android - READ_EXTERNAL_STORAGE 权限在 list 中，但仍然不起作用

Question

在 androidmanifest.xml 我有:

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
<uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="23" />

在 build.gradle 我有:

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.1"

    defaultConfig {
        multiDexEnabled true
        applicationId "test"
        minSdkVersion 16
        targetSdkVersion 23

如果我尝试调用 CameraRoll.getPhotos()获取图书馆照片我得到错误:

Could not get photos: need READ_EXTERNAL_STORAGE permission
    at createErrorFromErrorData

我正在尝试在具有 android 6 和 7 的真实设备上运行应用程序，并且我试图使其像在 IOS 中一样工作 - 当调用 getPhotos() 以查看权限请求对话框时。
这里有什么问题？

Answer 1

要请求任何权限，您可以使用以下代码并添加您需要的权限。这是您通过在访问与权限相关的任何数据之前请求它们来处理运行时权限的方式

public  boolean isStoragePermissionGranted() {
if (Build.VERSION.SDK_INT >= 23) {

    if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
            == PackageManager.PERMISSION_GRANTED) {
        Log.v(TAG,"Permission is granted");
        return true;
    } else {

        Log.v(TAG,"Permission is revoked");
        ActivityCompat.requestPermissions(this, new String[]{ Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
        return false;
    }
}
else { //permission is automatically granted on sdk<23 upon installation
    Log.v(TAG,"Permission is granted");
    return true;
}
}

一旦你这样做了，对于 API >=23 的设备，你将在运行时弹出，然后一旦用户接受或拒绝它，你的 onRequestPermissionsResult方法被调用。所以在这里你必须处理你的检查用户是否授予应用程序权限。如果是，你可以继续你的逻辑

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case 0:
            boolean isPerpermissionForAllGranted = false;
            if (grantResults.length > 0 && permissions.length==grantResults.length) {
                for (int i = 0; i < permissions.length; i++){
                    if (grantResults[i] == PackageManager.PERMISSION_GRANTED){
                        isPerpermissionForAllGranted=true;
                    }else{
                        isPerpermissionForAllGranted=false;
                    }
                }

                Log.e("value", "Permission Granted");
            } else {
                isPerpermissionForAllGranted=true;
                Log.e("value", "Permission Denied");
            }
            if(isPerpermissionForAllGranted){
               // do your stuff here
            }
            break;
    }
}

更新 1 用于 react Native

String[] perms = {
    "android.permission.READ_EXTERNAL_STORAGE", 
    "android.permission.WRITE_EXTERNAL_STORAGE"
};



@Override
public void onCreate (Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Checking permissions on init
    checkPerms();
}


public void checkPerms() {
    // Checking if device version > 22 and we need to use new permission model 
    if(Build.VERSION.SDK_INT>Build.VERSION_CODES.LOLLIPOP_MR1) {
        // Checking if we can draw window overlay
        if (!Settings.canDrawOverlays(this)) {
            // Requesting permission for window overlay(needed for all react-native apps)
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
              Uri.parse("package:" + getPackageName()));
            startActivityForResult(intent, OVERLAY_PERMISSION_REQ_CODE);
        }
        for(String perm : perms){
            // Checking each persmission and if denied then requesting permissions
            if(checkSelfPermission(perm) == PackageManager.PERMISSION_DENIED){
                requestPermissions(perms, PERMISSION_REQ_CODE);
                break;
            }
        }
    }
}

// Window overlay permission intent result
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if (requestCode == OVERLAY_PERMISSION_REQ_CODE) {
      checkPerms();
  }
}

// Permission results
@Override
public void onRequestPermissionsResult(int permsRequestCode, String[] permissions, int[] grantResults){
    switch(permsRequestCode){
        case PERMISSION_REQ_CODE:
            // example how to get result of permissions requests (there can be more then one permission dialog)
            // boolean readAccepted = grantResults[0]==PackageManager.PERMISSION_GRANTED;
            // boolean writeAccepted = grantResults[1]==PackageManager.PERMISSION_GRANTED;
            // checking permissions to prevent situation when user denied some permission
            checkPerms();
            break;

    }
}