Android测试光照强度的简易APP

package com.peanuo.lighttest; import androidx.appcompat.app.AppCompatActivity; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.ListView; import android.widget.Toast; import com.peanuo.lighttest.database.LightAdapter; import com.peanuo.lighttest.database.LightHelper; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { Button start; Button delete; ListView listView; SensorManager sensorManager; Sensor sensor; volatile boolean isTesting = false; public static List<Light> lightList; double light; LightAdapter lightAdapter; LightHelper lightHelper; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); start = findViewById(R.id.start); delete = findViewById(R.id.delete); listView = findViewById(R.id.list_view); sensorManager = (SensorManager)this.getSystemService(SENSOR_SERVICE); assert sensorManager != null; sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT); final TestThread testThread = new TestThread(); lightHelper = new LightHelper(this); showData(); start.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (isTesting){ isTesting = false; start.setText(R.string.start); delete.setEnabled(true); testThread.interrupt(); Toast.makeText(MainActivity.this,"停止测试",Toast.LENGTH_SHORT).show(); } else { isTesting = true; start.setText(R.string.stop); delete.setEnabled(false); testThread.start(); Toast.makeText(MainActivity.this,"3秒后自动开始测试",Toast.LENGTH_SHORT).show(); } } }); delete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (lightHelper.deleteData(MainActivity.this)){ Toast.makeText(MainActivity.this,"成功删除数据缓存",Toast.LENGTH_SHORT).show(); lightList.clear(); lightAdapter.notifyDataSetChanged(); } else { Toast.makeText(MainActivity.this,"删除数据失败！！！",Toast.LENGTH_SHORT).show(); } } }); } //展示和更新ListView的数据 private void showData(){ if (lightList != null){ lightList.clear(); } lightList = lightHelper.query(); lightAdapter = new LightAdapter(this, lightList); listView.setAdapter(lightAdapter); } //传感器的监听 private SensorEventListener sensorEventListener = new SensorEventListener() { @Override public void onSensorChanged(SensorEvent event) { light = event.values[0]; } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } }; @Override protected void onResume() { super.onResume(); sensorManager.registerListener(sensorEventListener, sensor, SensorManager.SENSOR_DELAY_NORMAL); } @Override protected void onPause() { super.onPause(); sensorManager.unregisterListener(sensorEventListener); } //开始测试的线程 private class TestThread extends Thread{ @Override public void run() { super.run(); while (isTesting){ try { Thread.sleep(4000); if (lightHelper.insertData(light)) { Log.i("Light","光照强度："+light); } } catch (InterruptedException e) { e.printStackTrace(); Log.i("Thread","测试线程已停止"); //break; } MainActivity.this.runOnUiThread(new Runnable() { @Override public void run() { showData(); } }); } } } }