Android

안드로이드 5기 2017년 강의 정리 1 (오준석의 생존코딩)

1일차

2일차 RelativeLayout

3일차 커피앱 코딩

5일차 액티비티끼리 데이터 주고 받기

6일차 암시적 인텐트와 인텐트 필터

7일차 옵션 메뉴

8일차 WebView

9일차 ArrayAdapter, SimpleAdapter

10일차 BaseAdapter

1. 1일차

textSize 는 sp 를 써라 (시스템에서 textSize 변경시 같이 변경됨)

길이는 dp 를 써라.

ImageView 의 scaleType 은 centerCrop 권장

리소스 파일 이름은 숫자로 시작하면 안되고 소문자로만 구성해야한다.

drawable 폴더는 메모리를 더 사용하므로 drawable-hdpi 폴더를 만들어서 사용하라.

# LinearLayout 에서 가중치(weight) 주기

가중치를 줄 속성에 0dp 에 준다.
LinearLayout 에 android:weightSum=”5″ 를 주면 5/5 가중치를 만듦

layout_height=”0dp”
layout_weight=”1″ // 1번 view (1/5)

layout_height=”0dp”
layout_weight=”1″ // 2번 view (1/5)

layout_height=”0dp”
layout_weight=”3″ // 3번 view (3/5)

2. 2일차

RelativeLayout

글을 오른쪽부터 쓰는 나라를 위해서 Left, Right 가 아니라 Start, End 를 써라.

layout_toLeftOf
layout_above
layout_toRightOf
layout_below
layout_toStartOf
layout_toEndOf

layout_alignParentLeft
layout_alignParentTop
layout_alignParentRight
layout_alignParentBottom
layout_centerHorizontal
layout_centerVertical
layout_centerInParent
layout_alignParentStart
layout_alignParentEnd

layout_alignLeft
layout_alignTop
layout_alignRight
layout_alignBottom
layout_alignBaseline

RelativeLayout (개발자를 위한 레시피)
https://recipes4dev.tistory.com/126

3. 3일차 커피앱 코딩

Live Templates

File – Settings – Editor – Live Templates

ld : Log.d(TAG, “$cursor”); // statement, Reformat according to style

public static final String TAG = MainActivity.class.getSimpleName();

Andorid Logcat 색상 지정

File – Settings – Editor – Color Scheme – Android Logcat

4. 5일차 액티비티끼리 데이터 주고 받기

https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/OrderCheckActivity.java

# 암시적 인텐트를 검색하려면 common intents 를 검색하라.

https://developer.android.com/guide/components/intents-common#java

# 암시적 인텐트를 사용해서 이메일 보내기

public void composeEmail(String[] addresses, String subject) {
    Intent intent = new Intent(Intent.ACTION_SENDTO);
    intent.setData(Uri.parse("mailto:")); // only email apps should handle this
    intent.putExtra(Intent.EXTRA_EMAIL, addresses);
    intent.putExtra(Intent.EXTRA_SUBJECT, subject);
    if (intent.resolveActivity(getPackageManager()) != null) {
        startActivity(intent);
    }
}

# 암시적 인텐트를 사용해서 전화 걸기

<uses-permission android:name=”android.permission.CALL_PHONE” />

public void dialPhoneNumber(String phoneNumber) {
    Intent intent = new Intent(Intent.ACTION_DIAL);
    intent.setData(Uri.parse("tel:" + phoneNumber));
    if (intent.resolveActivity(getPackageManager()) != null) {
        startActivity(intent);
    }
}

4. 안드로이드5일차 액티비티끼리 데이터 주고 받기 2

https://developer.android.com/training/basics/intents/result#java

# StartActivityForResultActivity.java
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/StartActivityForResultActivity.java

# TargetActivity.java
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/TargetActivity.java

4가지 컴포넌트는 AndoridManifest.xml 에 선언되어야 사용할 수 있다.

# 보내는 액티비티

    @Override
    public void onClick(View v) {
        Intent intent = new Intent(this, TargetActivity.class);
        intent.putExtra("value", mValueEditText.getText().toString());
        //  startActivity(intent);
        // 주거니 받거니
        startActivityForResult(intent, REQUEST_CODE_EXAMPLE);
    }

    // 받을 때 호출 되는 콜백 메서드
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == REQUEST_CODE_EXAMPLE && resultCode == RESULT_OK && data != null) {
            Log.d(TAG, "onActivityResult: " + requestCode);
            Log.d(TAG, "onActivityResult: " + resultCode);
            Log.d(TAG, "onActivityResult: " + data);
            String result = data.getStringExtra("result");
            int value = data.getIntExtra("int", -1);
            Toast.makeText(this, result + ", int: " + value, Toast.LENGTH_SHORT).show();
        } else if (requestCode == REQUEST_CODE_NEW_MEMO) {

        } else if (requestCode == REQUEST_CODE_UPDATE_MEMO) {

        }
    }

# 받는 액티비티

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_target);

    if (getIntent() != null) {
        String value = getIntent().getStringExtra("value");
        mValueTextView.setText(value);
    }
}

@Override
public void onClick(View v) {
    // 결과 전달
    Intent intent = new Intent();
    intent.putExtra("result", "이것은 내가 지정한 문구다");
    intent.putExtra("int", 50);

    setResult(RESULT_OK, intent);
    finish();
}

4. 안드로이드5일차 연습문제 풀이

# IntentExamActivity.java
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/IntentExamActivity.java

# IntentExamActivity2.java
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/IntentExam2Activity.java

public class IntentExamActivity extends AppCompatActivity implements View.OnClickListener {

    public static final int REQUEST_CODE = 1000;
    private EditText mIdEditText;
    private EditText mPasswordEditText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_intent_exam);

        mIdEditText = (EditText) findViewById(R.id.id_edit);
        mPasswordEditText = (EditText) findViewById(R.id.password_edit);

        findViewById(R.id.login_button).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        Intent intent = new Intent(this, IntentExam2Activity.class);
        intent.putExtra("id", mIdEditText.getText().toString());
        intent.putExtra("password", mPasswordEditText.getText().toString());

        startActivityForResult(intent, REQUEST_CODE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == REQUEST_CODE
                && resultCode == RESULT_OK
                && data != null) {
            String text = data.getStringExtra("result");
            Toast.makeText(this, text, Toast.LENGTH_SHORT).show();
        }
    }
}

public class IntentExam2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_intent_exam2);

        if (getIntent() != null) {
            String id = getIntent().getStringExtra("id");
            String password = getIntent().getStringExtra("password");

            Toast.makeText(this, "id = " + id + ", pw = " + password, Toast.LENGTH_SHORT).show();
        }
    }

    public void onClick(View view) {
        String text = ((Button) view).getText().toString();

        Intent intent = new Intent();
        intent.putExtra("result", text);

        setResult(RESULT_OK, intent);
        finish();
    }
}

5. 6일차 암시적 인텐트와 인텐트 필터

# 공통 인텐트

https://developer.android.com/guide/components/intents-common#java

# ImplicitActivity.java

https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/ImplicitActivity.java

ActionBar 는 오래전에 나와서 클릭도 안되고 활용성이 없어서 사용을 안한다.
이 후에 활용성이 좋은 Toolbar 가 나왔다.

public class ImplicitActivity extends AppCompatActivity implements View.OnClickListener {

    private EditText mPhoneEditText;
    private EditText mUrlEditText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_implicit);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });


        mPhoneEditText = (EditText) findViewById(R.id.phone_edit);
        mUrlEditText = (EditText) findViewById(R.id.url_edit);

        findViewById(R.id.phone_button).setOnClickListener(this);
        findViewById(R.id.url_button).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.phone_button:
                String phoneNumber = mPhoneEditText.getText().toString();
                dialPhone(phoneNumber);
                break;
            case R.id.url_button:
                String url = mUrlEditText.getText().toString();
                showUrl(url);
                break;
        }
    }

    private void showUrl(String url) {
        if (!url.startsWith("http://")) {
            url = "http://" + url;
        }
        Uri webpage = Uri.parse(url);
        Intent intent = new Intent(Intent.ACTION_VIEW, webpage);
        if (intent.resolveActivity(getPackageManager()) != null) {
            startActivity(intent);
        }
    }

    private void dialPhone(String phoneNumber) {
        Intent intent = new Intent(Intent.ACTION_DIAL);
        intent.setData(Uri.parse("tel:" + phoneNumber));
        if (intent.resolveActivity(getPackageManager()) != null) {
            startActivity(intent);
        } else {
            Toast.makeText(this, "수행할 앱이 없어요", Toast.LENGTH_SHORT).show();
        }
    }
}

5. 6일차 로그인 연습문제 풀이

# SignUpExamActivity.java

https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/SignUpExamActivity.java

# SignUpExamTargetActivity.java

https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/SignUpExamTargetActivity.java

public class SignUpExamActivity extends AppCompatActivity implements View.OnClickListener {

    public static final int REQUEST_CODE_SIGN_UP = 1000;
    private EditText mIdEditText;
    private EditText mPassEditText;
    private EditText mPass2EditText;
    private EditText mEmailEditText;
    private RadioGroup mGenderGroup;

    private ArrayList<EditText> mEditTextList;
    private String mGenger;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sign_up_exam);

        mEditTextList = new ArrayList<>();

        mIdEditText = (EditText) findViewById(R.id.id_edit);
        mPassEditText = (EditText) findViewById(R.id.pass_edit);
        mPass2EditText = (EditText) findViewById(R.id.pass2_edit);
        mEmailEditText = (EditText) findViewById(R.id.email_edit);

        mEditTextList.add(mIdEditText);
        mEditTextList.add(mPassEditText);
        mEditTextList.add(mPass2EditText);
        mEditTextList.add(mEmailEditText);

        mGenderGroup = (RadioGroup) findViewById(R.id.gender_group);
        mGenderGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                mGenger = ((RadioButton)findViewById(checkedId)).getText().toString();
            }
        });

        findViewById(R.id.reset_button).setOnClickListener(this);
        findViewById(R.id.sign_up_button).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.reset_button:
                reset();
                break;
            case R.id.sign_up_button:
                signUp();
                break;
        }
    }


    private boolean isValid() {
        for (EditText editText : mEditTextList) {
            if (TextUtils.isEmpty(editText.getText().toString())) {
                return false;
            }
        }

        if (mGenderGroup.getCheckedRadioButtonId() == -1) {
            return false;
        }

        return true;
    }

    private void signUp() {
        if (!isValid()) {
            Toast.makeText(this, "모두 입력 해 주셔야 합니다", Toast.LENGTH_SHORT).show();
        } else if (!isValidPassword()) {
            Toast.makeText(this, "비밀번호가 다릅니다", Toast.LENGTH_SHORT).show();
        } else {
            // 가입
            Intent intent = new Intent(this, SignUpExamTargetActivity.class);
            intent.putExtra("id", mIdEditText.getText().toString());
            intent.putExtra("pass", mPassEditText.getText().toString());
            intent.putExtra("email", mEmailEditText.getText().toString());
            intent.putExtra("gender", mGenger);

            startActivityForResult(intent, REQUEST_CODE_SIGN_UP);
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == REQUEST_CODE_SIGN_UP &&
                resultCode == RESULT_OK) {
            Toast.makeText(this, "확인 버튼을 누르셨습니다", Toast.LENGTH_SHORT).show();
        }
    }

    private boolean isValidPassword() {
        return mPassEditText.getText().toString().equals(mPass2EditText.getText().toString());
    }

    private void reset() {
        for (EditText editText : mEditTextList) {
            editText.setText("");
        }

        mGenderGroup.clearCheck();
    }
}

public class SignUpExamTargetActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sign_up_exam_target);

        if (getIntent() != null) {
            String id = getIntent().getStringExtra("id");
            String pass = getIntent().getStringExtra("pass");
            String email = getIntent().getStringExtra("email");
            String gender = getIntent().getStringExtra("gender");

            String result = String.format("아이디 : %s\n비밀번호 : %s\n이메일 : %s     성별 : %s",
                    id,
                    pass,
                    email,
                    gender);

            TextView resultTextView = (TextView) findViewById(R.id.result_text);
            resultTextView.setText(result);
        }

        findViewById(R.id.ok_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setResult(RESULT_OK);
                finish();
            }
        });
    }
}

6. 7일차 옵션 메뉴

https://developer.android.com/guide/topics/ui/menus#java

https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/MainActivity.java

https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/res/menu/menu_main.xml

# menu/menu_main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_setting"
        android:icon="@mipmap/ic_launcher"
        android:title="설정"
        app:showAsAction="always" />
    <item
        android:id="@+id/action_menu2"
        android:title="Item2" />
    <item
        android:id="@+id/action_menu3"
        android:title="Item3" />
</menu>

# MainActivity.java

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.action_setting:
            Toast.makeText(this, "설정 아직 미구현", Toast.LENGTH_SHORT).show();
            return true;
        case R.id.action_menu2:
            sound();
            return true;
        case R.id.action_menu3:
            startChronometer();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

private Chronometer mChronometer;

...
// onCreate() 안에 작성..
mChronometer = (Chronometer) findViewById(R.id.timer);
mChronometer.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener() {
    @Override
    public void onChronometerTick(Chronometer chronometer) {
        Log.d(TAG, "onChronometerTick: " + chronometer.getText().toString());
        sound();
    }
});

private void startChronometer() {
    mChronometer.setBase(SystemClock.elapsedRealtime());
    mChronometer.start();
}

private void sound() {
    MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.monkey);
    mediaPlayer.start();
}

7. 8일차 WebView

# WebBrowserActivity.java
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/WebBrowserActivity.java

# activity_web_browser.xml
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/res/layout/activity_web_browser.xml

public class WebBrowserActivity extends AppCompatActivity {

    private EditText mUrlEditText;
    private WebView mWebView;

    private Button mSearchButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_web_browser);

        mUrlEditText = (EditText) findViewById(R.id.url_edit);
        mWebView = (WebView) findViewById(R.id.web_view);

        WebSettings webSettings = mWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);

        // 일반적
//        mWebView.setWebViewClient(new WebViewClient());

        // 기능 확장
        mWebView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);

                Toast.makeText(WebBrowserActivity.this, "로딩 완료", Toast.LENGTH_SHORT).show();
            }
        });

        mSearchButton = (Button) findViewById(R.id.search_btn);
        mSearchButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mWebView.loadUrl(mUrlEditText.getText().toString());
            }
        });

        // 키보드 이벤트 검출
        mUrlEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if (actionId == EditorInfo.IME_ACTION_SEARCH) {
                    // 버튼을 코드로 누르기
                    mSearchButton.callOnClick();

                    // 키보드 내리기
                    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                    imm.hideSoftInputFromWindow(mUrlEditText.getWindowToken(), 0);
                }
                return true;
            }
        });

    }

    // 뒤로 가기 키 캐치
    @Override
    public void onBackPressed() {
        if (mWebView.canGoBack()) {
            mWebView.goBack();
        } else {
            super.onBackPressed();
        }
    }
}

– 9일차 ArrayAdapter, SimpleAdapter

# ListViewActivity.java
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/ListViewActivity.java

# activity_list_view.xml
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/res/layout/activity_list_view.xml

# ArrayAdapter, SimpleAdapter (구글 검색)

# ArrayAdapter

ArrayList<String> mDataList = new ArrayList<>();

for (int i = 0; i < 50; i++) {
    mDataList.add("item " + i);
}

ArrayAdapter<String> adapter =
        new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mDataList);

ListView listView = findViewById(R.id.listview);
listView.setAdapter(adapter);

listView.setOnItemClickListener((parent, view, position, id) -> {
    String selected_item = (String)parent.getItemAtPosition(position);

    mDataList.remove(selected_item);

    adapter.notifyDataSetChanged();
});

# SimpleAdapter

ListView listView = findViewById(R.id.listview);
ArrayList<HashMap<String, String>> dataList =  new ArrayList<>();

HashMap<String, String> mapData = new HashMap<>();
mapData.put("name", "홍길동");
mapData.put("city", "광주광역시");
dataList.add(mapData);

mapData = new HashMap<String, String>();
mapData.put("name", "임꺽정");
mapData.put("city", "서울특별시");
dataList.add(mapData);

mapData = new HashMap<String, String>();
mapData.put("name", "김두한");
mapData.put("city", "대전광역시");
dataList.add(mapData);

SimpleAdapter adapter = new SimpleAdapter(this, dataList,
                android.R.layout.simple_list_item_2,
                new String[] {"name", "city"},
                new int[] {android.R.id.text1, android.R.id.text2});
listView.setAdapter(adapter);

# ArrayList, ArrayAdapter와 ListView – 1. 기본적인 사용 방법
https://webnautes.tistory.com/1190

# Using an ArrayAdapter with ListView
https://guides.codepath.com/android/Using-an-ArrayAdapter-with-ListView

# [Android] ListView와 SimpleAdapter
https://m.blog.naver.com/draming/20158837275

# Custom SimpleAdapter Tutorial With Example In Android Studio
https://abhiandroid.com/ui/custom-simpleadapter.html

8. 10일차 BaseAdapter

# WeatherActivity.java
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/activities/WeatherActivity.java

# adapters/WeatherAdapter.java
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/adapters/WeatherAdapter.java

# models/Weather.java
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/java/com/example/myapplication/models/Weather.java

# item_weather.xml
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/res/layout/item_weather.xml

# activity_weather.xml
https://github.com/suwonsmartapp/MyFirstAndroidApp5ki/blob/master/app/src/main/res/layout/activity_weather.xml

# 사진 파일은 drawable-hdpi 폴더에 넣어라. drawable 폴더에 넣으면 메모리를 더 많이 차지한다.

# 뷰홀더 사용 이유
listview 는 뷰를 재사용한다.
뷰를 재사용할 때마다 findViewById 를 하게되면 효율성이 떨어지므로 뷰홀더를 사용한다.

# AdapterView 는 ListView, GridView, Spinner 세 개를 주로 사용한다.

# item_weather.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="8dp">

    <ImageView
        android:id="@+id/weather_image"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:scaleType="centerCrop"
        android:src="@mipmap/ic_launcher" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/location_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="지역"
            android:textSize="36sp" />

        <TextView
            android:id="@+id/temperature_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end"
            android:text="기온"
            android:textSize="24sp" />
    </LinearLayout>

</LinearLayout>

# activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_weather"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <GridView
        android:id="@+id/grid_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:numColumns="3" />

</LinearLayout>

# models/Weather.java

public class Weather {
    private int imageRes;
    private String weather;
    private String country;
    private String temperature;

    public Weather(int imageRes, String country, String temperature) {
        this.imageRes = imageRes;
        this.country = country;
        this.temperature = temperature;
    }

    public int getImageRes() {
        return imageRes;
    }

    public void setImageRes(int imageRes) {
        this.imageRes = imageRes;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getTemperature() {
        return temperature;
    }

    public void setTemperature(String temperature) {
        this.temperature = temperature;
    }

    public String getWeather() {
        return weather;
    }

    public void setWeather(String weather) {
        this.weather = weather;
    }

    @Override
    public String toString() {
        final StringBuffer sb = new StringBuffer("Weather{");
        sb.append("country='").append(country).append('\'');
        sb.append(", imageRes=").append(imageRes);
        sb.append(", weather='").append(weather).append('\'');
        sb.append(", temperature='").append(temperature).append('\'');
        sb.append('}');
        return sb.toString();
    }
}

# adapters/WeatherAdapter.java

public class WeatherAdapter extends BaseAdapter {
    private static final String TAG = WeatherAdapter.class.getSimpleName();
    private Context mContext;
    private List<Weather> mData;

    public WeatherAdapter(Context context, List<Weather> data) {
        mContext = context;
        mData = data;
    }

    // 아이템 갯수
    @Override
    public int getCount() {
        return mData.size();
    }

    // position번째 아이템
    @Override
    public Object getItem(int position) {
        return mData.get(position);
    }

    // postion번째 id
    @Override
    public long getItemId(int position) {
        return position;
    }

    // position번째의 레이아웃
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        // convertView : 재사용 되는 뷰
        if (convertView == null) {
            viewHolder = new ViewHolder();

            // 뷰를 새로 만들 때
            convertView = LayoutInflater.from(mContext)
                    .inflate(R.layout.item_weather, parent, false);

            // 레이아웃 들고 오기
            ImageView imageView = convertView.findViewById(R.id.weather_image);
            TextView locationTextView = convertView.findViewById(R.id.location_text);
            TextView temperatureTextView = convertView.findViewById(R.id.temperature_text);

            // 뷰 홀더에 넣는다
            viewHolder.weatherImage = imageView;
            viewHolder.locationTextView = locationTextView;
            viewHolder.temperatureTextView = temperatureTextView;

            convertView.setTag(viewHolder);
        } else {
            // 재사용 할 때
            viewHolder = (ViewHolder) convertView.getTag();
        }

        Log.d(TAG, "getView: " + position);

        // 데이터
        Weather weather = mData.get(position);

        // 화면에 뿌리기
        viewHolder.weatherImage.setImageResource(weather.getImageRes());
        viewHolder.locationTextView.setText(weather.getCountry());
        viewHolder.temperatureTextView.setText(weather.getTemperature());

        // 홀수 줄은 빨간 색
        if (position % 2 == 1) {
            convertView.setBackgroundColor(Color.RED);
        } else {
            convertView.setBackgroundColor(Color.WHITE);
        }

        // 클릭 된 아이템이면 노란색
        if (mSeletedPosition == position) {
            convertView.setBackgroundColor(Color.YELLOW);
        }

        return convertView;
    }

    // -1이면 선택된게 없다
    private int mSeletedPosition = -1;

    public void setSelect(int position) {
        mSeletedPosition = position;
    }

    // findViewById로 가져온 View 들을 보관
    private static class ViewHolder {
        ImageView weatherImage;
        TextView locationTextView;
        TextView temperatureTextView;
    }
}