Java 使用SensorEventListener注册SensorManager会在运行应用程序时引发ClassCastException
我正在尝试开发一个运动传感应用程序 为此，我创建了两个活动。Java 使用SensorEventListener注册SensorManager会在运行应用程序时引发ClassCastException,java,android,google-maps,Java,Android,Google Maps,我正在尝试开发一个运动传感应用程序 为此，我创建了两个活动。 第一个活动从用户处获取纬度和经度，并有一个按钮保存数据并将其传递到下一个活动。 第二个活动是GoogleMaps活动，我使用用户数据和所有相应的管理器（传感器管理器、加速计等） 第一页工作正常，但当我输入数据并按下按钮时，应用程序停止。 在日志中，它显示MapsActivity类中抛出了ClassCastException 请帮忙 错误： 12-21 17:14:44.564 5417-5417/com.example.anurag.
第一个活动从用户处获取纬度和经度，并有一个按钮保存数据并将其传递到下一个活动。
第二个活动是GoogleMaps活动，我使用用户数据和所有相应的管理器（传感器管理器、加速计等） 第一页工作正常，但当我输入数据并按下按钮时，应用程序停止。
在日志中，它显示MapsActivity类中抛出了ClassCastException 请帮忙 错误：
12-21 17:14:44.564 5417-5417/com.example.anurag.anurag_latest_morgenall E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.anurag.anurag_latest_morgenall, PID: 5417
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.anurag.anurag_latest_morgenall/com.example.anurag.anurag_latest_morgenall.MapsActivity}: java.lang.ClassCastException: com.example.anurag.anurag_latest_morgenall.MapsActivity cannot be cast to android.hardware.SensorEventListener
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.ClassCastException: com.example.anurag.anurag_latest_morgenall.MapsActivity cannot be cast to android.hardware.SensorEventListener
at com.example.anurag.anurag_latest_morgenall.MapsActivity.onCreate(MapsActivity.java:49)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
package com.example.anurag.anurag_latest_morgenall;
import android.app.usage.UsageEvents;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.appindexing.Thing;
import com.google.android.gms.common.api.GoogleApiClient;
public class MainActivity extends AppCompatActivity {
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
float x, y;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText latitude = (EditText) findViewById(R.id.latitude1);
final EditText longitude = (EditText) findViewById(R.id.longitude1);
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view){
x= Float.parseFloat(latitude.getText().toString());
y= Float.parseFloat(longitude.getText().toString());
Intent intent=new Intent(getApplicationContext(),MapsActivity.class);
Bundle extras= new Bundle();
extras.putFloat("LATITUDE",x);
extras.putFloat("LONGITUDE",y);
intent.putExtras(extras);
startActivity(intent);
}
});
}
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
public Action getIndexApiAction() {
Thing object = new Thing.Builder()
.setName("Main Page") // TODO: Define a title for the content shown.
// TODO: Make sure this auto-generated URL is correct.
.setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]"))
.build();
return new Action.Builder(Action.TYPE_VIEW)
.setObject(object)
.setActionStatus(Action.STATUS_TYPE_COMPLETED)
.build();
}
}
package com.example.anurag.anurag_latest_morgenall;
import android.content.Context;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.icu.text.SimpleDateFormat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import java.util.Date;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private SensorManager sensorManager;
private Sensor accelerometer;
long lastUpdate=0;
private float last_x,last_y;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
Intent intent = getIntent();
Bundle extras = intent.getExtras();
last_x = extras.getFloat("LATITUDE");
last_y = extras.getFloat("LONGITUDE");
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
// set up acclerometer
sensorManager= (SensorManager)this.getSystemService(Context.SENSOR_SERVICE);
accelerometer= sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
**the below line is where the error is getting pointed to**
sensorManager.registerListener((SensorEventListener) this,accelerometer,SensorManager.SENSOR_DELAY_NORMAL);
}
public void onSensorChanged(SensorEvent event){
Sensor mySensor= event.sensor;
if (mySensor.getType()==Sensor.TYPE_ACCELEROMETER)
{
float x= event.values[0];
float y= event.values[1];
long curTime= System.currentTimeMillis();
if(Math.abs(curTime - lastUpdate)>2000){
java.text.SimpleDateFormat date= new java.text.SimpleDateFormat("dd-MM-yyyy");
String currentDateTime= date.format(new Date());
lastUpdate=curTime;
if(Math.abs(last_x - x)>10)
{
mMap.addMarker(new MarkerOptions().position(new LatLng(last_x,last_y))
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE))
.title("Hey you moved the x-axis on "+currentDateTime));
}
if(Math.abs(last_y - y)>10)
{
mMap.addMarker(new MarkerOptions().position(new LatLng(last_x,last_y))
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN))
.title("Hey you moved the y-axis on "+currentDateTime));
}
last_x=x;
last_y=y;
}
}
}
public void onAccuracyChanged(Sensor sensor,int accuracy)
{
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(last_x,last_y);
mMap.addMarker(new MarkerOptions().position(sydney).title("Virginia Tech"));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney,14.9f));
}
}
package com.example.anurag.anurag_latest_morgenall;
import android.app.usage.UsageEvents;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.appindexing.Thing;
import com.google.android.gms.common.api.GoogleApiClient;
public class MainActivity extends AppCompatActivity {
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
float x, y;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText latitude = (EditText) findViewById(R.id.latitude1);
final EditText longitude = (EditText) findViewById(R.id.longitude1);
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view){
x= Float.parseFloat(latitude.getText().toString());
y= Float.parseFloat(longitude.getText().toString());
Intent intent=new Intent(getApplicationContext(),MapsActivity.class);
Bundle extras= new Bundle();
extras.putFloat("LATITUDE",x);
extras.putFloat("LONGITUDE",y);
intent.putExtras(extras);
startActivity(intent);
}
});
}
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
public Action getIndexApiAction() {
Thing object = new Thing.Builder()
.setName("Main Page") // TODO: Define a title for the content shown.
// TODO: Make sure this auto-generated URL is correct.
.setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]"))
.build();
return new Action.Builder(Action.TYPE_VIEW)
.setObject(object)
.setActionStatus(Action.STATUS_TYPE_COMPLETED)
.build();
}
}
package com.example.anurag.anurag_latest_morgenall;
import android.content.Context;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.icu.text.SimpleDateFormat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import java.util.Date;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private SensorManager sensorManager;
private Sensor accelerometer;
long lastUpdate=0;
private float last_x,last_y;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
Intent intent = getIntent();
Bundle extras = intent.getExtras();
last_x = extras.getFloat("LATITUDE");
last_y = extras.getFloat("LONGITUDE");
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
// set up acclerometer
sensorManager= (SensorManager)this.getSystemService(Context.SENSOR_SERVICE);
accelerometer= sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
**the below line is where the error is getting pointed to**
sensorManager.registerListener((SensorEventListener) this,accelerometer,SensorManager.SENSOR_DELAY_NORMAL);
}
public void onSensorChanged(SensorEvent event){
Sensor mySensor= event.sensor;
if (mySensor.getType()==Sensor.TYPE_ACCELEROMETER)
{
float x= event.values[0];
float y= event.values[1];
long curTime= System.currentTimeMillis();
if(Math.abs(curTime - lastUpdate)>2000){
java.text.SimpleDateFormat date= new java.text.SimpleDateFormat("dd-MM-yyyy");
String currentDateTime= date.format(new Date());
lastUpdate=curTime;
if(Math.abs(last_x - x)>10)
{
mMap.addMarker(new MarkerOptions().position(new LatLng(last_x,last_y))
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE))
.title("Hey you moved the x-axis on "+currentDateTime));
}
if(Math.abs(last_y - y)>10)
{
mMap.addMarker(new MarkerOptions().position(new LatLng(last_x,last_y))
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN))
.title("Hey you moved the y-axis on "+currentDateTime));
}
last_x=x;
last_y=y;
}
}
}
public void onAccuracyChanged(Sensor sensor,int accuracy)
{
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(last_x,last_y);
mMap.addMarker(new MarkerOptions().position(sydney).title("Virginia Tech"));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney,14.9f));
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.anurag.anurag_latest_morgenall.MainActivity">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/TextView1"
android:text="@string/Text_Name"
android:gravity="center_horizontal"
android:textSize="20sp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:layout_below="@+id/latitude1"
android:layout_alignEnd="@+id/latitude1"
android:layout_marginTop="33dp"
android:id="@+id/longitude1"
android:hint="Enter the longitude"
android:gravity="center_vertical|center" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:layout_marginTop="34dp"
android:id="@+id/latitude1"
android:hint="Enter the Latitude"
android:layout_below="@+id/TextView1"
android:layout_centerHorizontal="true"
android:gravity="center_vertical|center" />
<Button
android:text="Save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button1"
android:layout_below="@+id/longitude1"
android:layout_centerHorizontal="true"
android:layout_marginTop="71dp"
android:onClick="sendData"/>
</RelativeLayout>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.anurag.anurag_latest_morgenall.MapsActivity" />
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.anurag.anurag_latest_morgenall">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the 'MyLocation' functionality.
-->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COURSE_LOCATION"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!--
The API key for Google Maps-based APIs is defined as a string resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign the APK.
You need a different API key for each encryption key, including the release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in src/debug/ and src/release/.
-->
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
<activity
android:name=".MapsActivity"
android:label="@string/title_activity_maps"></activity><!-- ATTENTION: This was auto-generated to add Google Play services to your project for
App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information. -->
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
</manifest>
我已经在所需的位置输入了所有必要的API密钥。提示：这些方法不起任何作用
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