No Job Of Star

public abstract class BaseActivity extends AppCompatActivity  {

    protected ProgressDialog mProgressDialog = null;

    protected abstract Context getContext();

    /**
     * 프로그래스를 보여준다.
     */
    public void showProgressDialog() {
        if (mProgressDialog == null) {
            if (Build.VERSION_CODES.KITKAT < Build.VERSION.SDK_INT) {
//              R.style.ProgressDialogStyle은 커스텀으로 정의한 스타일임
                mProgressDialog = new ProgressDialog(getNowContext(), R.style.ProgressDialogStyle);
            } else {
                mProgressDialog = new ProgressDialog(getNowContext());
            }
            mProgressDialog.setMessage(getString(R.string.progress_message));
            mProgressDialog.setIndeterminate(true);
            mProgressDialog.setCancelable(false);
        }
        mProgressDialog.show();
    }

    /**
     * 프로그래스를 숨긴다.
     */
    public void hideProgressDialog() {
        if (mProgressDialog != null && mProgressDialog.isShowing()) {
            mProgressDialog.dismiss();
        }
    }
}

R.style.ProgressDialogStyle

<style name="ProgressDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
    <item name="android:layout_centerVertical">true</item>
    <item name="android:layout_centerHorizontal">true</item>
    <item name="colorAccent">@color/colorPrimary</item>
</style>

사용 할 때

private class DownloadTask extends AsyncTask{


    @Override
    protected void onPreExecute() {
        showProgressDialog(); // 작업 시작

        //작업 준비 코드 작성   
        super.onPreExecute();
    }


    @Override
    protected Object doInBackground(Object[] params) {
        //작업 중                                        
        return null;
    }

    @Override
    protected void onPostExecute(Object o) {
        //작업 끝 코드 작성                      

        hideProgressDialog(); // 작업 끝
        super.onPostExecute(o);
    }
}

 이런 느낌으로 사용하시면 됩니다.

많은 앱들이 카카오톡 처럼 탭 뷰페이저 형식을 사용합니다.

그래서 간단히 TabLayout + ViewPager + fragment 형식의 앱을 만들어서 공유드립니다.

다음과 같이 만들었는데요 

1. 라이브러리 셋팅

compile 'com.android.support:appcompat-v7:25.2.0'
compile 'com.android.support:support-v4:25.2.0'
compile 'com.android.support:recyclerview-v7:25.2.0'
compile 'com.android.support:design:25.2.0'

- AppCompatActivity클래스는 appcompatV7 라이브러리에 포함되어 있습니다.

- ViewPager클래스는 supportV4 라이브러리에 포함되어 있습니다.

- TabLayout은 design 라이브러리에 포함되어 있습니다.

2. 소스코드

MainActivity.java

import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import pe.sk.com.myapplication.R;
import pe.sk.com.myapplication.adapter.MainTabPagerAdapter;
import pe.sk.com.myapplication.data.DummyContent;
import pe.sk.com.myapplication.listener.OnListFragmentInteractionListener;

public class MainActivity extends AppCompatActivity implements OnListFragmentInteractionListener {
    private TabLayout mTabLayout = null;                // 탭 레이아웃
    private ViewPager mViewPager = null;                // 뷰 페이저
    private MainTabPagerAdapter mPagerAdapter = null;   // 탭 어댑터

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTabLayout = (TabLayout) findViewById(R.id.main_tab);
        mViewPager = (ViewPager) findViewById(R.id.main_viewpager);
        mTabLayout.setupWithViewPager(mViewPager);

        mPagerAdapter = new MainTabPagerAdapter(getSupportFragmentManager(), this);
        mViewPager.setAdapter(mPagerAdapter);
        mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(mTabLayout));
        mTabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                mViewPager.setCurrentItem(tab.getPosition());
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });
    }

    @Override
    public void onListFragmentInteraction(DummyContent.DummyItem item) {
        Toast.makeText(this,item.content,Toast.LENGTH_SHORT).show();
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.design.widget.TabLayout
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            android:id="@+id/main_tab"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:background="#ff880033"
            android:minHeight="?attr/actionBarSize"
            app:tabIndicatorColor="#bbdefa"
            app:tabSelectedTextColor="#ffffff"
            app:tabTextColor="#88ffffff"
            />


        <android.support.v4.view.ViewPager
            android:id="@+id/main_viewpager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@id/main_tab"
            />
    </RelativeLayout>
</android.support.v4.widget.DrawerLayout>

MainTabPagerAdapter.java

import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;

import pe.sk.com.myapplication.R;
import pe.sk.com.myapplication.fragment.FirstFragment;
import pe.sk.com.myapplication.fragment.TwoFragment;

/**
 * Created by P092613 on 2017-03-09.
 */

public class MainTabPagerAdapter extends FragmentStatePagerAdapter {
    private final static int TAB_COUNT = 2;     // 탭의 개수

    private Context mContext;
    private FirstFragment mFirstFragment = null;
    private TwoFragment mTwoFragment = null;

    private int[] mTabTitle = {R.string.first, R.string.two};

    public MainTabPagerAdapter(FragmentManager fm, Context context) {
        super(fm);
        this.mContext = context;
    }

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                mFirstFragment = FirstFragment.newInstance(1);
                return mFirstFragment;
            default:
                mTwoFragment = TwoFragment.newInstance(1);
                return mTwoFragment;
        }
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mContext.getString(mTabTitle[position]);
    }

    @Override
    public int getCount() {
        return TAB_COUNT;
    }
}

FirstFragment.java 와 TwoFragment.java 코드는 동일함

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import pe.sk.com.myapplication.R;
import pe.sk.com.myapplication.adapter.FirstRecyclerViewAdapter;
import pe.sk.com.myapplication.data.DummyContent;
import pe.sk.com.myapplication.listener.OnListFragmentInteractionListener;

/**
 * A fragment representing a list of Items.
 * <p/>
 * Activities containing this fragment MUST implement the {@link OnListFragmentInteractionListener}
 * interface.
 */
public class FirstFragment extends Fragment {

    // TODO: Customize parameter argument names
    private static final String ARG_COLUMN_COUNT = "column-count";
    // TODO: Customize parameters
    private int mColumnCount = 1;
    private OnListFragmentInteractionListener mListener;

    /**
     * Mandatory empty constructor for the fragment manager to instantiate the
     * fragment (e.g. upon screen orientation changes).
     */
    public FirstFragment() {
    }

    // TODO: Customize parameter initialization
    @SuppressWarnings("unused")
    public static FirstFragment newInstance(int columnCount) {
        FirstFragment fragment = new FirstFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_COLUMN_COUNT, columnCount);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (getArguments() != null) {
            mColumnCount = getArguments().getInt(ARG_COLUMN_COUNT);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_first_list, container, false);

        // Set the adapter
        if (view instanceof RecyclerView) {
            Context context = view.getContext();
            RecyclerView recyclerView = (RecyclerView) view;
            if (mColumnCount <= 1) {
                recyclerView.setLayoutManager(new LinearLayoutManager(context));
            } else {
                recyclerView.setLayoutManager(new GridLayoutManager(context, mColumnCount));
            }
            recyclerView.setAdapter(new FirstRecyclerViewAdapter(DummyContent.ITEMS, mListener));
        }
        return view;
    }


    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnListFragmentInteractionListener) {
            mListener = (OnListFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnListFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }


}

FirstRecyclerViewAdapter.java 와 TwoRecyclerViewAdapter.java 코드는 동일함

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.List;

import pe.sk.com.myapplication.R;
import pe.sk.com.myapplication.data.DummyContent.DummyItem;
import pe.sk.com.myapplication.listener.OnListFragmentInteractionListener;

/**
 * {@link RecyclerView.Adapter} that can display a {@link DummyItem} and makes a call to the
 * specified {@link OnListFragmentInteractionListener}.
 * TODO: Replace the implementation with code for your data type.
 */
public class FirstRecyclerViewAdapter extends RecyclerView.Adapter<FirstRecyclerViewAdapter.ViewHolder> {

    private final List<DummyItem> mValues;
    private final OnListFragmentInteractionListener mListener;

    public FirstRecyclerViewAdapter(List<DummyItem> items, OnListFragmentInteractionListener listener) {
        mValues = items;
        mListener = listener;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.fragment_first, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {
        holder.mItem = mValues.get(position);
        holder.mIdView.setText(mValues.get(position).id);
        holder.mContentView.setText(mValues.get(position).content);

        holder.mView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (null != mListener) {
                    // Notify the active callbacks interface (the activity, if the
                    // fragment is attached to one) that an item has been selected.
                    mListener.onListFragmentInteraction(holder.mItem);
                }
            }
        });
    }

    @Override
    public int getItemCount() {
        return mValues.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        public final View mView;
        public final TextView mIdView;
        public final TextView mContentView;
        public DummyItem mItem;

        public ViewHolder(View view) {
            super(view);
            mView = view;
            mIdView = (TextView) view.findViewById(R.id.id);
            mContentView = (TextView) view.findViewById(R.id.content);
        }

        @Override
        public String toString() {
            return super.toString() + " '" + mContentView.getText() + "'";
        }
    }
}

fragment_first_list.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/list"
    android:name="pe.sk.com.myapplication.fragment.FirstItemFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp"
    app:layoutManager="LinearLayoutManager"
    tools:context="pe.sk.com.myapplication.fragment.FirstFragment"
    tools:listitem="@layout/fragment_first"/>

fragment_first.xml

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

    <TextView
        android:id="@+id/id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/text_margin"
        android:textAppearance="?attr/textAppearanceListItem"/>

    <TextView
        android:id="@+id/content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/text_margin"
        android:textAppearance="?attr/textAppearanceListItem"/>
</LinearLayout>

끝

간혹 안드로이드 스튜디오를 실행해보면 다음과 같은 오류를 만날 수 있습니다.

Error:Unable to start the daemon process.

This problem might be caused by incorrect configuration of the daemon.

For example, an unrecognized jvm option is used.

Please refer to the user guide chapter on the daemon at https://docs.gradle.org/2.14.1/userguide/gradle_daemon.html

Please read the following process output to find out more:

-----------------------

Error occurred during initialization of VM

Could not reserve enough space for 1572864KB object heap

이럴 경우 당황하지 말고 

gradle.properties 파일로 들어가서 Xmx1536m -> Xmx512m 으로 변경해준다.

저장 후 상단 오른쪽에 Try again을 눌러주면 끝

개발을 하다보면 이러한 오류를 만날 수 있습니다.

이럴때는 당황하지 말고

Poject의 build.gradle에 compile 'com.android.support:design:25.2.0' lib를 추가하시면 해결 됩니다.