通過拍攝來自相機的照片在onActivityResult中獲得null null

我在我的應用程序中創建了一個從相機拍照的類。該課程將使用相機拍攝照片並將其存儲在具有唯一名稱的文件夾中。但是，當我想要得到圖片路徑onActivityResult方法Iget空data一直！通過拍攝來自相機的照片在onActivityResult中獲得null null

這是我的照相機：

public class Camera{ 

    private Activity activity; 
    private SystemTools systemTools; 


    public Camera(Context context) { 

    this.activity = (Activity) context; 
    systemTools = new SystemTools(); 
    } 

    /** 
    * This Method will take a picture with camera for us 
    */ 

    public void takePicture() { 

    boolean cameraAvailable = systemTools.device_isHardwareFeatureAvailable(activity, PackageManager.FEATURE_CAMERA); 

    if (cameraAvailable && 
     systemTools.system_isIntentAvailable(activity, MediaStore.ACTION_IMAGE_CAPTURE)) { 

     Intent takePicIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 

     //We prepare the intent to store the taken picture 
     try { 

     File outputDir = systemTools.storage_getExternalPublicFolder("ReportsAttachments", true); 
     File outFile = systemTools.storage_createUniqueFileName("cameraPic", ".jpg", outputDir); 

     takePicIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(outFile)); 

     } catch (Exception e) { 
     Toast.makeText(activity, "در دریافت تصویر اشکالی رخ داده است ، لطفا دوباره تلاش کنید.", Toast.LENGTH_SHORT).show(); 
     } 

     activity.startActivityForResult(takePicIntent, App.REQUEST_IMAGE_CAPTURE); 


    } else { 
     if (cameraAvailable) { 
     Toast.makeText(activity, "برنامه ی دوربین دستگاه خراب است.", Toast.LENGTH_SHORT).show(); 

     } else { 
     Toast.makeText(activity, "دسترسی به دوربین سیستم امکان پذیر نمی باشد.", Toast.LENGTH_SHORT).show(); 
     } 
    } 
    } 
}

的I設在活動onActivityResult()方法，我用相機。像這樣：

@Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    try { 
     if (requestCode == App.REQUEST_IMAGE_CAPTURE) { 
     if (resultCode == Activity.RESULT_OK && data != null) { 
      Log.i("ATTACH", "In Result"); 

      Bitmap bmp = (Bitmap) data.getExtras().get("data"); 
      ByteArrayOutputStream stream = new ByteArrayOutputStream(); 

      // CALL THIS METHOD TO GET THE URI FROM THE BITMAP 
      Uri selectedImage = getImageUri(this, bmp); 
      String realPath = getRealPathFromURI(selectedImage); 
      selectedImage = Uri.parse(realPath); 
      presenter.onNewAttachmentRequest(selectedImage.getPath()); 


     } 
     } 
    } catch (Exception e) { 
     Log.i("ATTACH", e + " Something went wrong"); 
    } 
    }

能正常工作和抽放pictre是SD_Card avaliable，但是當我想要得到的圖片的路徑我cant't因爲onActivityResult「數據」爲空所有的時間！這段代碼的問題在哪裏？

謝謝。

來源

2017-09-26 Ehsan

請確保您有存儲的權限，即讀寫權限，如果您的設備是marshmellow或以上，然後請添加運行時權限 –

我得到了所有權限。但它不起作用。 – Ehsan

takePicIntent.putExtra（MediaStore.EXTRA_OUTPUT，Uri.fromFile（outFile））;

正如您所看到的，您已將文件Uri傳遞給intent，即Camera應用程序將在此路徑中寫入拍攝的圖像，並且不會返回位圖。只需將該路徑保存爲全局的並在onActivityResult（）中使用它即可。您需要添加這也導致相機應用程序依賴於設備。

takePicIntent.putExtra（「return-data」，false）;

來源

2017-09-26 11:08:21 ADM

「ACTION_IMAGE_CAPTURE」沒有額外記錄的「返回數據」。 – CommonsWare

是的，我知道。它沒有它就會工作。我正面臨一些與Moto E相機意圖有關的問題，那麼這就是我發現的 – ADM

當我想要得到的圖片

的路徑你已經有圖片的路徑。它是outFile。將它保存在一個字段中，並通過配置更改保存它。此外，由於Uri.fromFile()不會在Android 7.0+特別好工作，可考慮改用FileProvider，正如我在下面做活動從this sample project：

/*** 
Copyright (c) 2008-2017 CommonsWare, LLC 
Licensed under the Apache License, Version 2.0 (the "License"); you may not 
use this file except in compliance with the License. You may obtain a copy 
of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required 
by applicable law or agreed to in writing, software distributed under the 
License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS 
OF ANY KIND, either express or implied. See the License for the specific 
language governing permissions and limitations under the License. 

Covered in detail in the book _The Busy Coder's Guide to Android Development_ 
https://commonsware.com/Android 
*/ 

package com.commonsware.android.camcon; 

import android.Manifest; 
import android.app.Activity; 
import android.content.ActivityNotFoundException; 
import android.content.ClipData; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.content.pm.ResolveInfo; 
import android.net.Uri; 
import android.os.Build; 
import android.os.Bundle; 
import android.provider.MediaStore; 
import android.support.v4.content.FileProvider; 
import android.widget.Toast; 
import java.io.File; 
import java.util.List; 

public class MainActivity extends Activity { 
    private static final String EXTRA_FILENAME= 
    "com.commonsware.android.camcon.EXTRA_FILENAME"; 
    private static final String FILENAME="CameraContentDemo.jpeg"; 
    private static final int CONTENT_REQUEST=1337; 
    private static final String AUTHORITY= 
    BuildConfig.APPLICATION_ID+".provider"; 
    private static final String PHOTOS="photos"; 
    private File output=null; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    if (savedInstanceState==null) { 
     output=new File(new File(getFilesDir(), PHOTOS), FILENAME); 

     if (output.exists()) { 
     output.delete(); 
     } 
     else { 
     output.getParentFile().mkdirs(); 
     } 

     Intent i=new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
     Uri outputUri=FileProvider.getUriForFile(this, AUTHORITY, output); 

     i.putExtra(MediaStore.EXTRA_OUTPUT, outputUri); 

     if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.LOLLIPOP) { 
     i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION); 
     } 
     else if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.JELLY_BEAN) { 
     ClipData clip= 
      ClipData.newUri(getContentResolver(), "A photo", outputUri); 

     i.setClipData(clip); 
     i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION); 
     } 
     else { 
     List<ResolveInfo> resInfoList= 
      getPackageManager() 
      .queryIntentActivities(i, PackageManager.MATCH_DEFAULT_ONLY); 

     for (ResolveInfo resolveInfo : resInfoList) { 
      String packageName = resolveInfo.activityInfo.packageName; 
      grantUriPermission(packageName, outputUri, 
      Intent.FLAG_GRANT_WRITE_URI_PERMISSION); 
     } 
     } 

     try { 
     startActivityForResult(i, CONTENT_REQUEST); 
     } 
     catch (ActivityNotFoundException e) { 
     Toast.makeText(this, R.string.msg_no_camera, Toast.LENGTH_LONG).show(); 
     finish(); 
     } 
    } 
    else { 
     output=(File)savedInstanceState.getSerializable(EXTRA_FILENAME); 
    } 
    } 

    @Override 
    protected void onSaveInstanceState(Bundle outState) { 
    super.onSaveInstanceState(outState); 

    outState.putSerializable(EXTRA_FILENAME, output); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, 
            Intent data) { 
    if (requestCode == CONTENT_REQUEST) { 
     if (resultCode == RESULT_OK) { 
     Intent i=new Intent(Intent.ACTION_VIEW); 
     Uri outputUri=FileProvider.getUriForFile(this, AUTHORITY, output); 

     i.setDataAndType(outputUri, "image/jpeg"); 
     i.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); 

     try { 
      startActivity(i); 
     } 
     catch (ActivityNotFoundException e) { 
      Toast.makeText(this, R.string.msg_no_viewer, Toast.LENGTH_LONG).show(); 
     } 

     finish(); 
     } 
    } 
    } 
}

來源

2017-09-26 11:10:35 CommonsWare

謝謝，我知道我有圖像路徑，但是我已經在Camera類中擁有它了！我想在我使用Camera類的Activity中訪問它。 – Ehsan

@Ehsan：在攝像頭類上放置一個吸氣劑以返回路徑。或者讓活動決定路徑並將其傳遞給'Camera'對象。 – CommonsWare

通過拍攝來自相機的照片在onActivityResult中獲得null null

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