'분류 전체보기'에 해당되는 글 256건

ProgressDialog

android 2020. 2. 10. 16:11 
ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("로딩중!");
progressDialog.show();

progressDialog.dismiss(); // 창닫기

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

,

연락처 가져오기

android 2020. 2. 5. 13:40

* MainActivity.java

public class MainActivity extends AppCompatActivity implements AutoPermissionsListener {

    TextView textView;

    @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) {
                selectContacts();
            }
        });

        AutoPermissions.Companion.loadAllPermissions(this, 101);
    }

    public void selectContacts() {
        Intent intent = new Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI);
        startActivityForResult(intent, 101);
    }

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

        if (requestCode == 101) {
            if (resultCode == RESULT_OK) {
                Uri contactsUri = data.getData();
                String id = contactsUri.getLastPathSegment();

                getContacts(id);
            }
        }
    }

    public void getContacts(String id) {
        Cursor cursor = null;
        String name = "";

        try {
            cursor = getContentResolver().query(ContactsContract.Data.CONTENT_URI,
                    null,
                    ContactsContract.Data.CONTACT_ID + "=?",
                    new String[] {id},
                    null);
            if (cursor.moveToFirst()) {
                name = cursor.getString(cursor.getColumnIndex(ContactsContract.Data.DISPLAY_NAME));
                println("Name : " + name);

                String columns[] = cursor.getColumnNames();
                for (String column : columns) {
                    int index = cursor.getColumnIndex(column);
                    String columnOutput = "#" + index + " -> [" + column + "] " + cursor.getString(index);
                    println(columnOutput);
                }

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

    public void println(String data) {
        textView.append(data + "\n");
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        AutoPermissions.Companion.parsePermissions(this, requestCode, permissions, this);
    }

    @Override
    public void onDenied(int requestCode, String[] permissions) {
        Toast.makeText(this, "permissions denied : " + permissions.length, Toast.LENGTH_LONG).show();
    }

    @Override
    public void onGranted(int requestCode, String[] permissions) {
        Toast.makeText(this, "permissions granted : " + permissions.length, Toast.LENGTH_LONG).show();
    }
}

* 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" >

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

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#FFE57F">

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

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

* AndroidManifest.xml

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

* Gradle

allprojects {
    repositories {
        maven { url 'https://jitpack.io' }
    }
}

dependencies {
    implementation 'com.github.pedroSG94:AutoPermissions:1.0.3'
}

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

,

갤러리 이미지 가져오기

android 2020. 2. 5. 13:10

* MainActivity.java

public class MainActivity extends AppCompatActivity implements AutoPermissionsListener {

    ImageView imageView;

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

        imageView = findViewById(R.id.imageView);

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

        AutoPermissions.Companion.loadAllPermissions(this, 101);
    }

    public void openGallery() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);

        startActivityForResult(intent, 101);
    }

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

        if (requestCode == 101) {
            if (resultCode == RESULT_OK) {
                Uri fileUri = data.getData();

                ContentResolver resolver = getContentResolver();

                try {
                    InputStream inputStream = resolver.openInputStream(fileUri);
                    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);

                    imageView.setImageBitmap(bitmap);

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

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        AutoPermissions.Companion.parsePermissions(this, requestCode, permissions, this);
    }

    @Override
    public void onDenied(int requestCode, String[] permissions) {
        Toast.makeText(this, "permissions denied : " + permissions.length, Toast.LENGTH_LONG).show();
    }

    @Override
    public void onGranted(int requestCode, String[] permissions) {
        Toast.makeText(this, "permissions granted : " + permissions.length, Toast.LENGTH_LONG).show();
    }

}

* 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" >

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

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:srcCompat="@mipmap/ic_launcher" />

</LinearLayout>

* AndroidManifest.xml

<!-- 외장 SD 카드 권한 -->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

* Gradle

allprojects {
    repositories {
        maven { url 'https://jitpack.io' }
    }
}

dependencies {
    implementation 'com.github.pedroSG94:AutoPermissions:1.0.3'
}

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블로그 이미지

디츠

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

,

SQLite 사용법

android 2020. 2. 5. 11:35

* MainActivity.java

public class MainActivity extends AppCompatActivity {

    EditText editText;
    EditText editText2;
    TextView textView;

    SQLiteDatabase database;

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

        editText = findViewById(R.id.editText);
        editText2 = findViewById(R.id.editText2);
        textView = findViewById(R.id.textView);

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

        Button button2 = findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String tableName = editText2.getText().toString();
                createTable(tableName);
            }
        });

        Button button3 = findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                insertRecord();
            }
        });

        Button button4 = findViewById(R.id.button4);
        button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                excuteQuery();
            }
        });
    }

    public void createDatabase(String databaseName) {
        println("createDatabase 호출됨");

        try {
            database = openOrCreateDatabase(databaseName + ".db", MODE_PRIVATE, null);
            println("데이터베이스 생성됨 : " + databaseName);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void createTable(String tableName) {
        println("createTable 호출됨");

        try {
            if (database == null) {
                println("데이터베이스를 먼저 열어주세요.");
                return;
            }

            String sql = "create table if not exists " + tableName + "(_id integer PRIMARY KEY autoincrement, name text, age integer, mobile text)";
            database.execSQL(sql);
            println("테이블 생성됨 : " + tableName);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void insertRecord() {
        println("insertRecord 호출됨");

        try {
            if (database == null) {
                println("데이터베이스를 먼저 열어주세요.");
                return;
            }

            String tableName = editText2.getText().toString();
            if (tableName == null) {
                println("테이블 이름을 입력하세요.");
                return;
            }

            String sql = "insert into " + tableName + "(name, age, mobile) values ('홍길동', '20', '010-1000-1000')";
            database.execSQL(sql);
            println("레코드 추가함");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void excuteQuery() {
        println("excuteQuery 호출됨");

        if (database == null) {
            println("테이터베이스를 먼저 열어주세요.");
        }

        String tableName = editText2.getText().toString();
        if (tableName == null) {
            println("테이블 이름을 입력하세요.");
        }

        try {
            String sql = "select _id, name, age, mobile from " + tableName;
            Cursor cursor = database.rawQuery(sql, null);

            int i = 1;
            while (cursor.moveToNext()) {


                int id = cursor.getInt(0);
                String name = cursor.getString(1);
                int age = cursor.getInt(2);
                String mobile = cursor.getString(3);

                println("레코드 #" + i + " : " + id + ", " + name + ", " + age + ", " + mobile);
                i++;
            }

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

    public void println(String data) {
        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">

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

        <EditText
            android:id="@+id/editText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName" />

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="데이터베이스 만들기" />
    </LinearLayout>

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

        <EditText
            android:id="@+id/editText2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="테이블 만들기" />
    </LinearLayout>

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

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="레코드 추가" />
    </LinearLayout>

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

        <Button
            android:id="@+id/button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="레코드 조회" />
    </LinearLayout>

    <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:layout_width="match_parent"
                android:layout_height="wrap_content" />

        </LinearLayout>

    </ScrollView>

</LinearLayout>

* SQLite 다운로드

https://sqlitebrowser.org/dl/

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디츠

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

,

gson 사용법

android 2020. 2. 4. 23:32

* MainActivity.java

public class MainActivity extends AppCompatActivity {

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

        Student student = new Student(1, "김하나", 90, 90, 90);

        // object > json
        Gson gson = new Gson();
        String gsonObject = gson.toJson(student);
        println("gson Object : " + gsonObject);

        HashMap<Integer, String> hashmap = new HashMap<Integer, String>();
        hashmap.put(1, "김하나");
        hashmap.put(2, "김두나");
        hashmap.put(3, "김세나");

        // hashmap > json
        Gson gson2 = new Gson();
        String gsonHashmap = gson2.toJson(hashmap);
        println("gson Hashmap : " + gsonHashmap);

        // json > Object
        Gson gson3 = new Gson();
        Student gsonJson = gson3.fromJson(gsonObject, Student.class);
        println("번호 : " + gsonJson.getNum() + ", 이름 : " + gsonJson .getName());
    }

    public void println(String data) {
        Log.d("MainActivity", data);
    }

}

* Gradle

dependencies {
    implementation 'com.google.code.gson:gson:2.8.5'
}

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블로그 이미지

디츠

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

,

Volley 사용법

android 2020. 2. 4. 19:34

* MainActivity.java

public class MainActivity extends AppCompatActivity {

    EditText editText;
    TextView textView;

    static RequestQueue requestQueue;

    @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) {
                String urlStr = editText.getText().toString();
                request(urlStr);
            }
        });

        requestQueue = Volley.newRequestQueue(getApplicationContext());
    }

    public void request(String urlStr) {
        StringRequest request = new StringRequest(
                Request.Method.GET,
                urlStr,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        println("응답 :" + response);
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        println("에러 : " + error.toString());
                    }
                }
        ) {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> params = new HashMap<String, String>();

                return params;
            }
        };

        request.setShouldCache(false);
        requestQueue.add(request);
        println("요청 보냄");
    }

    public void println(String data) {
        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>

* Gradle

dependencies {
    implementation 'com.android.volley:volley:1.1.0'
}

* AndroidManifest.xml

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

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디츠

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

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