Question

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

我有1个活动的应用，应该从galery获取图片\照片，保存uri中此图片\照片的sharedPreferences，并在重新加载后，应用加载来自已保存{{1}的图片在imageView中

因此，重新加载uri成功保存并加载到应用中后，但应用无法从uri加载照片，而是图片我有空格，但uri存在且加载ImageView一切正常（我比较加载的uri和uri来自galery，它们等于）。

下面我附上我的代码和截图：

XML：

uri

的java：

<?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>

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;
    }
}

我做了修复它吗？

1）检查保存并加载//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与uri来自galery - 它们等于，我用日志做了

uri

2）尝试使用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代替getSharedPreferences - 它没有帮助

3）在加载图片之前，请尝试使用sharedPreferences，imageView.setImageURI(null)，imageView.invalidate() - 不要帮忙。

4）从imageView.postInvalidate()检查我的Android版本和版本 - 等于，一切正常

5）尝试将@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)从uri更改为content://media/external/images/media/16493 - 没有帮助

6）尝试使用media/external/images/media/16493和onRestoreInstanceState - 它不会帮助，onSaveInstanceState只有在您更改屏幕方向时启动，但在重新加载后才会启动。

也许，如果你自己运行它或只是写类似的应用程序（需要5-10分钟），这个应用程序将起作用 - 比较变得清晰，我有哪个错误。

伙计们，我找到答案，谢谢你 - greenapps

我尝试开放流onRestoreInstanceState 并获得堆栈跟踪并找到一些字符串

InputStream is = getContentResolver().openInputStream(uri);

所以，只需在AndroidManifest中写一下

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()

Answer 1

首先尝试将imageView设置为null，然后像这样正常设置：

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

Answer 2

我尝试开放流InputStream is = getContentResolver().openInputStream(uri); 并获得堆栈跟踪并找到一些字符串

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中写一下

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

重新加载应用

2 个答案: