'분류 전체보기'에 해당되는 글 256건

HttpURLConnection 사용법

android 2020. 2. 4. 18:29

* MainActivity.java

public class MainActivity extends AppCompatActivity {

    EditText editText;
    TextView textView;

    Handler handler = new Handler();

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

        editText = findViewById(R.id.editText);
        textView = findViewById(R.id.textView);

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final String urlStr = editText.getText().toString();

                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        request(urlStr);
                    }
                }).start();
            }
        });
    }

    public void request(String urlStr) {
        try {
            StringBuilder builder = new StringBuilder();

            URL url = new URL(urlStr);

            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            if (conn != null) {
                conn.setConnectTimeout(10000);
                conn.setRequestMethod("GET");
                conn.setDoInput(true);

                int resCode = conn.getResponseCode();

                BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                String line = null;
                while (true) {
                    line = reader.readLine();
                    if (line == null) {
                        break;
                    }

                    builder.append(line + "\n");
                }

                reader.close();
                conn.disconnect();
            }

            println("응답 : " + builder.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void println(final String data) {
        handler.post(new Runnable() {
            @Override
            public void run() {
                textView.append(data + "\n");
            }
        });
    }

}

* activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="http://www.google.com" />

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

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

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

            <TextView
                android:id="@+id/textView"
                android:textSize="20dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>

    </ScrollView>

</LinearLayout>

* AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<application android:usesCleartextTraffic="true" />

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“말은 쉽지, 코드를 보여줘.” “Talk is cheap. Show me the code.” – 리누스 토르발스(Linus Torvalds)

,

Socket 통신(Thread 필수)

android 2020. 2. 4. 16:44

* MainActivity.java

public class MainActivity extends AppCompatActivity {

    EditText input1;
    TextView output1;

    int port = 5001;

    Handler handler = new Handler();

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

        input1 = findViewById(R.id.input1);
        output1 = findViewById(R.id.output1);

        Button sendButton = findViewById(R.id.sendButton);
        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final String data = input1.getText().toString();

                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        send(data); // data 변수 접근을 위해 final 선언
                    }
                }).start();
            }
        });

        Button startServerButton = findViewById(R.id.startServerButton);
        startServerButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        startServer();
                    }
                }).start();
            }
        });
    }

    public void startServer() {
        try {
            ServerSocket server = new ServerSocket(port);

            while (true) {
                Socket socket = server.accept();
                InetAddress clientHost = socket.getInetAddress();
                int clientPort = socket.getPort();
                println("클라이언트 연결됨 : " + clientHost + ", " + clientPort);

                ObjectInputStream inputStream = new ObjectInputStream(socket.getInputStream());
                String input = (String) inputStream.readObject();
                println("데이터 받음 : " + input);

                ObjectOutputStream outputStream = new ObjectOutputStream(socket.getOutputStream());
                outputStream.writeObject(input + " from server.");
                outputStream.flush();
                println("데이터 보냄");

                socket.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void println(final String data) {
        handler.post(new Runnable() {
            @Override
            public void run() {
                output1.append(data + "\n");
            }
        });
    }

    public void send(String data) {
        try {
            Socket socket = new Socket("localhost", port);

            ObjectOutputStream outputStream = new ObjectOutputStream(socket.getOutputStream());
            outputStream.writeObject(data);
            outputStream.flush();

            ObjectInputStream inputStream = new ObjectInputStream(socket.getInputStream());
            String input = (String) inputStream.readObject();
            socket.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

* activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="#80D8FF"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView"
            android:textSize="30sp"
            android:layout_marginBottom="30dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="클라이언트" />

        <EditText
            android:id="@+id/input1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:inputType="textPersonName" />

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

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="#FFFF8D"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView2"
            android:textSize="30sp"
            android:layout_marginBottom="30dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="서버" />

        <Button
            android:id="@+id/startServerButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="서버 시작" />

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

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

                <TextView
                    android:id="@+id/output1"
                    android:textSize="20sp"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" />
            </LinearLayout>
            
        </ScrollView>

    </LinearLayout>

</LinearLayout>

* AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />

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디츠

“말은 쉽지, 코드를 보여줘.” “Talk is cheap. Show me the code.” – 리누스 토르발스(Linus Torvalds)

,

AsyncTask 사용법

android 2020. 2. 4. 14:59

* MainActivity.java

public class MainActivity extends AppCompatActivity {

    ProgressBar progressBar;

    int value;

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

        progressBar = findViewById(R.id.progressBar);

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                BackgroundTask task = new BackgroundTask();
                task.execute();
            }
        });
    }

    class BackgroundTask extends AsyncTask<Integer, Integer, Integer> {

        @Override
        protected void onPreExecute() {
            value = 0;
            progressBar.setProgress(value);
        }

        @Override
        protected void onPostExecute(Integer integer) {
            progressBar.setProgress(0);
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            progressBar.setProgress(values[0].intValue());
        }

        @Override
        protected Integer doInBackground(Integer... integers) {
            while (isCancelled() == false) {
                value++;

                if (value >= 100) {
                    break;
                }

                publishProgress(value);

                try {
                    Thread.sleep(1000);
                } catch (Exception e) {
                    //
                }
            }

            return value;
        }

    }

}

* activity_main.xml

public class MainActivity extends AppCompatActivity {

    ProgressBar progressBar;

    int value;

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

        progressBar = findViewById(R.id.progressBar);

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                BackgroundTask task = new BackgroundTask();
                task.execute();
            }
        });
    }

    class BackgroundTask extends AsyncTask<Integer, Integer, Integer> {

        @Override
        protected void onPreExecute() {
            value = 0;
            progressBar.setProgress(value);
        }

        @Override
        protected void onPostExecute(Integer integer) {
            progressBar.setProgress(0);
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            progressBar.setProgress(values[0].intValue());
        }

        @Override
        protected Integer doInBackground(Integer... integers) {
            while (isCancelled() == false) {
                value++;

                if (value >= 100) {
                    break;
                }

                publishProgress(value);

                try {
                    Thread.sleep(1000);
                } catch (Exception e) {
                    //
                }
            }

            return value;
        }

    }

}

 

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블로그 이미지

디츠

“말은 쉽지, 코드를 보여줘.” “Talk is cheap. Show me the code.” – 리누스 토르발스(Linus Torvalds)

,

Thread 사용법

android 2020. 2. 4. 01:17

* MainActivity.java

public class MainActivity extends AppCompatActivity {

    TextView textView;
    Handler handler = new Handler();

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

        textView = findViewById(R.id.textView);

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                BackgroundThread thread = new BackgroundThread();
                thread.start();
            }
        });
    }

    class BackgroundThread extends Thread {
        int value = 0;

        public void run() {
            for (int i = 0; i < 100; i++) {
                try {
                    Thread.sleep(1000);
                } catch (Exception e) {
                    //
                }

                value++;
                Log.d("MyThread", "value : " + value);

                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        textView.setText("값 : " + value);

                    }
                });

                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        textView.setText("값 : " + value);
                    }
                }, 5000);
            }
        }
    }

}

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디츠

“말은 쉽지, 코드를 보여줘.” “Talk is cheap. Show me the code.” – 리누스 토르발스(Linus Torvalds)

,

키패드 닫기

android 2020. 2. 3. 23:41

* MainActivity.java

public class MainActivity extends AppCompatActivity {

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

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                InputMethodManager manager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                manager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
            }
        });
    }

}

* activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="키패드 닫기"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.083" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPersonName"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button"
        app:layout_constraintVertical_bias="0.173" />
    
</androidx.constraintlayout.widget.ConstraintLayout>

* AndroidManifest.xml

<activity android:windowSoftInputMode="stateHidden">

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디츠

“말은 쉽지, 코드를 보여줘.” “Talk is cheap. Show me the code.” – 리누스 토르발스(Linus Torvalds)

,

SeekBar 사용법

android 2020. 2. 3. 23:30

* MainActivity.java

public class MainActivity extends AppCompatActivity {

    TextView textView;

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

        textView = findViewById(R.id.textView);

        SeekBar seekBar = findViewById(R.id.seekBar);
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                textView.setText("지정된 값 : " + progress);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });

    }

}

* activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/textView"
        android:layout_marginTop="50dp"
        android:textSize="30sp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="지정한 값" />

</LinearLayout>

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“말은 쉽지, 코드를 보여줘.” “Talk is cheap. Show me the code.” – 리누스 토르발스(Linus Torvalds)

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