[英]Selecting an Image from gallery and to save it in Android App
我正在从图库中选择一个图像,当我们从最近的应用程序中清除选择的图像时,该图像也会被删除。即使它已从最近的应用程序中删除,我仍要显示该图像,这意味着我要将图像保存在app.please向我提供总代码。
提前致谢。
包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);
}
}
如果您要在销毁应用程序后仍存储所选图像,为什么不使用SharedPreferences。 只需将您的文件路径放在“共享”首选项中。
码:
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;
}}
要将选择的路径添加到共享首选项,请使用方法store();。
要从共享首选项中删除路径,请使用delete()方法;
删除所有使用方法remove();
阅读所有使用readall();
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