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Android基于多种手机传感器开发指南针的项目
1、基于方向传感器 2、基于加速度传感器和磁场传感器 基于方向传感器的指南针Java代码——TypeOneActivity.java文件 package com.example.compass00; import android.app.Activity; import android.content.Intent; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.view.View; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.ImageView; import android.widget.TextView; import androidx.annotation.Nullable; import java.util.List; public class TypeOneActivity extends Activity implements View.OnClickListener, SensorEventListener { //使用方向传感器编写指南针 public SensorManager sensorManager; private float currentDegree; private TextView tvDirection; //指南针文字显示方位控件 private float azimuth = 0f; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); currentDegree = 0f; sensorManager = (SensorManager) this.getSystemService(SENSOR_SERVICE); setContentView(R.layout.compass00); TextView return00 = findViewById(R.id.retuen); return00.setOnClickListener(this); TextView exit = findViewById(R.id.exit); exit.setOnClickListener(this); tvDirection = (TextView) findViewById(R.id.value01); } @Override public void onResume() { //为方向传感器注册监听器 super.onResume(); List sensors = sensorManager.getSensorList(Sensor.TYPE_ORIENTATION); for (Sensor s : sensors) { sensorManager.registerListener(this, s, SensorManager.SENSOR_DELAY_FASTEST); } } @Override public void onClick(View v) { Intent intent; switch (v.getId()) { case R.id.retuen: intent = new Intent(this, MainActivity.class); startActivity(intent); finish(); break; case R.id.exit: intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_HOME); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); finish(); break; } } @Override public void onSensorChanged(SensorEvent event) { TextView value = findViewById(R.id.value); ImageView imageView = findViewById(R.id.compass); float[] values = event.values; StringBuilder stringBuilder = new StringBuilder(); if (event.sensor.getType() == Sensor.TYPE_ORIENTATION) { stringBuilder.append("方向传感器的返回值："); stringBuilder.append("\nvalues[0]:" + values[0]); stringBuilder.append("\nvalues[1]:" + values[1]); stringBuilder.append("\nvalues[2]:" + values[2]); value.setText(stringBuilder.toString()); float degree = event.values[0]; //取围绕z轴转过的角度 azimuth = (degree + 360) % 360; RotateAnimation rotateAnimation = new RotateAnimation(currentDegree, -degree, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); if (azimuth = 345) { tvDirection.setText("方位：北"); } else if (15 tvDirection.setText("方位：东"); } else if (105 tvDirection.setText("方位：南"); } else if (195 tvDirection.setText("方位：西"); } else if (285 } }布局文件——compass00.xml文件 基于加速度传感器和磁场传感器Java代码——TypeTwoActivity.Java文件 package com.example.compass00; import android.app.Activity; import android.content.Intent; 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.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.ImageView; import android.widget.TextView; import androidx.annotation.Nullable; public class TypeTwoActivity extends Activity implements View.OnClickListener, SensorEventListener { //通过加速度传感器和地磁传感器编写指南针 public SensorManager sensorManager; private Sensor aSensor; //定义加速度传感器 private Sensor mSensor; //定义磁场传感器 private String TAG = "CompassActivity"; public ImageView ivArrow; //指南针指针控件 private TextView tvDirection; //指南针文字显示方位控件 private float[] mGravity = new float[3]; private float[] mGeomagnetic = new float[3]; private float azimuth = 0f; private float currentAzimuth = 0; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.compass01); TextView return00 = findViewById(R.id.retuen); return00.setOnClickListener(this); TextView exit = findViewById(R.id.exit); exit.setOnClickListener(this); initView(); initData(); } @Override protected void onDestroy() { super.onDestroy(); if (sensorManager != null) { sensorManager.unregisterListener(this); } } @Override protected void onResume() { super.onResume(); if (null != sensorManager) { // 注册陀螺仪传感器 sensorManager.registerListener(this, aSensor, SensorManager.SENSOR_DELAY_GAME); // 注册磁场传感器 sensorManager.registerListener(this, mSensor, SensorManager.SENSOR_DELAY_GAME); } } @Override protected void onPause() { super.onPause(); if (null != sensorManager) { sensorManager.unregisterListener(this); // 取消注册陀螺仪传感器 } } @Override public void onClick(View v) { Intent intent; switch (v.getId()) { case R.id.retuen: intent = new Intent(this, MainActivity.class); startActivity(intent); finish(); break; case R.id.exit: intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_HOME); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); finish(); break; } } @Override public void onSensorChanged(SensorEvent event) { final float alpha = 0.97f; synchronized (this) { //指南针转动角度算法 //判断当前是加速度感应器还是地磁感应器 if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) { TextView value00 = findViewById(R.id.value00); float[] values = event.values; StringBuilder stringBuilder = new StringBuilder(); stringBuilder.append("加速度计的返回值："); stringBuilder.append("\nvalues[0]:" + values[0]); stringBuilder.append("\nvalues[1]:" + values[1]); stringBuilder.append("\nvalues[2]:" + values[2]); value00.setText(stringBuilder.toString()); mGravity[0] = alpha * mGravity[0] + (1 - alpha) * event.values[0]; mGravity[1] = alpha * mGravity[1] + (1 - alpha) * event.values[1]; mGravity[2] = alpha * mGravity[2] + (1 - alpha) * event.values[2]; } if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) { TextView value01 = findViewById(R.id.value01); float[] values = event.values; StringBuilder stringBuilder = new StringBuilder(); stringBuilder.append("磁场传感器的返回值："); stringBuilder.append("\nvalues[0]:" + values[0]); stringBuilder.append("\nvalues[1]:" + values[1]); stringBuilder.append("\nvalues[2]:" + values[2]); value01.setText(stringBuilder.toString()); mGeomagnetic[0] = alpha * mGeomagnetic[0] + (1 - alpha) * event.values[0]; mGeomagnetic[1] = alpha * mGeomagnetic[1] + (1 - alpha) * event.values[1]; mGeomagnetic[2] = alpha * mGeomagnetic[2] + (1 - alpha) * event.values[2]; } float R[] = new float[9]; float I[] = new float[9]; boolean success = SensorManager.getRotationMatrix(R, I, mGravity, mGeomagnetic); if (success) { float orientation[] = new float[3]; SensorManager.getOrientation(R, orientation); azimuth = (float) Math.toDegrees(orientation[0]); // orientation azimuth = (azimuth + 360) % 360; adjustArrow(); } } } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } /** * 初始化控件 */ private void initView() { ivArrow = (ImageView) findViewById(R.id.compass); tvDirection = (TextView) findViewById(R.id.value02); } /** * 初始化数据 */ private void initData() { sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); aSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); mSensor = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD); } /** * 陀螺仪方位显示&角度转动 */ private void adjustArrow() { if (ivArrow == null) { return; } Animation an = new RotateAnimation(-currentAzimuth, -azimuth, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); currentAzimuth = azimuth; Log.i(TAG, "azimuth:" + azimuth); if (azimuth = 345) { tvDirection.setText("方位：北"); } else if (15 tvDirection.setText("方位：东"); } else if (105 tvDirection.setText("方位：南"); } else if (195 tvDirection.setText("方位：西"); } else if (285 |
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