE);
        String imageS = myPrefrence.getString("imagePreferance", "");
        Bitmap imageB;
        if(!imageS.equals("")) {
            imageB = decodeToBase64(imageS);
            image.setImageBitmap(imageB);
        }
    }


    public void selectImage(View v){
        Intent intent = new Intent();
// Show only images, no videos or anything else
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
// Always show the chooser (if there are multiple options available)
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(intent, PICK_IMAGE_REQUEST);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {

            InputStream stream;
            try {
                Toast.makeText(MainActivity.this, "Image saved", Toast.LENGTH_SHORT).show();
                stream = getContentResolver().openInputStream(data.getData());
                Bitmap realImage = BitmapFactory.decodeStream(stream);
               image.setImageBitmap(realImage);


                SharedPreferences myPrefrence = getPreferences(MODE_PRIVATE);
                SharedPreferences.Editor editor = myPrefrence.edit();
                editor.putString("imagePreferance", encodeToBase64(realImage));

                editor.commit();
            }
            catch (FileNotFoundException e) {
               // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

  public static String encodeToBase64(Bitmap image) {
      Bitmap immage = image;
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      immage.compress(Bitmap.CompressFormat.PNG, 100, baos);
      byte[] b = baos.toByteArray();
      String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);

      Log.d("Image Log:", imageEncoded);
      return imageEncoded;
  }

    public static Bitmap decodeToBase64(String input) {
        byte[] decodedByte = Base64.decode(input, 0);
        return BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
    }

}

Answer 2

If you want your selected images to be stored even after destroying app, Why not just use SharedPreferences. Simply put your file path in Shared preferences.

Code:

     public class save  
  {

           SharedPreferences sharedPreferences;

           Context ctx;
           public save(Context ctx,String file)
                      {
                      this.ctx =ctx;
                      sharedPreferences = this.ctx.getSharedPreferences(file,Context.MODE_PRIVATE);

                      }



public void store(String key,String value)
{
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putString(key,value);
    editor.commit();

}

public String read(String key)
{

   String v= sharedPreferences.getString(key, "nothing");
    return v;

}

public void remove()
{
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.clear();
    editor.commit();
}
public void delete(String str){

    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.remove(str);
    editor.commit();

}

public Map<String, ?> readall(){

    Map<String, ?> allEntries = sharedPreferences.getAll();

    return allEntries;
}}

To add selected path to shared preferences use method store();

to delete a path from shared preferences use method delete();

to remove all use method remove();

to read all use readall();