activity_main.xml;

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <TextView android:text="Saat/Dakika Ayarla" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textView" />

    <Button
        android:text="Saat Ayarla"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/txtTime"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
    <TimePicker
        android:id="@+id/timePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:timePickerMode="spinner"
        android:visibility="gone" />
    <Button
        android:text="Dakika Seç"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/txtderecesec"
        android:layout_below="@+id/txtTime"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />
    <Button
        android:id="@+id/eklemsj"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Mesaj Kutusu"
        android:layout_below="@+id/txtderecesec"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />


</RelativeLayout>

fragment_sample_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:orientation="vertical">


    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Lorem ipsum dolor sit amet..."
        android:textSize="20dp" />

    <Button
        android:id="@+id/dismiss"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Dismiss" />

</LinearLayout>
MainActivity.java;
package com.example.okul.saat3;

import android.app.DatePickerDialog;
import android.app.FragmentManager;
import android.app.TimePickerDialog;
import android.support.v4.app.FragmentActivity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TimePicker;

import java.util.Calendar;


public class MainActivity extends FragmentActivity {
    String saat="00";
    String dakika="00";
    String derece1="00";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Button saatsec1txt = (Button) findViewById(R.id.txtTime);
        final Button derecesectxt=(Button) findViewById(R.id.txtderecesec);
        final Button eklemsj=(Button) findViewById(R.id.eklemsj);
        eklemsj .setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentManager fm = getFragmentManager();
                MyDialogFragment dialogFragment = new MyDialogFragment();
                dialogFragment.show(fm, "Sample Fragment");

            }
        });

        saatsec1txt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Calendar mcurrentTime = Calendar.getInstance();//
                int hour = mcurrentTime.get(Calendar.HOUR_OF_DAY);//Güncel saati aldık
                int minute = mcurrentTime.get(Calendar.MINUTE);//Güncel dakikayı aldık
                TimePickerDialog timePicker; //Time Picker referansımızı oluşturduk

                //TimePicker objemizi oluşturuyor ve click listener ekliyoruz
                timePicker = new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
                    @Override
                    public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
                        saat=Integer.toString(selectedHour);
                        dakika=Integer.toString(selectedMinute);
                        if(saat.length()==1){
                            saat="0"+saat;
                        }
                        if(dakika.length()==1){
                            dakika="0"+dakika;
                        }
                        saatsec1txt.setText(saat + ":" + dakika);//Ayarla butonu tıklandığında textview'a yazdırıyoruz
                    }
                }, hour, minute, true);//true 24 saatli sistem için
                timePicker.setTitle("Saat Seçiniz");
                timePicker.setButton(DatePickerDialog.BUTTON_POSITIVE, "Ayarla", timePicker);
                timePicker.setButton(DatePickerDialog.BUTTON_NEGATIVE, "İptal", timePicker);

                timePicker.show();
            }
        });
        derecesectxt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int derece = 10;

                TimePickerDialog derecepicker;
                derecepicker = new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
                    @Override
                    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {

                        derece1 = Integer.toString(minute);
                        derecesectxt.setText(derece1);

                    }
                }, 0, derece, true);

                derecepicker.setTitle("Dakika Seç");
                derecepicker.setButton(DatePickerDialog.BUTTON_POSITIVE, "Ayarla", derecepicker);
                derecepicker.setButton(DatePickerDialog.BUTTON_NEGATIVE, "İptal", derecepicker);
                derecepicker.show();
            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

}

MyDialogFragment.java;
package com.example.okul.saat3;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

/**
 * Created by okul on 4.6.2016.
 */
public class MyDialogFragment extends DialogFragment{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_sample_dialog, container, false);
        getDialog().setTitle("Simple Dialog");
        Button dismiss = (Button) rootView.findViewById(R.id.dismiss);
        dismiss.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                dismiss();
            }
        });
        return rootView;

    }
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle("Mesaj Kutusu");
        builder.setMessage("Buraya Mesajını yaz");

        builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dismiss();
            }
        });

        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dismiss();
            }
        });

        return builder.create();
    }

}

AndroidManifest.xml;
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.okul.saat3" >

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
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