I want make a Util class to CheckPermission, but i'm getting some errors, i
don't know what i'm doing wrong
public class CheckPermission extends Activity {
private final Context context;
private static final String MNC = "MNC";
int permReq = 0;
String permMan = "";
public CheckPermission(Context context) {
this.context = context;
}
//perMan can be any code number higher than 0
public void requestPermission(String permRequested){
switch (permRequested) {
case "CAMERA":
//Request for Camera
this.permReq = ContextCompat.checkSelfPermission(context,
Manifest.permission.CAMERA);
this.permMan = Manifest.permission.CAMERA;
break;
case "INTERNET":
//Requesr for Internet
this.permReq = ContextCompat.checkSelfPermission(context,
Manifest.permission.INTERNET);
this.permMan = Manifest.permission.INTERNET;
break;
case "STORAGE":
//Request for group Storage - Read_External_Storage &
Write_External_Storage
this.permReq = ContextCompat.checkSelfPermission(context,
Manifest.permission_group.STORAGE);
this.permMan = Manifest.permission_group.STORAGE;
break;
case "MICROPHONE":
//Request for group Microphone - Record_Audio
this.permReq = ContextCompat.checkSelfPermission(context,
Manifest.permission_group.MICROPHONE);
this.permMan = Manifest.permission_group.MICROPHONE;
break;
case "LOCATION":
//Request for group Location - Acess_Fine_Location &
Acess_Coarse_Location
this.permReq = ContextCompat.checkSelfPermission(context,
Manifest.permission_group.LOCATION);
this.permMan = Manifest.permission_group.LOCATION;
break;
case "CALL":
//Requesr for call
this.permReq = ContextCompat.checkSelfPermission(context,
Manifest.permission.CALL_PHONE);
this.permMan = Manifest.permission.CALL_PHONE;
break;
default:
break;
}
}
public boolean hasPermission( String permRequested){
final PackageManager pm = context.getPackageManager();
if(isMNC_Or_Higher()) {
requestPermission(permRequested);
Toast.makeText(this.context, "Is MNC - permMan: " + this.permMan +
" Perm required: " + permReq, Toast.LENGTH_SHORT).show();
if (permReq != pm.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new
String[]{this.permMan}, this.permReq);
return false;
}
}
return true;
}
//check if is 6.0 or higher
public boolean isMNC_Or_Higher(){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
return true;
}
return false;
}
@Override
public void onRequestPermissionsResult(int requestCode, String[]
permissions, int[] grantResults) {
if (requestCode == this.permReq) {
if (grantResults.length == 1 &&
grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, "Permissão concedida",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Permissão negada",
Toast.LENGTH_SHORT).show();
}
} else {
super.onRequestPermissionsResult(requestCode, permissions,
grantResults);
}
}
}
ERROR:
PID: 25504 java.lang.NullPointerException: Attempt to invoke virtual method
'android.content.Context android.content.Context.getApplicationContext()'
on a null object reference at
android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:107)
at
com.dev.kamui.patrulhacomunitaria.CheckPermission.hasPermission(CheckPermission.java:68)
at
com.dev.kamui.patrulhacomunitaria.Pagina_Principal$1.onClick(Pagina_Principal.java:47)
at android.view.View.performClick(View.java:5198) at
android.view.View$PerformClick.run(View.java:21147) at
android.os.Handler.handleCallback(Handler.java:739) at
android.os.Handler.dispatchMessage(Handler.java:95) at
android.os.Looper.loop(Looper.java:148) at
android.app.ActivityThread.main(ActivityThread.java:5417) at
java.lang.reflect.Method.invoke(Native Method) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
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