Android基于各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<Sensor> 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 <= 15 || azimuth >= 345) {
tvDirection.setText("方位：北");
} else if (15 < azimuth && azimuth < 75) {
tvDirection.setText("方位：东北");
} else if (75 <= azimuth && azimuth <= 105) {
tvDirection.setText("方位：东");
} else if (105 < azimuth && azimuth < 165) {
tvDirection.setText("方位：东南");
} else if (165 <= azimuth && azimuth <= 195) {
tvDirection.setText("方位：南");
} else if (195 < azimuth && azimuth < 255) {
tvDirection.setText("方位：西南");
} else if (255 <= azimuth && azimuth <= 285) {
tvDirection.setText("方位：西");
} else if (285 < azimuth && azimuth < 345) {
tvDirection.setText("方位：西北");
}
rotateAnimation.setDuration(200);
rotateAnimation.setFillAfter(true);
imageView.setAnimation(rotateAnimation);
currentDegree = -degree;
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
布局文件——compass00.xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white">
<RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:background="#A3FBC7">
<RelativeLayout android:id="@+id/top" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_above="@+id/retuen" android:background="@drawable/background01">
<TextView android:id="@+id/title" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_margin="30dp" android:gravity="center" android:text="基于方向传感器" android:textColor="#009688" android:textSize="26dp" />
<ImageView android:id="@+id/compass" android:layout_width="280dp" android:layout_height="280dp" android:layout_below="@+id/title" android:layout_centerHorizontal="true" android:layout_marginTop="30dp" android:src="@drawable/compass" />
<TextView android:id="@+id/value" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/compass" android:layout_alignLeft="@+id/compass" android:layout_alignRight="@+id/compass" android:layout_marginTop="30dp" android:text="方向传感器的返回值：" android:textColor="#FFC107" android:textSize="18dp" />
<TextView android:id="@+id/value01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/value" android:layout_centerHorizontal="true" android:layout_marginTop="30dp" android:background="@color/teal_200" android:gravity="center" android:text="方位" android:textColor="@color/black" android:textSize="38dp" />
</RelativeLayout>
<TextView android:id="@+id/retuen" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentBottom="true" android:layout_marginStart="8dp" android:layout_marginTop="8dp" android:layout_marginEnd="8dp" android:layout_marginBottom="8dp" android:background="@color/teal_700" android:text="返回上一级" android:textColor="@color/black" android:textSize="26dp" />
<TextView android:id="@+id/exit" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_alignParentBottom="true" android:layout_margin="8dp" android:background="#F44336" android:text="退出软件" android:textColor="@color/black" android:textSize="26dp" />
</RelativeLayout>
</LinearLayout>
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.unregisterListe