我遇到Android 6.0 = PERMISSION_NOT_GRANTED
的问题P.S。我发现问题与联系和位置许可有关，有人知道如何修复它吗？
我可以从JSON获取DATA，但由于PERMISSION_NOT_GRANTED异常，我无法向数据库发送信息。
public class DVLAresult extends AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCallback{
private ProgressDialog progress;
GPSTracker gps;
RequestQueue requestQueue;
String insertUrl = "http://zonec.net/project/insertDetails.php";
double latitudeD;
double longitudeD;
String postCode;
private DVLAInformation dvlaInfo = null;
//DVLA Plate Number
String dvlaPlateNumber;
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dvlaresult);
//Intent dvla from Index class
Intent intent = getIntent();
dvlaPlateNumber = intent.getStringExtra("dvlaNumber");
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_my_contacts, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Intent intentURL = new Intent(Intent.ACTION_VIEW);
//Set URL for similar car, based on retrieved information from current car
String URL = ("http://www.autotrader.co.uk/search/used/cars/" + dvlaInfo.getMake() + "/postcode/" + postCode + "/radius/5/sort/default/onesearchad/used%2Cnearlynew%2Cnew/page/1/searchcontext/default/colour/" + dvlaInfo.getColour().toLowerCase() + "/fuel-type/" + dvlaInfo.getFuelType().toLowerCase() + "");
intentURL.setData(Uri.parse(URL));
switch (item.getItemId()) {
//Panel button which redirect to website with similar car which yser currently was looking for.
case R.id.action_check_similar:
startActivity(intentURL);
return true;
//Panel button, redirect to report about this application or any other issue
case R.id.action_report:
startActivity(new Intent(this, Report.class));
return true;
//Panel button, redirect to subscribe web-page
case R.id.action_subscribe:
startActivity(new Intent(this, Subscribe.class));
return true;
}
return super.onOptionsItemSelected(item);
}
public void sendGetRequest(View v) {
//EXECUTE JSON
new GetClass(this).execute();
}
@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.
client.connect();
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"DVLAresult 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 URL is correct.
Uri.parse("android-app://com.sandro.openalprsample/http/host/path")
);
AppIndex.AppIndexApi.start(client, 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.
"DVLAresult 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 URL is correct.
Uri.parse("android-app://com.sandro.openalprsample/http/host/path")
);
AppIndex.AppIndexApi.end(client, viewAction);
client.disconnect();
}
private class GetClass extends AsyncTask<String, Void, DVLAInformation> {
private final Context context;
public GetClass(Context c) {
this.context = c;
}
protected void onPreExecute() {
progress = new ProgressDialog(this.context);
progress.setMessage(getString(R.string.LoadMethod));
progress.show();
}
//[START] Get DVLA information from website database by using url.
@Override
protected DVLAInformation doInBackground(String... params) {
try {
//URL from which information was retrieved.
final URL url = new URL("https://dvlasearch.appspot.com/DvlaSearch?licencePlate=" + dvlaPlateNumber + "&apikey=d47OE2WB4nqgPQN6");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//Set connection
connection.setRequestMethod("GET");
connection.setRequestProperty("USER-AGENT", "Mozilla/5.0");
connection.setRequestProperty("ACCEPT-LANGUAGE", "en-US,en;0.5");
BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
StringBuilder responseOutput = new StringBuilder();
while ((line = br.readLine()) != null) {
responseOutput.append(line);
}
br.close();
//Read and parse JSON and responce to string
DVLAInformation obj = new DVLAInformation(url.toString());
obj.readAndParseJSON(responseOutput.toString());
return obj;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
//[END] Get DVLA information from website database by using url.
@Override
protected void onPostExecute(final DVLAInformation obj) {
dvlaInfo = obj;
final TextView outputView = (TextView) findViewById(R.id.showOutput);
outputView.setText(obj.toString());
progress.dismiss();
//[START] Get DVLA information from JSON
final StringBuilder output = new StringBuilder(obj.getUrl());
output.append(System.getProperty("line.separator"));
output.append("\n").append(System.getProperty("line.separator"));
output.append("Make : ").append(obj.getMake());
output.append("\nModel : ").append(obj.getModel());
output.append("\nSix Month Rate : ").append(obj.getSixMonthRate());
output.append("\nTwelve Month Rate : ").append(obj.getTwelveMonthRate());
output.append("\nDate of First Registration : ").append(obj.getDateofFirstRegistrationegistration());
output.append("\nYear of Manufacture : ").append(obj.getYearOfManufacture());
output.append("\nCylinder Capacity : ").append(obj.getCylinderCapacity());
output.append("\nCO2 Emmissions : ").append(obj.getCo2Emissions());
output.append("\nVIN number : ").append(obj.getVin());
output.append("\nTransmission type : ").append(obj.getTransmission());
output.append("\nFuel Type : ").append(obj.getFuelType());
output.append("\nTax Status : ").append(obj.getTaxStatus());
output.append("\nColour : ").append(obj.getColour());
output.append("\nType Approval : ").append(obj.getTypeApproval());
output.append("\nWheel Plan : ").append(obj.getWheelPlan());
output.append("\nRevenue Weight : ").append(obj.getRevenueWeight());
output.append("\nTax Details : ").append(obj.getTaxDetails());
output.append("\nMOT Details : ").append(obj.getMotDetails());
output.append("\nTaxed : ").append(obj.getTaxed());
output.append("\nMOT : ").append(obj.getMot());
//[END] Get DVLA information from JSON
//[START] Get GPS Location.
gps = new GPSTracker(DVLAresult.this);
latitudeD = gps.getLatitude();
longitudeD = gps.getLongitude();
gps.stopUsingGPS();
Geocoder geoCoder = new Geocoder(getApplicationContext(), Locale.getDefault());
List<Address> address = null;
try {
address = geoCoder.getFromLocation(latitudeD, longitudeD, 1);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
assert address != null;
if (address.size() > 0) {
postCode = address.get(0).getPostalCode();
}
//[END] Get GPS Location
//[START] SEND values to database
requestQueue = Volley.newRequestQueue(getApplicationContext());
StringRequest request = new StringRequest(Request.Method.POST, insertUrl, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
System.out.println(response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}) {
// [START] SEND values to database
@Override
protected Map<String, String> getParams() throws AuthFailureError {
//Get values from Index activity
Intent intent = getIntent();
//Radio button choice
String radioChoice = intent.getStringExtra("radioChosen");
//Recognition confidence of the plate
String confidence = intent.getStringExtra("confidenceResult");
//Unchanged recognised plate number
String plateNumberUn = intent.getStringExtra("plateNumberResult");
//Google user details (ID, Name, Email)
Intent intentG = getIntent();
String userIdG = intentG.getStringExtra("userIdGresult");
String userNameG = intentG.getStringExtra("userNameGresult");
String userEmailG = intentG.getStringExtra("userEmailGresult");
//Values which will be used to insert to database
Map<String, String> parameters = new HashMap<>();
parameters.put("userIdG", userIdG);
parameters.put("userNameG", userNameG);
parameters.put("userEmailG", userEmailG);
parameters.put("latitude", String.valueOf(latitudeD));
parameters.put("longitude", String.valueOf(longitudeD));
parameters.put("postCode", postCode);
parameters.put("doWithCar", radioChoice);
parameters.put("plateNumber", dvlaPlateNumber);
parameters.put("confidencePlate", confidence);
parameters.put("plateNumberUn", plateNumberUn);
parameters.put("make", dvlaInfo.getMake());
parameters.put("model", dvlaInfo.getModel());
parameters.put("twelveMonthRate", dvlaInfo.getTwelveMonthRate());
parameters.put("yearOfManufacture", dvlaInfo.getYearOfManufacture());
parameters.put("cylinderCapacity", dvlaInfo.getCylinderCapacity());
parameters.put("dateofFirstRegistration", dvlaInfo.getDateofFirstRegistrationegistration());
parameters.put("co2Emissions", dvlaInfo.getCo2Emissions());
parameters.put("fuelType", dvlaInfo.getFuelType());
parameters.put("colour", dvlaInfo.getColour());
parameters.put("mot", dvlaInfo.getMot());
parameters.put("motDetails", dvlaInfo.getMotDetails());
parameters.put("vin", dvlaInfo.getVin());
parameters.put("transmission", dvlaInfo.getTransmission());
parameters.put("sixMonthRate", dvlaInfo.getSixMonthRate());
parameters.put("taxStatus", dvlaInfo.getTaxStatus());
parameters.put("wheelPlan", dvlaInfo.getWheelPlan());
parameters.put("revenueWeight", dvlaInfo.getRevenueWeight());
parameters.put("typeApproval", dvlaInfo.getTypeApproval());
parameters.put("taxed", dvlaInfo.getTaxed());
parameters.put("taxDetails", dvlaInfo.getTaxDetails());
return parameters;
}
};
//[END] SEND values to database
requestQueue.add(request);
DVLAresult.this.runOnUiThread(new Runnable() {
@Override
public void run() {
outputView.setText(output);
progress.dismiss();
}
});
}
}
}
我想到了权限问题，但是在尝试向数据库发送信息时，android没有请求权限。
我有互联网权限：
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
错误如下所示：
04-25 03:01:25.611 29073-29808/com.sandro.openalprsample E/Volley: [615] NetworkDispatcher.run: Unhandled exception java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
at libcore.net.UriCodec.encode(UriCodec.java:132)
at java.net.URLEncoder.encode(URLEncoder.java:57)
at com.android.volley.Request.encodeParameters(Request.java:480)
at com.android.volley.Request.getBody(Request.java:466)
at com.android.volley.toolbox.HurlStack.addBodyIfExists(HurlStack.java:236)
at com.android.volley.toolbox.HurlStack.setConnectionParametersForRequest(HurlStack.java:210)
at com.android.volley.toolbox.HurlStack.performRequest(HurlStack.java:106)
at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:96)
at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:112)
我试过这个，但它不起作用：
public boolean isStoragePermissionGranted() {
if (Build.VERSION.SDK_INT >= 23) {
if (checkSelfPermission(android.Manifest.permission.WRITE_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.WRITE_EXTERNAL_STORAGE}, 1);
return false;
}
}
else { //permission is automatically granted on sdk<23 upon installation
Log.v(TAG,"Permission is granted");
return true;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(grantResults[0]== PackageManager.PERMISSION_GRANTED){
Log.v(TAG,"Permission: "+permissions[0]+ "was "+grantResults[0]);
//resume tasks needing this permission
}
}
答案 0 :(得分：1)
显然。您的targetSdkVersion的目标是23，您需要使用android.permission.WRITE_EXTERNAL_STORAGE的运行时权限
Android 6.0包含运行时权限功能。某些权限被视为危险权限，需要在运行时请求。 android.permission.WRITE_EXTERNAL_STORAGE就是其中之一。
您可以从Normal and Dangerous Permissions了解哪些权限是危险的，哪些权限是正常的。
您可以从此处了解如何使用Android运行时权限：Requesting Permissions at Run Time。