实例介绍
【实例简介】
Singal Acquisition android传感器（线性加速度、陀螺仪、磁场）信号实时获取，实时监测指定wifi、蓝牙信号强度
【实例截图】
【核心代码】
package com.example.wenjieli.singalacquisition;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.bluetooth.BluetoothDevice;
import android.widget.Toast;
import org.w3c.dom.Text;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import android.bluetooth.*;
public class MainActivity extends AppCompatActivity implements SensorEventListener {
private SensorManager mSensorManager;
private Sensor mAcc;//加速度计
private Sensor mGyr;//陀螺仪
private Sensor mMag;//磁场
private float[] accValues = new float[3], gyrValues = new float[3], magValues = new float[3];//存放传感器获取的值
private TextView acctv, gyrtv, magtv, wifitv, bttv;
private Button save5;
private int writeSQL = 0;//写入数据库开关：0否1是
private File file = new File("//sdcard/mydb.db");
private SQLiteDatabase db;
private long timeToSave;//记录开始写入数据的时间，作为数据库表的名称
private WifiManager wifiManager;
private Map<String, Integer> map = new HashMap<>();//存放要显示的wifi列表
private List<String> dbList;
private ArrayList<String> checkedWifiList;//传入的选中wifi列表
private ArrayList<String> checkedBtList;//传入的选中蓝牙列表
private BluetoothAdapter mBluetoothAdapter;
private Set<BluetoothDevice> btDevices = new HashSet<>();
private Map<String, Short> btMap = new HashMap<>();//存放要显示的蓝牙列表
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
db = SQLiteDatabase.openOrCreateDatabase(file, null);//打开或创建数据库
mSensorManager = (SensorManager) getSystemService(this.SENSOR_SERVICE);
mAcc = mSensorManager.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION);//加速度计
mGyr = mSensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);//陀螺仪
mMag = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);//磁场
save5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (writeSQL == 0) {
writeSQL = 1;
timeToSave = System.currentTimeMillis();
dbList = new ArrayList<String>();
} else {
//loading...
writeSQL = 0;
db.execSQL("CREATE TABLE t" timeToSave " (time INT, acc1 REAL, acc2 REAL, acc3 REAL, gyr1 REAL, gyr2 REAL, gyr3 REAL, mag1 REAL, mag2 REAL, mag3 REAL, wifi TEXT, bluetooth TEXT)");
save5.setClickable(false);
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < dbList.size(); i ) {
db.execSQL(dbList.get(i));
//Log.i("AAA",dbList.get(i).toString());
}
Message msg1 = new Message();
msg1.what = 1;
mHandler.sendMessage(msg1);
}
}).start();
save5.setText("正在写入...");
//loading vanish
}
}
});
wifiThread.start();
btThread.start();
}
public void initView() {
acctv = (TextView) findViewById(R.id.acc);
gyrtv = (TextView) findViewById(R.id.gyr);
magtv = (TextView) findViewById(R.id.mag);
save5 = (Button) findViewById(R.id.save5);
wifitv = (TextView) findViewById(R.id.wifi);
bttv = (TextView) findViewById(R.id.bluetooth);
checkedWifiList = getIntent().getStringArrayListExtra("wifi");
checkedBtList = getIntent().getStringArrayListExtra("bluetooth");
//bttv.setText(checkedBtList.toString() "");
wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
}
@Override
public void onSensorChanged(SensorEvent sensorEvent) {
switch (sensorEvent.sensor.getType()) {
case Sensor.TYPE_LINEAR_ACCELERATION://加速度计
accValues[0] = sensorEvent.values[0];
accValues[1] = sensorEvent.values[1];
accValues[2] = sensorEvent.values[2];
acctv.setText("加速度计：\n" accValues[0] "\n" accValues[1] "\n" accValues[2] "\n");
if (writeSQL == 1) {
save5.setText((int) ((System.currentTimeMillis() - timeToSave) / 1000) "s");
dbList.add("INSERT INTO t" timeToSave " VALUES(" System.currentTimeMillis() "," accValues[0] "," accValues[1] "," accValues[2] "," gyrValues[0] "," gyrValues[1] "," gyrValues[2] "," magValues[0] "," magValues[1] "," magValues[2] ",'" map.toString() "','" btMap.toString() "')");
//Log.i("BBB","INSERT INTO t" timeToSave " VALUES(" System.currentTimeMillis() "," accValues[0] "," accValues[1] "," accValues[2] "," gyrValues[0] "," gyrValues[1] "," gyrValues[2] "," magValues[0] "," magValues[1] "," magValues[2] ",'" map.toString() "','" btMap.toString() "')");
}
break;
case Sensor.TYPE_GYROSCOPE://陀螺仪
gyrValues[0] = sensorEvent.values[0];
gyrValues[1] = sensorEvent.values[1];
gyrValues[2] = sensorEvent.values[2];
gyrtv.setText("陀螺仪：\n" gyrValues[0] "\n" gyrValues[1] "\n" gyrValues[2] "\n");
break;
case Sensor.TYPE_MAGNETIC_FIELD://磁场
magValues[0] = sensorEvent.values[0];
magValues[1] = sensorEvent.values[1];
magValues[2] = sensorEvent.values[2];
magtv.setText("磁场：\n" magValues[0] "\n" magValues[1] "\n" magValues[2] "\n");
break;
default:
break;
}
}
//扫描wifi
Thread wifiThread = new Thread(new Runnable() {
@Override
public void run() {
synchronized (this) {
while (true) {
//map.clear();
wifiManager.startScan();
ArrayList<ScanResult> list = (ArrayList<ScanResult>) wifiManager.getScanResults();
for (int i = 0; i < list.size(); i ) {
for (int j = 0; j < checkedWifiList.size(); j ) {
if (list.get(i).SSID.equals(checkedWifiList.get(j))) {
map.put(list.get(i).SSID, list.get(i).level);
}
}
}
Message msg = new Message();
msg.what = 0;
mHandler.sendMessage(msg);
}
}
}
});
//扫描蓝牙
Thread btThread = new Thread(new Runnable() {
@Override
public void run() {
synchronized (this) {
while (true) {
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
mBluetoothAdapter.startDiscovery();
}
}
}
});
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(BluetoothDevice.ACTION_FOUND)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
btDevices.add(device);
short rssi = intent.getExtras().getShort(BluetoothDevice.EXTRA_RSSI);
for(int i=0;i<checkedBtList.size();i ){
if(device.getName().equals(checkedBtList.get(i))){
btMap.put(device.getName() "", rssi);
}
}
Message msg = new Message();
msg.what = 2;
mHandler.sendMessage(msg);
}
}
};
Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 0:
wifitv.setText("WIFI：\n" map.toString() "\n");
break;
case 1:
save5.setText("保存数据");
save5.setClickable(true);
break;
case 2:
bttv.setText("Bluetooth：\n" btMap.toString());
break;
}
}
};
//定时任务
private Handler timerHandler = new Handler();
private Runnable task = new Runnable() {
@Override
public void run() {
timerHandler.postDelayed(this,50);//50ms
}
};
/********************************************************************************/
/********************************* 生命周期函数 *********************************/
/********************************************************************************/
@Override
public void onAccuracyChanged(Sensor sensor, int i) {
//传感器获取精度变化时触发
}
@Override
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mAcc, SensorManager.SENSOR_DELAY_NORMAL);//加速度计
mSensorManager.registerListener(this, mGyr, SensorManager.SENSOR_DELAY_NORMAL);//陀螺仪
mSensorManager.registerListener(this, mMag, SensorManager.SENSOR_DELAY_NORMAL);//磁场
registerReceiver(mReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
}
@Override
protected void onPause() {
super.onPause();
mSensorManager.unregisterListener(this);
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mReceiver);
}
//再按一次返回键退出
private long temptime = 0;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && (event.getAction() == KeyEvent.ACTION_DOWN)) {
if (System.currentTimeMillis() - temptime > 2000) // 2s内再次选择back键有效
{
System.out.println(Toast.LENGTH_LONG);
Toast.makeText(this, "再按一次返回键退出", Toast.LENGTH_LONG).show();
temptime = System.currentTimeMillis();
} else {
finish();
System.exit(0); //凡是非零都表示异常退出!0表示正常退出!
}
return true;
}
return super.onKeyDown(keyCode, event);
}
}
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