重新加載應用后無法從uri加載圖像

Question

*//Sorry for bad eng, but in stackoverflow.ru I have no answers you my last chance*

我的應用程序有1個活動，這應該從galery影像\\照片，保存uri的這個圖片\\照片sharedPreferences ，並重裝后，應用程序加載圖像從保存的uri中的ImageView

因此，重新加載uri成功保存並加載到應用程序后，但應用程序無法加載來自uri照片，而是圖像我有空的空間，但ImageView存在並且加載了uri一切正常（我比較加載的uri和uri來自galery，他們等於）。

下面我附上我的代碼和截圖：

XML：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="ua.bellkross.testapp.MainActivity">


    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        app:srcCompat="@drawable/myphoto2" />
</LinearLayout>

Java的：

package ua.bellkross.testapp;

import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    ImageView imageView;
    SharedPreferences sharedPreferences;
    String photoUri;
    boolean can;

    final int GALLERY_REQUEST = 1;

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView = (ImageView) findViewById(R.id.imageView);
        loadPhoto();
        imageView.setOnClickListener(this);
    }

    @Override
    protected void onStop() {
        super.onStop();
        savePhoto();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.imageView :
                Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
                photoPickerIntent.setType("image/*");
                startActivityForResult(photoPickerIntent, GALLERY_REQUEST);
                break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Uri selectedImage = data.getData();
        imageView.setImageURI(selectedImage);
        photoUri = selectedImage.toString();
        Log.d("myLog", "savedURI == " + photoUri);
        can = true;
    }

    private void savePhoto(){
        sharedPreferences = getPreferences(MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString("uri",photoUri);
        editor.putBoolean("edited",can);
        editor.commit();
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    private void loadPhoto(){
        sharedPreferences = getPreferences(MODE_PRIVATE);
        if(sharedPreferences.getBoolean("edited",false)) {
            String savedURI = sharedPreferences.getString("uri", null);
            if (!savedURI.equals(null)) {
                Log.d("myLog", "savedURI!=null");
                imageView.setImageURI(Uri.parse(savedURI));
                Log.d("myLog", "savedURI == " + savedURI);
            }
        }
        can = false;
    }
}

---

//I have no reputation to post images and more than 2 links
    https://i.stack.imgur.com/hveS0.jpg - start app
    https://i.stack.imgur.com/UrzHF.jpg - take image from galery
    https://i.stack.imgur.com/Cwy37.jpg - after reload app

---

我做了修復它嗎？

1）用uri檢查已保存和加載的uri - 它們等於，我用日志做了這個

05-09 22:05:24.893 524-524/ua.bellkross.testapp D/myLog: savedURI(OnActivityResult) == content://media/external/images/media/16493
05-09 22:05:29.505 1294-1294/? D/myLog: savedURI!=null
05-09 22:05:29.510 1294-1294/? D/myLog: savedURI == content://media/external/images/media/16493

2）嘗試使用getSharedPreferences而不是sharedPreferences - 它沒有幫助

3）嘗試使用imageView.setImageURI(null) ， imageView.invalidate() ， imageView.postInvalidate() ，在加載圖像之前 - 沒有幫助。

4）從@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)檢查我的Android和版本的版本@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) - 它們等於，一切正常

5）嘗試從content://media/external/images/media/16493更改uri content://media/external/images/media/16493到media/external/images/media/16493 - 沒有幫助

6）嘗試使用onRestoreInstanceState和onSaveInstanceState - 它沒有幫助， onRestoreInstanceState僅在您更改屏幕方向時啟動，而不是在重新加載后啟動。

也許，如果你自己運行或只是寫類似的應用程序（它需要5-10分鍾），這個應用程序將工作 - 比較變得清晰，我有哪個錯誤。

---

伙計們，我找到答案，謝謝你 - greenapps

我嘗試打開流InputStream is = getContentResolver().openInputStream(uri); 並獲得堆棧跟蹤並找到一些字符串

05-10 16:13:40.081 1264-1286/? E/DatabaseUtils: Writing exception to parcel
                                                java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/images/media/18553 from pid=8465, uid=10268 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()

所以，只需在AndroidManifest中編寫

  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>

Answer 1

嘗試首先將imageView設置為null，然后像這樣正常設置：

imageView.setImageURI(null);
imageView.setImageURI(Uri.parse(savedURI));

Answer 2

我嘗試打開流InputStream is = getContentResolver().openInputStream(uri); 並獲得堆棧跟蹤並找到一些字符串

05-10 16:13:40.081 1264-1286/? E/DatabaseUtils: Writing exception to parcel
                                                java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/images/media/18553 from pid=8465, uid=10268 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()

所以，只需在AndroidManifest中編寫

  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>