实例介绍
【实例截图】
【核心代码】
package edu.lsnu.scope; import android.content.Context; import android.graphics.Color; import android.hardware.Sensor; import android.hardware.SensorManager; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; import java.io.BufferedWriter; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.util.Arrays; import java.util.LinkedList; import java.util.List; public class MainActivity extends AppCompatActivity implements View.OnClickListener { //sensorManager instance used to create Sensor_Manager's SensorManager sensorManager; //linegraphview for displaying accelerometer data LineGraphView graph; //List of each sensor manager (each one responsible for handling a different sensor) LinkedList<Sensor_Manager> managers; //clear readings button int btn_clear = 1; //record last 100 readings button int btn_record = 2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //setup the UI and initialize sensor event managers doInitialize(); } private void doInitialize() { //initialize the sensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); //add UI controls and event handlers for sensors doInitializeSensors(); } private void doInitializeSensors() { //get a reference to the linearlayout LinearLayout linlayout = (LinearLayout) findViewById(R.id.LinearLayoutDisplay); //create a new graph instance with the specified withd and height graph = new LineGraphView(getApplicationContext(), 100, Arrays.asList("x", "y", "z"), 1020, 600); graph.setVisibility(View.VISIBLE); //add teh graph to teh linearlayout linlayout.addView(graph); //create button for clearing min/max readings Button btn_clearMinMax = new Button(getApplicationContext()); btn_clearMinMax.setText("Clear Historical Min/Max"); btn_clearMinMax.setOnClickListener(this); //set the id of the button so we can refer to it later btn_clearMinMax.setId(btn_clear); linlayout.addView(btn_clearMinMax); //create button for recording last 100 readins of accelerometer Button btn_Recordvalues = new Button(getApplicationContext()); btn_Recordvalues.setText("Record last 100 readings"); btn_Recordvalues.setOnClickListener(this); //set the id of the button so we can refer to it later btn_Recordvalues.setId(btn_record); linlayout.addView(btn_Recordvalues); //List of sensor types that we want to create a Sensor_Manger for List<Sensor> SensorsToUse = new LinkedList<Sensor>(); managers = new LinkedList<Sensor_Manager>(); //add the 5 types of sensors SensorsToUse.add(sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)); SensorsToUse.add(sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT)); SensorsToUse.add(sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD)); SensorsToUse.add(sensorManager.getDefaultSensor(Sensor.TYPE_ROTATION_VECTOR)); SensorsToUse.add(sensorManager.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION)); //create and initialize displays and handlers for each sensor for (Sensor s : SensorsToUse) { //create the textview for displaying realtime values TextView tv = new TextView(getApplicationContext()); //create the textview for displaying min/mas values TextView tvm = new TextView(getApplicationContext()); //set the text color and initialize the textview to a default message tv.setTextColor(Color.BLUE); tv.setText("No Sensor Present"); tvm.setTextColor(Color.BLUE); tvm.setText("No Sensor Present"); //add the textviews to the linearlayout linlayout.addView(tv); linlayout.addView(tvm); //create a new Sensor_Manager instance for the sensor Sensor_Manager sm = new Sensor_Manager(tv, tvm, graph); //if accelerometer we are initializing set its update speed to GAME_DELAY if (s == sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)) { sensorManager.registerListener(sm, s, SensorManager.SENSOR_DELAY_GAME); } else { sensorManager.registerListener(sm, s, SensorManager.SENSOR_DELAY_NORMAL); } //add this manager to our list of Sensor_Managers so we can refer to it later managers.add(sm); } } //write the last 100 readings to a .csv file private int recordData() { //initialize the printwriter PrintWriter writer = null; try { //create the filepath for our output file File path = new File(getExternalFilesDir("Recorded Data"), "AccelerometerReadings.csv"); //open the file FileOutputStream sData = new FileOutputStream(path); OutputStreamWriter myOutWriter = new OutputStreamWriter(sData); BufferedWriter myBufferedWriter = new BufferedWriter(myOutWriter); writer = new PrintWriter(myBufferedWriter); //get the values to record float[][] values = managers.get(0).collectHistory(); //write headings for columns writer.println("X,Y,Z"); //write comma delimited values for (int i = 0; i < 100; i ) { //write the values to the debug log for faster access to the values (during debugging) Log.d("Data", String.format("%f,%f,%f", values[0][i], values[1][i], values[2][i])); //write the values to the file writer.println(String.format("%f,%f,%f", values[0][i], values[1][i], values[2][i])); } //close the printwriter writer.close(); } catch (IOException ex) { //log any errors Log.e("ERROR WRITING TO FILE", ex.toString()); //failed to write values return -1; } finally { //ensure the file is closed when done if (writer != null) { writer.close(); } } //values successfully written return 0; } @Override //handle button clicks public void onClick(View v) { //was the clear min/max values button if (v.getId() == btn_clear) { Context clearContext = getApplicationContext(); //display message to user that the values were cleared CharSequence clearText = "Cleared all maximum/minimum values!"; int clearDuration = Toast.LENGTH_SHORT; Toast.makeText(clearContext, clearText, clearDuration).show(); //clear all the sensors min/max values for (Sensor_Manager sm : managers) { sm.ClearMinMax(); } } //was the record last 100 values button else if (v.getId() == btn_record) { //record data - store the result of the write opperation in recorded (0 = written, -1 = failed to write) int recorded = recordData(); Context historyContext = getApplicationContext(); //display message to user that the values were recorded CharSequence historyText = "Recorded last 100 accelerometer values!"; CharSequence historyTextFailed = "FAILED to Record last 100 accelerometer values!"; int historyDuration = Toast.LENGTH_SHORT; //display message to user if (recorded == 0) { Toast.makeText(historyContext, historyText, historyDuration).show(); } else { Toast.makeText(historyContext, historyTextFailed, historyDuration).show(); } } } }
标签: 传感器
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