graph TD;
    A[启动应用] --> B[初始化传感器]
    B --> C[采集数据]
    C --> D[存储数据至数据库]
    D --> E[读取并处理数据]
    E --> F[生成统计图表]
    F --> G[用户界面展示]

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// 初始化传感器
SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
Sensor stepCounter = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
sensorManager.registerListener(stepListener, stepCounter, SensorManager.SENSOR_DELAY_NORMAL);

private SensorEventListener stepListener = new SensorEventListener() {
    @Override
    public void onSensorChanged(SensorEvent event) {
        int steps = (int) event.values[0];
        // 存储步数至数据库
        saveStepDataToDatabase(steps);
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {}
};
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LineChart lineChart = findViewById(R.id.lineChart);
List<Entry> entries = new ArrayList<>();
// 假设我们有一个方法getDailySteps()返回每天的步数列表
List<Integer> dailySteps = getDailySteps();
for (int i = 0; i < dailySteps.size(); i++) {
    entries.add(new Entry(i, dailySteps.get(i)));
}
LineDataSet dataSet = new LineDataSet(entries, "每日步数");
LineData lineData = new LineData(dataSet);
lineChart.setData(lineData);
lineChart.invalidate(); // 刷新图表
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@Test
public void testSensorDataCollection() {
    // 模拟传感器数据
    int mockSteps = 100;
    saveStepDataToDatabase(mockSteps);

    // 从数据库检索数据
    int retrievedSteps = getStepsFromDatabase();
    assertEquals(mockSteps, retrievedSteps);
}

@Test
public void testChartDisplay() {
    // 模拟数据
    List<Integer> mockData = Arrays.asList(1000, 2000, 1500, 3000);
    List<Entry> entries = new ArrayList<>();
    for (int i = 0; i < mockData.size(); i++) {
        entries.add(new Entry(i, mockData.get(i)));
    }
    LineDataSet dataSet = new LineDataSet(entries, "测试步数");
    LineData lineData = new LineData(dataSet);

    // 验证图表数据
    assertEquals(lineData.getEntryCount(), mockData.size());
}
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