Question

下面的代码用于尝试文件提供程序以准备android Nougat：

清单文件：

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_files" path="/"/>
</paths>

file provider xml：

private Uri createImageFile() throws Exception {
         File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), System.currentTimeMillis() + ".jpg");
         //File file = new File(System.currentTimeMillis() + ".jpg");

         Uri photoUri = null;

         try{
             photoUri = FileProvider.getUriForFile(this, "com.securefilesharing.fileprovider", file);
         }
         catch(Exception e){
             Toast.makeText(this, e.toString(), Toast.LENGTH_SHORT).show();
         }

         return photoUri;
     }

View.OnClickListener ocl = new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            try {
                uri = createImageFile();
                cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
                cameraIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
            } catch (Exception e) {
                Log.e(TAG, TAG + ": " + e.toString());
            }           
            startActivityForResult(cameraIntent, CAMERA_REQUEST); 
        }
    };

构建URI并传递给相机意图：

angular.module('myApp', []).controller('myCtrl', ['$scope', function($scope){
  $scope.myData = [
	{ 
	  'car': 'Ford',
	  'color': [{'primary':'Black'},{'secondary':'White'}],
	  'number': '1, 2, 3',
	  'model': 'Figo'			  
	}, { 
	  'car': 'Ford',
	  'color': [{'primary':'Red'},{'secondary':'Black'}],
	  'number': '4,5',
	  'model': 'Endeavour'			  
	},{ 
	  'car': 'Jaguar',
	  'color': [{'primary':'White'},{'secondary':'Red'}],
	  'number': '6',
	  'model': 'F-Type'			  
	},
  ];
  
  $scope.getData = function(obj){
   $scope.color =[]; 
        $scope.color.push(obj[0].primary);
        $scope.color.push(obj[1].secondary);
	console.log($scope.color);
  };
}]);

我还做了activity.requestPermissions（forPermissions.toArray（new String [0]），PERMISSION_CODE）;对于相机，读写外部文件

下面的

是异常消息：

06-22 15：04：13.962：E / HomeSecureFileShareTestActivity（31851）：HomeSecureFileShareTestActivity：java.lang.NullPointerException：尝试调用虚方法＆＃39; android.content.res.XmlResourceParser android.content.pm.ProviderInfo .loadXmlMetaData（android.content.pm.PackageManager，java.lang.String）＆＃39;在空对象引用上

Answer 1

<provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="com.securefilesharing.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true" >
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_provider_path" />
        </provider>

更改清单中的提供商部分... 参考:: https://developer.android.com/guide/topics/manifest/provider-element.html#enabled

Answer 2

试试这个，

private Context mContext=YourActivity.this;

private static final int REQUEST = 112;


View.OnClickListener ocl = new View.OnClickListener() {

    @Override
    public void onClick(View v) {

        if (Build.VERSION.SDK_INT >= 23) {
            String[] PERMISSIONS = {android.Manifest.permission.WRITE_EXTERNAL_STORAGE,android.Manifest.permission.READ_EXTERNAL_STORAGE,android.Manifest.permission.CAMERA};
            if (!hasPermissions(mContext, PERMISSIONS)) {
                ActivityCompat.requestPermissions((Activity) mContext, PERMISSIONS, REQUEST );
            } else {
                openCamera()
            }
        } else {
            openCamera()'
        }
    }
};

获取权限结果

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
        case REQUEST: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    openCamera();
            } else {
                Toast.makeText(mContext, "The app was not allowed to write in your storage", Toast.LENGTH_LONG).show();
            }
        }
    }
}

检查marshmallow的权限

private static boolean hasPermissions(Context context, String... permissions) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
        for (String permission : permissions) {
            if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
    }
    return true;
}

清单

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera"/>
<uses-feature android:name="android.hardware.camera.autofocus" />

openCamera Funtion

public void openCamera()
{
    Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    try {
        uri = createImageFile();


        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri);

    } catch (Exception e) {
        Log.e(TAG, TAG + ": " + e.toString());
    }           
    startActivityForResult(cameraIntent, CAMERA_REQUEST); 
}

createImageFile功能：

 public Uri  createImageFile() {
    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/TEST");
    myDir.mkdirs();
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);

    String fName = "Image_" + n + ".jpg";
    File file = new File(myDir, fName);
    if (file.exists()) {
        file.delete();
        try {
            file.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    Uri uriImage = Uri.fromFile(file);
    return uriImage;
}

Answer 3

File file = new File(Environment.getExternalStorageDirectory(), "/download/"+ GlobalVars.apkname+".apk");
System.out.println("file>>>>>"+file);
Uri fileUri = Uri.fromFile(file);

if (Build.VERSION.SDK_INT >= 24) {
    fileUri = FileProvider.getUriForFile(MainActivity.this,getPackageName(), file);
    System.out.println("File URI>>>>>"+fileUri);
    //fileUri = FileProvider.get
}

android 6.0文件提供程序无法在FileProvider.getUriForFile上运行空指针

3 个答案: