Not getting contact numbers using getContentResolver().query() in Android

I'm trying to get contact numbers using getContentResolver().query() method. but it not get any numbers. here is my code and app file.

Activity Class

    abc = (Button) findViewById(R.id.button);
    abc.setOnClickListener(new View.OnClickListener() {
        @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
        @Override
        public void onClick(View v) {
            ContentResolver contentResolver = getContentResolver();
            Cursor cursor = contentResolver.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
            try {
                if (cursor.getCount() > 0) {
                    while (cursor.moveToNext()) {
                        String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                        String contact_Id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
                        String Numbers = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                        Cursor cursor_phone = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
                                ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?" , new String[]{contact_Id}, null);

                        while (cursor_phone.moveToNext()) {
                            String phNumber = cursor_phone.getString(cursor_phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                            Numbers = phNumber;
                            int PHONE_TYPE = cursor_phone.getInt(cursor_phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.TYPE));

                            switch (PHONE_TYPE) {
                                case ContactsContract.CommonDataKinds.Phone.TYPE_HOME:
                                    Numbers += "Home" + phNumber + "\n";
                                    break;
                                case ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE:
                                    Numbers += "Mobile" + phNumber + "\n";
                                    break;
                                case ContactsContract.CommonDataKinds.Phone.TYPE_WORK:
                                    Numbers += "Work" + phNumber + "\n";
                                    break;
                            }
                        }
                        Toast toast = Toast.makeText(Context, name + Numbers, Toast.LENGTH_SHORT);
                        toast.show();

                    }

                } else {
                    Toast toast = Toast.makeText(a, "Nothing", Toast.LENGTH_SHORT);
                    toast.show();
                }
            }
            catch (Exception Ex)
            {
                Log.d(Ex.toString(),"");
            }

        }

    });

Build Gradle File

apply plugin: 'com.android.application'    
android {
    compileSdkVersion 20
    buildToolsVersion "20.0.0"

    defaultConfig {
        applicationId "com.metrolixsolutions.contactgetter"
        minSdkVersion 14
        targetSdkVersion 20
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}    

It doesn't get any numbers to cursor_phone.

You don't need the second query

    abc = (Button) findViewById(R.id.button);
abc.setOnClickListener(new View.OnClickListener() {
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    @Override
    public void onClick(View v) {
        ContentResolver contentResolver = getContentResolver();
        Cursor cursor = contentResolver.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
        try {
            if (cursor.getCount() > 0) {
                while (cursor.moveToNext()) {
                    String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                    String contact_Id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID)); // should be ContactsContract.CommonDataKinds.Phone.CONTACT_ID
                    // this is the phone number
                    String Numbers = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                    // dont do a toast inside a loop, try Log.d
                    // you will have to import Log 
                    Log.d("XYZ", "contact id " + contact_id + " number " + Numbers);
                    Toast toast = Toast.makeText(Context, name + Numbers, Toast.LENGTH_SHORT);
                    toast.show();

                }

            } else {
                Toast toast = Toast.makeText(a, "Nothing", Toast.LENGTH_SHORT);
                toast.show();
            }
        }
        catch (Exception Ex)
        {
            Log.d(Ex.toString(),"");
        }

    }

});