当我们在 0 到 135 之间时开始意图 Android

Question

这张图片（取自网络）总结了我想在我的 Android 应用程序中实现的目标，但我遇到了一些问题。

基本上当用户在位置1（底部）有smartphone时phone改变activity，当smartphone位置在2时，另一个 activity 应该在屏幕上处于活动状态。

这是我用于陀螺仪的 class，它运行良好，但如果我尝试在 "orient.setText()" 之后启动一个 Intent，它就不起作用。希望有人能帮助我。

编辑：这是完整的工作代码。

    package com.orientation;

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.widget.TextView;

import java.util.List;

public class Orientation extends Activity {
    private TextView orient;
    private Sensor sensor;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        orient = (TextView) findViewById(R.id.orient);
        SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        List<android.hardware.Sensor> sensorList = sensorManager.getSensorList(Sensor.TYPE_GYROSCOPE);
        if (sensorList.size() > 0) {
            sensor = sensorList.get(0);
        } else {
            orient.setText("Orientation sensor not present");
        }
        sensorManager.registerListener(orientationListener, sensor, 0, null);

    }

    private SensorEventListener orientationListener = new SensorEventListener() {

        @Override
        public void onAccuracyChanged(Sensor arg0, int arg1) {

        }

        @Override
        public void onSensorChanged(SensorEvent sensorEvent) {
            if (sensorEvent.sensor.getType() == Sensor.TYPE_GYROSCOPE) {
                float azimuth = sensorEvent.values[0]*180/Math.PI;
                float pitch = sensorEvent.values[1]*180/Math.PI;
                float roll = sensorEvent.values[2]*180/Math.PI;

                if (pitch < -45 && pitch > -135) {

                    orient.setText("Top side of the phone is Up!");
                    Intent top = new Intent(Orientation.this, ActivityA.class);
                    startActivity(top);

                } else if (pitch > 0 && pitch < 135) {

                    orient.setText("Bottom side of the phone is Up!");
                    Intent bottom= new Intent(Orientation.this, ActivityB.class);
                    startActivity(bottom);



                } else if (roll > 45) {

                    orient.setText("Right side of the phone is Up!");

                } else if (roll < -45) {

                    orient.setText("Left side of the phone is Up!");
                }

            }
        }

    };
}

这是我的清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.orientation"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

    <application
        android:icon="@drawable/icon"
        android:label="@string/app_name" >
        <activity
            android:name=".Orientation"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".ActivityB"
            android:label="@string/title_activity_b" />
        <activity
            android:name=".ActivityA"
            android:label="@string/title_activity_a" >
        </activity>
    </application>

</manifest>

Answer 1

首先TYPE_GYROSCOPEreturn角是弧度角，用：

        float azimuth = sensorEvent.values[0]*180/Math.PI;
            float pitch = sensorEvent.values[1]*180/Math.PI;
            float roll = sensorEvent.values[2]*180/Math.PI;

其次，如我所见，您没有启动 Activity，只是试图设置文本。编辑：如果那是 phone 方向的指标，请在正确的位置创建 Intent：

    package com.orientation;

    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.widget.TextView;

    import java.util.List;

    public class Orientation extends Activity {
        private TextView orient;
        private Sensor sensor;

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            orient = (TextView) findViewById(R.id.orient);
            SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
            List<android.hardware.Sensor> sensorList = sensorManager.getSensorList(Sensor.TYPE_GYROSCOPE);
            if (sensorList.size() > 0) {
                sensor = sensorList.get(0);
            } else {
                orient.setText("Orientation sensor not present");
            }
            sensorManager.registerListener(orientationListener, sensor, 0, null);

        }

        private SensorEventListener orientationListener = new SensorEventListener() {

            @Override
            public void onAccuracyChanged(Sensor arg0, int arg1) {

            }

            @Override
            public void onSensorChanged(SensorEvent sensorEvent) {
                if (sensorEvent.sensor.getType() == Sensor.TYPE_GYROSCOPE) {
                    float azimuth = sensorEvent.values[0]*180/Math.PI;
                    float pitch = sensorEvent.values[1]*180/Math.PI;
                    float roll = sensorEvent.values[2]*180/Math.PI;

                    if (pitch < -45 && pitch > -135) {

                        orient.setText("Top side of the phone is Up!");
                        Intent top = new Intent(Orientation.this, <yourTopclass>.class);
                        startActivity(top);

                    } else if (pitch > 0 && pitch < 135) {

                        orient.setText("Bottom side of the phone is Up!");
                        Intent bottom= new Intent(Orientation.this, <yourBottomclass>.class);
                        startActivity(bottom);



                } else if (roll > 45) {

                    orient.setText("Right side of the phone is Up!");

                } else if (roll < -45) {

                    orient.setText("Left side of the phone is Up!");
                }

            }
        }

    };
}

当我们在 0 到 135 之间时开始意图 Android

Start intent when pitch us between 0 and 135 Android

android

android-intent

android-sensors