android 相机判断水平

目录

添加权限：

[android 相机判断水平java代码](#android 相机判断水平java代码)

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添加权限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-feature android:name="android.hardware.sensor.accelerometer"/>
<uses-feature android:name="android.hardware.sensor.gyroscope"/>

android 相机判断水平java代码

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity implements SensorEventListener {

    private SensorManager sensorManager;
    private Sensor accelerometer;
    private Sensor gyroscope;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        gyroscope = sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
        
        sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
        sensorManager.registerListener(this, gyroscope, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onResume() {
        super.onResume();
        sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
        sensorManager.registerListener(this, gyroscope, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onPause() {
        super.onPause();
        sensorManager.unregisterListener(this);
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            float[] gravity = event.values;
            float x = gravity[0];
            float y = gravity[1];
            float z = gravity[2];

            double angle = Math.toDegrees(Math.acos(z / Math.sqrt(x * x + y * y + z * z)));

            // 判断设备是否水平
            if (angle < 5) {
                Toast.makeText(this, "设备水平", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "设备不水平", Toast.LENGTH_SHORT).show();
            }
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // 不需要实现
    }
}