package host.skyone.lifecycle;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;

public class MainActivity extends AppCompatActivity {
    String msg = "Android: ";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.d(msg, "The onCreate() event");
    }

    /** 当活动即将可见时调用 */
    @Override
    protected void onStart() {
        super.onStart();
        Log.d(msg, "The onStart() event");
    }

    /** 当活动可见时调用 */
    @Override
    protected void onResume() {
        super.onResume();
        Log.d(msg, "The onResume() event");
    }

    /** 当其他活动获得焦点时调用 */
    @Override
    protected void onPause() {
        super.onPause();
        Log.d(msg, "The onPause() event");
    }

    /** 当活动不再可见时调用 */
    @Override
    protected void onStop() {
        super.onStop();
        Log.d(msg, "The onStop() event");
    }

    /** 当活动将被销毁时调用 */
    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(msg, "The onDestroy() event");
    }
}

package host.skyone.lifecycle;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void startService(View view) {
        startService(new Intent(getBaseContext(), MyService.class));
    }

    public void endService(View view) {
        stopService(new Intent(getBaseContext(), MyService.class));
    }
}

package host.skyone.lifecycle;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;

public class MyService extends Service {
    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        return null;

        // throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Toast.makeText(this, "服务启动成功！", Toast.LENGTH_LONG).show();
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Toast.makeText(this, "服务关闭成功！", Toast.LENGTH_LONG).show();
    }
}

package host.skyone.broadcastreceiver;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
    public static final String EXTRA_MESSAGE = "host.skyone.broadcastreceiver.MESSAGE";

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

    public void sendMessage(View view) {
        EditText editText = (EditText) findViewById(R.id.editArea);
        String msg = editText.getText().toString();
        Intent intent = new Intent(this, MyReceiver.class);
        intent.putExtra(EXTRA_MESSAGE, msg);
        sendBroadcast(intent);
    }
}

package host.skyone.broadcastreceiver;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        String msg = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
        Toast.makeText(context,"侦测到广播信息:" + msg, Toast.LENGTH_LONG).show();
    }
}

package host.skyone.contentprovider;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

    public void onClickAddStudent(View view) {
        ContentValues values = new ContentValues();

        values.put(StudentProvider.NAME,
                ((EditText) findViewById(R.id.nameEditText)).getText().toString());
        values.put(StudentProvider.SEX,
                ((EditText) findViewById(R.id.sexEditText)).getText().toString());
        Uri uri = getContentResolver().insert(StudentProvider.CONTENT_URI, values);

        Toast.makeText(getBaseContext(), uri.toString(), Toast.LENGTH_LONG).show();
    }

    public void onClickSearchStudent(View view) {
        String URL = "content://host.skyone.contentprovider.College/students";

        Uri students = Uri.parse(URL);
        //Cursor c = managedQuery(students, null, null, null, "name");
        Cursor cursor = getContentResolver().query(students, null, null, null, "name");
        if (cursor.moveToFirst()) {
            do{
                Toast.makeText(this,
                        cursor.getString(cursor.getColumnIndex(StudentProvider._ID)) +
                                ", " +  cursor.getString(cursor.getColumnIndex( StudentProvider.NAME)) +
                                ", " + cursor.getString(cursor.getColumnIndex( StudentProvider.SEX)),
                        Toast.LENGTH_SHORT).show();
            } while (cursor.moveToNext());
        }
        cursor.close();
    }

    public void onClickDeleteStudent(View view) {
        String URL = "content://host.skyone.contentprovider.College/students";

        Uri students = Uri.parse(URL);
        //Cursor c = managedQuery(students, null, null, null, "name");
        getContentResolver().delete(Uri.parse(URL), "", null);
    }
}

package host.skyone.contentprovider;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Context;
import android.content.ContentUris;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.text.TextUtils;

import java.util.HashMap;

public class StudentProvider extends ContentProvider {

    public static final String PROVIDER_NAME = "host.skyone.contentprovider.College";
    public static final String URL = "content://" + PROVIDER_NAME + "/students";
    public static final Uri CONTENT_URI = Uri.parse(URL);

    public static final String _ID = "_id";
    public static final String NAME = "name";
    public static final String SEX = "sex";

    private HashMap<String, String> STUDENT_PROJECTION_MAP;

    public static final int STUDENTS = 1;
    public static final int STUDENT_ID = 2;

    public static final UriMatcher uriMatcher;

    static {
        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        uriMatcher.addURI(PROVIDER_NAME, "students", STUDENTS);
        uriMatcher.addURI(PROVIDER_NAME, "students/#", STUDENT_ID);
    }

    private SQLiteDatabase db;
    static final String DATABASE_NAME = "College";
    static final String STUDENTS_TABLE_NAME = "students";
    static final int DATABASE_VERSION = 2;
    static final String CREATE_DB_TABLE =
            " CREATE TABLE " + STUDENTS_TABLE_NAME +
                    " (_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
                    " name TEXT NOT NULL, " +
                    " sex TEXT NOT NULL);";

    private static class DatabaseHelper extends SQLiteOpenHelper {
        DatabaseHelper(Context content) {
            super(content, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL(CREATE_DB_TABLE);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            db.execSQL("DROP TABLE IF EXISTS " + STUDENTS_TABLE_NAME);
            onCreate(db);
        }
    }

    public StudentProvider() {
    }

    @Override
    public boolean onCreate() {
        Context context = getContext();
        DatabaseHelper databaseHelper = new DatabaseHelper(context);

        // TODO: Implement this to initialize your content provider on startup.
        db = databaseHelper.getWritableDatabase();
        return db != null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        long rowID = db.insert(STUDENTS_TABLE_NAME, "", values);

        if (rowID > 0) {
            // TODO: Implement this to handle requests to insert a new row.

            Uri _uri = ContentUris.withAppendedId(CONTENT_URI, rowID);
            getContext().getContentResolver().notifyChange(_uri, null);
            return uri;
        }
        throw new SQLiteException("Failed to add a record into " + uri);
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
                        String[] selectionArgs, String sortOrder) {
        SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
        queryBuilder.setTables(STUDENTS_TABLE_NAME);

        switch (uriMatcher.match(uri)) {
            case STUDENTS:
                queryBuilder.setProjectionMap(STUDENT_PROJECTION_MAP);
                break;
            case STUDENT_ID:
                queryBuilder.appendWhere(_ID + "=" + uri.getPathSegments().get(1));
                break;
            default:
                throw new IllegalArgumentException("Unknown URI " + uri);
        }

        if (sortOrder == null || sortOrder.equals("")) {
            sortOrder = NAME;
        }

        // TODO: Implement this to handle query requests from clients.
        Cursor cursor = queryBuilder.query(db, projection, selection, selectionArgs, null, null, sortOrder);
        cursor.setNotificationUri(getContext().getContentResolver(), uri);
        return cursor;
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        // Implement this to handle requests to delete one or more rows.
        int count = 0;

        switch (uriMatcher.match(uri)) {
            case STUDENTS:
                count = db.delete(STUDENTS_TABLE_NAME, selection, selectionArgs);
                break;

            case STUDENT_ID:
                String id = uri.getPathSegments().get(1);
                count = db.delete(STUDENTS_TABLE_NAME, _ID + " = " + id +
                        (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""), selectionArgs);
                break;

            default:
                throw new IllegalArgumentException("Unknown URI " + uri);
        }

        getContext().getContentResolver().notifyChange(uri, null);
        return count;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection,
                      String[] selectionArgs) {
        int count = 0;

        // TODO: Implement this to handle requests to update one or more rows.
        switch (uriMatcher.match(uri)) {
            case STUDENTS:
                count = db.update(STUDENTS_TABLE_NAME, values, selection, selectionArgs);
                break;

            case STUDENT_ID:
                count = db.update(STUDENTS_TABLE_NAME, values, _ID + " = " + uri.getPathSegments().get(1) +
                        (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""), selectionArgs);
                break;

            default:
                throw new IllegalArgumentException("Unknown URI " + uri);
        }
        getContext().getContentResolver().notifyChange(uri, null);
        return count;
    }

    @Override
    public String getType(Uri uri) {
        // TODO: Implement this to handle requests for the MIME type of the data
        // at the given URI.
        switch (uriMatcher.match(uri)) {
            case STUDENTS:
                return "vnd.android.cursor.dir/vnd.example.students";

            case STUDENT_ID:
                return "vnd.android.cursor.item/vnd.example.students";

            default:
                throw new IllegalArgumentException("Unsupported URI: " + uri);
        }
    }
}