上传文件时无法访问外部存储

Question

我想将文件上传到ftp。我正在使用此代码。但每次我尝试从存储器中取出图像时，它总是会让我无法选择文件。在我将android studio从android studio 1.5升级到最新版之后，发生了这种情况。我也降级了gradle build，但这并不能解决问题。你能告诉我为什么会发生这种情况？

Manifest.java

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.amobi.newlomapodfix"> 

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

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity 
      android:name=".MainActivity" 
      android:label="Article" 
      android:theme="@style/AppTheme.NoActionBar"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity 
      android:name=".ShopActivity" 
      android:label="Shop" 
      android:theme="@style/AppTheme.NoActionBar" /> 
     <activity 
      android:name=".ReadArtikelActivity" 
      android:label="Article" /> 
     <activity 
      android:name=".SignUpActivity" 
      android:label="Register" /> 
     <activity 
      android:name=".LoginActivity" 
      android:label="Login" /> 
     <activity 
      android:name=".AccountActivity" 
      android:label="@string/title_activity_account" 
      android:theme="@style/AppTheme.NoActionBar" /> 
     <activity android:name=".EditAccountActivity" /> 
     <activity android:name=".UploadActivity" /> 
     <activity android:name=".CartActivity" /> 
     <activity android:name=".DetilBarangActivity"></activity> 
     <!-- ATTENTION: This was auto-generated to add Google Play services to your project for 
      App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information. --> 
     <meta-data 
      android:name="com.google.android.gms.version" 
      android:value="@integer/google_play_services_version" /> 
    </application> 

</manifest> 

UploadActivity.java

import android.app.ProgressDialog; 
import android.content.Intent; 
import android.database.Cursor; 
import android.graphics.BitmapFactory; 
import android.net.Uri; 
import android.os.AsyncTask; 
import android.os.StrictMode; 
import android.provider.MediaStore; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.Toast; 

import com.amobi.newlomapodfix.util.SessionManagement; 
import com.google.android.gms.appindexing.Action; 
import com.google.android.gms.appindexing.AppIndex; 
import com.google.android.gms.common.api.GoogleApiClient; 

import org.apache.http.NameValuePair; 
import org.apache.http.message.BasicNameValuePair; 
import org.jibble.simpleftp.SimpleFTP; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.io.File; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

public class UploadActivity extends AppCompatActivity { 

    private static final String URL_ID_TRANS = "http://amobipets.azurewebsites.net/getIdImage.php"; 
    private static final String URL_INSERT_IMAGE = "http://amobipets.azurewebsites.net/insertImage.php"; 
    private static final String URL_EDIT_TRANS = "http://amobipets.azurewebsites.net/editTrans.php"; 
    private static final String TAG_ID = "id"; 
    private static final String TAG_IMAGE_NAME = "image_name"; 
    private static final String TAG_STATUS = "Status"; 
    private static final String TAG_PESAN = "message"; 
    private static final String TAG_HASIL = "result"; 
    private static final String TAG_TRANS = "message"; 
    private static final String TAG_IMAGE_ID = "id_image"; 
    ProgressDialog pDialog; 

    JSONParser jparser = new JSONParser(); 
    ArrayList<HashMap<String, String>> namelist, idList, imageList; 
    JSONArray names, names1, names2; 

    private static int RESULT_LOAD_IMG = 1; 
    String imgDecodableString = null; 
    Button btn; 


    static final String FTP_HOST = "************"; 
    static final String FTP_USER = "************"; 
    static final String FTP_PASS = "************"; 
    String name, vid; 
    /** 
    * ATTENTION: This was auto-generated to implement the App Indexing API. 
    * See https://g.co/AppIndexing/AndroidStudio for more information. 
    */ 
    private GoogleApiClient client2; 
    SessionManagement sessionManagement; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_upload); 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setHomeButtonEnabled(true); 

     sessionManagement =new SessionManagement(this); 
     idList = new ArrayList<HashMap<String, String>>(); 
     imageList = new ArrayList<HashMap<String, String>>(); 

     Bundle bun = getIntent().getExtras(); 
     vid = bun.getString("id"); 

     btn = (Button) findViewById(R.id.buttonUploadPicture); 
     btn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       if (imgDecodableString == null) { 
        Toast.makeText(UploadActivity.this, "Choose image first, please", Toast.LENGTH_LONG); 
       } else { 
        File f = new File(imgDecodableString); 
        name = f.getName(); 
        uploadFile(f); 
       } 
      } 
     }); 

     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     client2 = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build(); 
    } 


    public void loadImagefromGallery(View view) { 
     // Create intent to Open Image applications like Gallery, Google Photos 
     Intent galleryIntent = new Intent(Intent.ACTION_PICK, 
       MediaStore.Images.Media.EXTERNAL_CONTENT_URI); 
     // Start the Intent 
     startActivityForResult(galleryIntent, RESULT_LOAD_IMG); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     try { 
      // When an Image is picked 
      if (requestCode == RESULT_LOAD_IMG && resultCode == RESULT_OK 
        && null != data) { 
       // Get the Image from data 


       Uri selectedImage = data.getData(); 
       String[] filePathColumn = {MediaStore.Images.Media.DATA}; 

       // Get the cursor 
       Cursor cursor = getContentResolver().query(selectedImage, 
         filePathColumn, null, null, null); 
       // Move to first row 
       cursor.moveToFirst(); 

       int columnIndex = cursor.getColumnIndex(filePathColumn[0]); 
       String filename = cursor.getString(columnIndex); 
       imgDecodableString = cursor.getString(columnIndex); 
       cursor.close(); 

       File f = new File("" + imgDecodableString); 
       f.getName(); 
       ImageView imgView = (ImageView) findViewById(R.id.imgView); 
       // Set the Image in ImageView after decoding the String 
       imgView.setImageBitmap(BitmapFactory 
         .decodeFile(imgDecodableString)); 

      } else { 
       Toast.makeText(this, "Pilih Bukti Transaksi", 
         Toast.LENGTH_LONG).show(); 
      } 
     } catch (Exception e) { 
      Toast.makeText(this, "Failed to Choose", Toast.LENGTH_LONG) 
        .show(); 
     } 
    } 

    public void uploadFile(File fileName) { 

     StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
     StrictMode.setThreadPolicy(policy); 
     SimpleFTP ftp=new SimpleFTP(); 

     try { 
      ftp.connect(FTP_HOST, 21, FTP_USER, FTP_PASS); 
      ftp.bin(); 
      ftp.cwd("/img/"); 
      ftp.stor(fileName); 
      ftp.disconnect(); 

     } catch (Exception e) { 
      e.printStackTrace(); 
      try { 
       ftp.disconnect(); 
       Toast.makeText(UploadActivity.this, "disconnect", Toast.LENGTH_LONG).show(); 
      } catch (Exception e2) { 
       e2.printStackTrace(); 
       Toast.makeText(UploadActivity.this, "failed", Toast.LENGTH_LONG).show(); 
      } 
     } 

    } 

    @Override 
    public void onStart() { 
     super.onStart(); 

     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     client2.connect(); 
     Action viewAction = Action.newAction(
       Action.TYPE_VIEW, // TODO: choose an action type. 
       "Upload Page", // TODO: Define a title for the content shown. 
       // TODO: If you have web page content that matches this app activity's content, 
       // make sure this auto-generated web page URL is correct. 
       // Otherwise, set the URL to null. 
       Uri.parse("http://host/path"), 
       // TODO: Make sure this auto-generated app deep link URI is correct. 
       Uri.parse("android-app://com.amobi.newlomapodfix/http/host/path") 
     ); 
     AppIndex.AppIndexApi.start(client2, viewAction); 
    } 

    @Override 
    public void onStop() { 
     super.onStop(); 

     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     Action viewAction = Action.newAction(
       Action.TYPE_VIEW, // TODO: choose an action type. 
       "Upload Page", // TODO: Define a title for the content shown. 
       // TODO: If you have web page content that matches this app activity's content, 
       // make sure this auto-generated web page URL is correct. 
       // Otherwise, set the URL to null. 
       Uri.parse("http://host/path"), 
       // TODO: Make sure this auto-generated app deep link URI is correct. 
       Uri.parse("android-app://com.amobi.newlomapodfix/http/host/path") 
     ); 
     AppIndex.AppIndexApi.end(client2, viewAction); 
     client2.disconnect(); 
    } 

    /******* 
    * Used to file upload and show progress 
    **********/ 

    /* public class MyTransferListener implements FTPDataTransferListener { 

     public void started() { 

      btn.setVisibility(View.GONE); 
      // Transfer started 
      Toast.makeText(getBaseContext(), " Upload Started ...", Toast.LENGTH_SHORT).show(); 

     } 

     public void transferred(int length) { 

      // Yet other length bytes has been transferred since the last time this 
      // method was called 
      Toast.makeText(getBaseContext(), " transferred ..." + length, Toast.LENGTH_SHORT).show(); 
     } 

     public void completed() { 

      btn.setVisibility(View.VISIBLE); 
      // Transfer completed 

      Toast.makeText(getBaseContext(), " completed ...", Toast.LENGTH_LONG).show(); 

      new InsertImage(name).execute(); 

     } 

     public void aborted() { 

      btn.setVisibility(View.VISIBLE); 
      // Transfer aborted 
      Toast.makeText(getBaseContext(), " transfer aborted , please try again...", Toast.LENGTH_SHORT).show(); 
     } 

     public void failed() { 

      btn.setVisibility(View.VISIBLE); 
      // Transfer failed 
      System.out.println(" failed ..."); 
     } 
    } 
*/ 
    class InsertImage extends AsyncTask<String, String, String> { 
     int sukses = 0; 
     String img; 

     public InsertImage(String img) { 
      this.img = img; 
     } 

     @Override 
     protected void onPreExecute() { 
     } 

     @Override 
     protected String doInBackground(String... args) { 
      List<NameValuePair> params = new ArrayList<NameValuePair>(); 

      params.add(new BasicNameValuePair("image_name", img)); 
      try { 
       JSONObject json = jparser.makeHttpRequest(URL_INSERT_IMAGE, "GET", params); 

       if (json != null) { 
        sukses = json.getInt(TAG_PESAN); 

        if (sukses == 1) { 
         namelist = new ArrayList<HashMap<String, String>>(); 
         Log.d("Semua Nama: ", json.toString()); 
         names = json.getJSONArray(TAG_HASIL); 

         for (int i = 0; i < names.length(); i++) { 
          JSONObject c = names.getJSONObject(i); 
          String img = c.getString(TAG_IMAGE_NAME); 
          HashMap<String, String> map = new HashMap<String, String>(); 

          map.put(TAG_IMAGE_NAME, img); 

          namelist.add(map); 
         } 
        } 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
      return null; 
     } 

     @Override 
     protected void onPostExecute(String file_url) { 

      if (sukses == 1) { 
       new getID().execute(); 
      } 
     } 
    } 

    public class getID extends AsyncTask<String, String, String> { 

     int sukses = 0; 

     public getID() { 
      pDialog = new ProgressDialog(UploadActivity.this); 
     } 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pDialog.setMessage("Loading . . ."); 
      pDialog.setIndeterminate(false); 
      pDialog.setCancelable(false); 
      pDialog.show(); 
     } 

     @Override 
     protected String doInBackground(String... args) { 

      List<NameValuePair> params = new ArrayList<NameValuePair>(); 
      try { 
       JSONObject json = jparser.makeHttpRequest(URL_ID_TRANS, "GET", params); 
       if (json != null) { 
        sukses = json.getInt(TAG_PESAN); 
        if (sukses == 1) { 
         idList = new ArrayList<HashMap<String, String>>(); 
         Log.d("Semua Nama: ", json.toString()); 
         names1 = json.getJSONArray(TAG_HASIL); 

         for (int i = 0; i < names1.length(); i++) { 
          JSONObject c = names1.getJSONObject(i); 
          String id = c.getString(TAG_ID); 

          HashMap<String, String> map = new HashMap<String, String>(); 

          map.put(TAG_ID, id); 
          idList.add(map); 
         } 
        } 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 

      return null; 
     } 

     @Override 
     protected void onPostExecute(String s) { 
      pDialog.dismiss(); 
      String id_image; 
      if(idList.size()==0) 
      { 
       id_image="1"; 
      } 
      else {id_image = idList.get(0).get(TAG_ID);} 
      new editTrans(id_image, "Uploaded", vid).execute(); 
     } 
    } 

    class editTrans extends AsyncTask<String, String, String> { 
     int sukses = 0; 
     String id_image, status, id_trans; 

     public editTrans(String id_image, String status, String id_trans) { 
      this.id_image = id_image; 
      this.status = status; 
      this.id_trans = id_trans; 
     } 

     @Override 
     protected void onPreExecute() { 
     } 

     @Override 
     protected String doInBackground(String... args) { 
      List<NameValuePair> params = new ArrayList<NameValuePair>(); 

      params.add(new BasicNameValuePair("id_image", id_image)); 
      params.add(new BasicNameValuePair("Status", status)); 
      params.add(new BasicNameValuePair("id_trans", id_trans)); 

      try { 
       JSONObject json = jparser.makeHttpRequest(URL_EDIT_TRANS, "GET", params); 

       if (json != null) { 
        sukses = json.getInt(TAG_PESAN); 

        if (sukses == 1) { 
         imageList = new ArrayList<HashMap<String, String>>(); 
         Log.d("Semua Nama: ", json.toString()); 
         names2 = json.getJSONArray(TAG_HASIL); 

         for (int i = 0; i < names2.length(); i++) { 
          JSONObject c = names2.getJSONObject(i); 
          String stat = c.getString(TAG_STATUS); 
          String image = c.getString(TAG_IMAGE_ID); 
          HashMap<String, String> map = new HashMap<String, String>(); 

          map.put(TAG_IMAGE_ID, image); 
          map.put(TAG_STATUS, stat); 

          imageList.add(map); 
         } 
        } 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
      return null; 
     } 

     @Override 
     protected void onPostExecute(String file_url) { 

      if (sukses == 1) { 
       Intent i = new Intent(UploadActivity.this, AccountActivity.class); 
       startActivity(i); 
      } 
     } 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
      case android.R.id.home: 
       finish(); 
       return true; 
      case R.id.action_settings: 
       return true; 
      case R.id.logout: 
       sessionManagement.logoutUser(); 
       return true; 
      default: 
       return super.onOptionsItemSelected(item); 
     } 
    } 
} 

的build.gradle

应用插件： 'com.android.application'

android { 
    compileSdkVersion 23 
    buildToolsVersion "23.0.2" 

    defaultConfig { 
     applicationId "com.amobi.newlomapodfix" 
     minSdkVersion 17 
     targetSdkVersion 23 
     versionCode 1 
     versionName "1.0" 
    } 
    buildTypes { 
     release { 
      minifyEnabled false 
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 
     } 
    } 

    lintOptions { 
     abortOnError false 
    } 
} 

dependencies { 
    compile fileTree(include: ['*.jar'], dir: 'libs') 
    testCompile 'junit:junit:4.12' 
    compile project(':captcha') 
    compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2' 
    compile 'com.android.support:recyclerview-v7:23.1.1' 
    compile 'com.android.support:support-v4:23.2.1' 
    compile 'com.android.support:appcompat-v7:23.1.1' 
    compile 'com.android.support:design:23.2.1' 
    compile 'com.squareup.picasso:picasso:2.5.2' 
    compile 'com.squareup.retrofit:retrofit:1.9.0' 
    compile 'com.android.support:cardview-v7:23.1.1' 
    compile 'com.google.android.gms:play-services-appindexing:8.1.0' 
    compile files('libs/simpleftp.jar') 
} 

Answer 1

你是针对API 23必须y欧得低于

 private static final int REQUEST_RUNTIME_PERMISSION = 1; 
     // Global Variable 

     void checkPremission() { 
      //select which permission you want 
      final String permission = Manifest.permission.WRITE_EXTERNAL_STORAGE; 
       // if in fragment use getActivity() 
      if (ContextCompat.checkSelfPermission(ActivityName.this, permission) 
        != PackageManager.PERMISSION_GRANTED) { 
       if (ActivityCompat.shouldShowRequestPermissionRationale(ActivityName.this, permission)) { 

       } else { 
        ActivityCompat.requestPermissions(ActivityName.this, new String[]{permission}, REQUEST_CAMERA_PERMISSION); 
       } 
      } else { 
       // you have permission go ahead 
       // get access to storage 
      } 
     } 

     @Override 
     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { 
      switch (requestCode) { 
       case REQUEST_RUNTIME_PERMISSION: 
        final int numOfRequest = grantResults.length; 
        final boolean isGranted = numOfRequest == 1 
          && PackageManager.PERMISSION_GRANTED == grantResults[numOfRequest - 1]; 
        if (isGranted) { 
         // you have permission go ahead 
         // get access to storage 

        }else{ 
         // you dont have permission show toast 
        } 
        break; 
       default: 
        super.onRequestPermissionsResult(requestCode, permissions, grantResults); 
      } 
     } 
    }