使用Android Studio制作一个完整的有蓝牙模块，称重模块，数据库，储存列表等功能的电子秤需要什么代码

制作一个完整的有蓝牙模块，称重模块，数据库，储存列表等功能的电子秤需要以下代码：

1. 蓝牙模块：

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
   //设备不支持蓝牙
}
if (!mBluetoothAdapter.isEnabled()) {
   //蓝牙未开启
   Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
   startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}

2. 称重模块：

使用称重传感器获取数据，并进行重量计算。

private SensorManager sensorManager;
private Sensor sensor;
private SensorEventListener sensorEventListener;

sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sensorEventListener = new SensorEventListener() {
   @Override
   public void onSensorChanged(SensorEvent event) {
       //获取传感器数据
   }

   @Override
   public void onAccuracyChanged(Sensor sensor, int accuracy) {

   }
};
sensorManager.registerListener(sensorEventListener, sensor, SensorManager.SENSOR_DELAY_NORMAL);

3. 数据库：

使用SQLite数据库进行数据存储，创建数据库及表格：

public class DatabaseHelper extends SQLiteOpenHelper {
   private static final String DATABASE_NAME = "weight.db";
   private static final int DATABASE_VERSION = 1;

   public DatabaseHelper(Context context) {
       super(context, DATABASE_NAME, null, DATABASE_VERSION);
   }

   @Override
   public void onCreate(SQLiteDatabase db) {
       db.execSQL("CREATE TABLE weight (_id INTEGER PRIMARY KEY AUTOINCREMENT, date TEXT, weight TEXT);");
   }

   @Override
   public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

   }
}

插入数据：

DatabaseHelper dbHelper = new DatabaseHelper(this);
SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("date", "2022-01-01");
values.put("weight", "50kg");
db.insert("weight", null, values);

查询数据：

Cursor cursor = db.query("weight", null, null, null, null, null, null);
if (cursor.moveToFirst()) {
   do {
       String date = cursor.getString(cursor.getColumnIndex("date"));
       String weight = cursor.getString(cursor.getColumnIndex("weight"));
   } while (cursor.moveToNext());
}

4. 储存列表：

使用RecyclerView进行列表展示，创建Adapter：

public class WeightAdapter extends RecyclerView.Adapter<WeightAdapter.ViewHolder> {
   private List<Weight> mWeightList;

   static class ViewHolder extends RecyclerView.ViewHolder {
       TextView dateText;
       TextView weightText;

       public ViewHolder(View view) {
           super(view);
           dateText = (TextView) view.findViewById(R.id.date_text);
           weightText = (TextView) view.findViewById(R.id.weight_text);
       }
   }

   public WeightAdapter(List<Weight> weightList) {
       mWeightList = weightList;
   }

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

   @Override
   public void onBindViewHolder(ViewHolder holder, int position) {
       Weight weight = mWeightList.get(position);
       holder.dateText.setText(weight.getDate());
       holder.weightText.setText(weight.getWeight());
   }

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

在Activity中使用RecyclerView：

RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
WeightAdapter adapter = new WeightAdapter(weightList);
recyclerView.setAdapter(adapter);