Android Sensor 示例demo

package com.example.codeprojectandroid.accelerometersample; import android.app.Activity; import android.graphics.Color; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.RelativeLayout; import android.widget.TextView; public class AccelerometerActivity extends Activity implements SensorEventListener { private SensorManager sensorManager; private long lastUpdate; private int color = Color.RED; RelativeLayout relativeLayout; TextView textViewX; TextView textViewY; TextView textViewZ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_accelerometer); relativeLayout = (RelativeLayout)findViewById(R.id.relativeLayout1); textViewX = (TextView)findViewById(R.id.textViewX); textViewY = (TextView)findViewById(R.id.textViewY); textViewZ = (TextView)findViewById(R.id.textViewZ); // Get the SensorManager instance sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); lastUpdate = System.currentTimeMillis(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.accelerometer, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } @Override public void onSensorChanged (SensorEvent event) { DisplayAccelerometerReadings(event); CheckShake(event); } private void DisplayAccelerometerReadings(SensorEvent event) { float x = event.values[0]; float y = event.values[1]; float z = event.values[2]; textViewX.setText("X axis reading: " + x); textViewY.setText("Y axis reading: " + y); textViewZ.setText("Z axis reading: " + z); } private void CheckShake(SensorEvent event) { // Movement float x = event.values[0]; float y = event.values[1]; float z = event.values[2]; float accelerationSquareRoot = (x * x + y * y + z * z) / (SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH); long actualTime = System.currentTimeMillis(); if (accelerationSquareRoot >= 2) // { if (actualTime - lastUpdate < 200) { return; } lastUpdate = actualTime; if (color == Color.RED) { relativeLayout.setBackgroundColor(Color.YELLOW); color = Color.YELLOW; } else { relativeLayout.setBackgroundColor(Color.RED); color = Color.RED; } } } @Override protected void onResume() { super.onResume(); sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL); } @Override protected void onPause() { super.onPause(); sensorManager.unregisterListener(this); } }