java - Android Activity 正在重新启动

Question

我正在制作一个应用程序，其中一个功能，用户位置每 10 秒更新一次。到目前为止，应用程序并未更新其位置，因为在检索位置之前 Activity 已暂停并重新启动。我不明白为什么要重新启动 Activity 。我最好的猜测是，由于没有发生很多事情，操作系统正在暂停 Activity ，但是什么会触发 Activity 重新启动？我之前尝试过构建应用程序，然后我从头开始重新启动，因为我犯了太多错误，但即便如此，我之前也没有遇到过这个问题。

D/selectRouteAndTransportMethod: On Start
D/myLocation: Connection Requested
D/selectRouteAndTransportMethod: Connecting
D/selectRouteAndTransportMethod: registered
D/myLocation: Connection Requested
V/FA: Activity resumed, time: 8562145
V/FA: Screen exposed for less than 1000 ms. Event not sent. time: 32
V/FA: Activity paused, time: 8562177
V/FA: onActivityCreated
D/Activity: performCreate Call secproduct feature valuefalse
D/Activity: performCreate Call debug elastic valuetrue
D/selectRouteAndTransportMethod: On Start
D/myLocation: Connection Requested
D/selectRouteAndTransportMethod: Connecting
D/selectRouteAndTransportMethod: registered
D/myLocation: Connection Requested
V/FA: Activity resumed, time: 8562374
D/myLocation: OnConnected
D/myLocation: Permission Was Granted
V/FA: Screen exposed for less than 1000 ms. Event not sent. time: 162
V/FA: Activity paused, time: 8562535
D/myLocation: OnConnected
D/myLocation: Permission Was Granted
V/FA: onActivityCreated
D/Activity: performCreate Call secproduct feature valuefalse
D/Activity: performCreate Call debug elastic valuetrue
D/selectRouteAndTransportMethod: On Start
D/myLocation: Connection Requested
D/selectRouteAndTransportMethod: Connecting
D/selectRouteAndTransportMethod: registered
V/FA: Activity resumed, time: 8562971
D/myLocation: Connection Requested
V/FA: Screen exposed for less than 1000 ms. Event not sent. time: 20
V/FA: Activity paused, time: 8562991
V/FA: onActivityCreated
D/Activity: performCreate Call secproduct feature valuefalse
D/Activity: performCreate Call debug elastic valuetrue
D/selectRouteAndTransportMethod: On Start
D/myLocation: Connection Requested
D/selectRouteAndTransportMethod: Connecting
D/selectRouteAndTransportMethod: registered
V/FA: Activity resumed, time: 8563169
D/myLocation: Connection Requested
D/myLocation: OnConnected
D/myLocation: Permission Was Granted
I/art: Background partial concurrent mark sweep GC freed 25697(1746KB) AllocSpace objects, 6(96KB) LOS objects, 33% free, 31MB/47MB, paused 3.173ms total 176.879ms
V/FA: Screen exposed for less than 1000 ms. Event not sent. time: 171
V/FA: Activity paused, time: 8563339
D/myLocation: OnConnected
D/myLocation: Permission Was Granted
V/FA: onActivityCreated
D/Activity: performCreate Call secproduct feature valuefalse
D/Activity: performCreate Call debug elastic valuetrue
D/selectRouteAndTransportMethod: On Start
D/myLocation: Connection Requested
D/selectRouteAndTransportMethod: Connecting
D/selectRouteAndTransportMethod: registered
V/FA: Activity resumed, time: 8563432
D/myLocation: Connection Requested
D/myLocation: OnConnected
D/myLocation: Permission Was Granted
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@21fc22ec time:3722364
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@39b2d053 time:3722365
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@2c7d74f4 time:3722366
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@14c588fb time:3722366
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@447b885 time:3722366
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@32c680a3 time:3722367
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@3948204 time:3722367
V/ActivityThread: updateVisibility : ActivityRecord{252a28bb token=android.os.BinderProxy@247ca0d3 {user.com.commuterapp/user.com.commuterapp.selectRouteAndTransportMethod}} show : false
V/ActivityThread: updateVisibility : ActivityRecord{26fe81d8 token=android.os.BinderProxy@3948204 {user.com.commuterapp/user.com.commuterapp.selectRouteAndTransportMethod}} show : false
V/ActivityThread: updateVisibility : ActivityRecord{2afd4931 token=android.os.BinderProxy@32c680a3 {user.com.commuterapp/user.com.commuterapp.selectRouteAndTransportMethod}} show : false
V/ActivityThread: updateVisibility : ActivityRecord{70b4816 token=android.os.BinderProxy@447b885 {user.com.commuterapp/user.com.commuterapp.selectRouteAndTransportMethod}} show : false
V/ActivityThread: updateVisibility : ActivityRecord{6c89597 token=android.os.BinderProxy@14c588fb {user.com.commuterapp/user.com.commuterapp.selectRouteAndTransportMethod}} show : false
V/ActivityThread: updateVisibility : ActivityRecord{ac5e384 token=android.os.BinderPr

这是我为自动更新位置所做的类:

    package user.com.commuterapp;

        import android.Manifest;

        import android.app.Activity;
        import android.app.PendingIntent;
        import android.content.Context;
        import android.support.annotation.NonNull;
        import android.support.annotation.Nullable;
        import android.support.v4.app.ActivityCompat;
        import android.os.Bundle;
        import android.content.pm.PackageManager;

        import com.google.android.gms.common.api.GoogleApiClient;
        import com.google.android.gms.location.LocationServices;
        import com.google.android.gms.location.LocationListener;
        import com.google.android.gms.location.LocationRequest;
        import com.google.android.gms.common.ConnectionResult;

        import android.location.Location;
        import android.content.IntentSender;

        import android.util.Log;
        import android.support.v4.content.ContextCompat;
        import android.content.Context;

        /**
         * Created by XXX XXXXX on 11/27/2016.
         *
         * Function: A simple interface that utilizes Google API CLient to update the users location
         * once every 15 seconds.  Used when the user wants the select his/her current location as his travel
         * origin.
         *
         * This class implements the Google API Client Connection Callbacks to async process successful connection requests
         * This class implements the Google API Client onConnectionFailedListener to async process failed connec

tion requests
     * This class implements the Google API Client onRequestPermissionResultCallback to async process user permission requests
     * for location updtaes
     */

    public class myLocation implements
            GoogleApiClient.ConnectionCallbacks,
            GoogleApiClient.OnConnectionFailedListener,
            ActivityCompat.OnRequestPermissionsResultCallback,
            LocationListener {
        private final static String TAG = "myLocation"; // for debugging purposes, to tell user the origin class for debug information
        private final static int MY_PERMISSION_ACCESS_FINE_LOCATION = 1;
        private final static long ONE_SECOND = 1000;
        private final static long UPDATE_INTERVAL = ONE_SECOND;
        private final static long FASTEST_UPDATE_INTERVAL = ONE_SECOND;

        public GoogleApiClient mGoogleApiClient = null;  //Google API Client object
        public Location mCurrentLocation; //current location of phone

        private Context mParentBase; //Global information on app environment from parent class to be used to create Google API Client Object
        private Activity mParentActivity; //Contains parent classes information on presentation layer
        private PendingIntent mParentIntent; //Passes on the rights to the application to another activity
        private LocationRequest requestLocation; //Object that contains auto location update paramaters

        /**
         * Constructor for my location, recieves calling classes Conxtext, Intent and Activity
         * Information
         *
         * @param Base
         * @param activitiyBase
         * @param intent
         */
        public myLocation(Context Base, Activity activitiyBase, PendingIntent intent) {
            mParentBase = Base;
            mParentActivity = activitiyBase;
            mParentIntent = intent;
            initialLocationService();
        }

        /**
         *  Public class to initiate connection to the API
         */
        public void connect() {
            mGoogleApiClient.connect();
            Log.d(TAG, "Connection Requested");
        }

        /**
         * Override public class from Google API Connection Callback,
         * Called when application has connected to the API.
         * @param bundle
         */

        @Override
        public void onConnected(@Nullable Bundle bundle) {

            Log.d(TAG, "OnConnected");

            if (PackageManager.PERMISSION_GRANTED ==
                    (ContextCompat.checkSelfPermission(mParentBase,
                            android.Manifest.permission.ACCESS_FINE_LOCATION)))

            {
                Log.d(TAG, "Permission Was Granted");
                //mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

                LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, requestLocation, mParentIntent);

                if (mCurrentLocation == null) {

                } else {
                    Log.d(TAG, mCurrentLocation.toString());
                }

            } else {
                ActivityCompat.requestPermissions(mParentActivity,
                        new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
                        MY_PERMISSION_ACCESS_FINE_LOCATION);
                Log.d(TAG, "Permission Was Requested");
            }
        }

        /**
         * Override from GoogleAPI connection override failed listener.  Used when the connection o the API
         * has failed
         * @param connectionResult
         */

        @Override
        public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
            Log.i(TAG, "Connection Failed");
            // just logging for now
        }

        /**
         * Not added, but will be used when permission to access phone location is not granted
         * @param requestCode
         * @param permissions
         * @param grantResults
         */
        @Override
        public void onRequestPermissionsResult(int requestCode,
                                               @NonNull String[] permissions, @NonNull int[] grantResults) {
            // loading from Android Studio, not going to worry about this now
        }

        @Override
        public void onConnectionSuspended(int i) {
            Log.i(TAG, "Connection Suspended");
            // just logging for now, not trying to resolve failure
        }

        /**
         * Callback for when a new location is recieved
         * @param location
         */

        @Override
        public void onLocationChanged(Location location) {
            Log.i(TAG, "Entered the onLocationChanged() method");
            // this calls one or the other private methods that don't
            //    matter to your problem.  I can post them if you like.
            if (location != null) {
                Log.d(TAG, location.toString());
                mCurrentLocation = location;
            } else {
                Log.d(TAG, "Can't get last location");

            }
        }

        /**
         * Initializes new Google API Client and Automatic Location Updates
         */

        private void initialLocationService() {
            if (mGoogleApiClient == null) {
                mGoogleApiClient = new GoogleApiClient.Builder(mParentBase)
                        .addConnectionCallbacks(this)
                        .addOnConnectionFailedListener(this)
                        .addApi(LocationServices.API)
                        .build();

                requestLocation = LocationRequest.create()
                        .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                        .setInterval(1 * 1000)        // 15 seconds, in milliseconds
                        .setFastestInterval(1 * 1000); // 15 second, in milliseconds
            }

        }

    }

这是主要的 Activity 代码:

package user.com.commuterapp;

import android.app.PendingIntent;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;


import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;

import user.com.commuterapp.R;

import static java.lang.Boolean.TRUE;

    public class selectRouteAndTransportMethod extends AppCompatActivity {

        Intent mIntent;
        PendingIntent mPendingIntent;
        myLocation mCurrentLocation;
        public static final String TAG = selectRouteAndTransportMethod.class.getSimpleName();
        /**
         * ATTENTION: This was auto-generated to implement the App Indexing API.
         * See https://g.co/AppIndexing/AndroidStudio for more information.
         */
        private GoogleApiClient client;

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

            mIntent = new Intent(this, selectRouteAndTransportMethod.class);
            mPendingIntent = PendingIntent.getActivity(this, 0, mIntent, 0);
            mCurrentLocation = new myLocation(this, this, mPendingIntent);
            // ATTENTION: This was auto-generated to implement the App Indexing API.

            // See https://g.co/AppIndexing/AndroidStudio for more information.

        }

        @Override
        protected void onStart() {
            super.onStart();

            Log.d(TAG, "On Start");

            mCurrentLocation.connect();

            boolean connecting = mCurrentLocation.mGoogleApiClient.isConnecting();
            boolean registered = mCurrentLocation.mGoogleApiClient.isConnectionCallbacksRegistered(mCurrentLocation);
                //ConnectionResult connectionResult = mCurrentLocation.mGoogleApiClient.getConnectionResult(LocationServices.API);

            if (connecting == TRUE) {
                Log.d(TAG, "Connecting");
                }

            if (registered == TRUE) {
                Log.d(TAG, "registered");
            }
        }

        @Override
        protected void onResume() {
            super.onResume();
            mCurrentLocation.connect();
        }

        @Override
        protected void onPause() {
            super.onPause();
         //   mCurrentLocation.disconnect();
        }

}

Answer 1

请求的权限是否包含在 list 中？

这是一个老问题，但是当我遇到同样的问题时我发现了它:

应用程序在无限循环中不断暂停和恢复，但不会抛出异常

就我而言，请求权限的行导致了问题。

ActivityCompat.requestPermissions(mParentActivity,
                        new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
                        MY_PERMISSION_ACCESS_FINE_LOCATION);

我正在请求 CALL_PHONE 权限，但已将其删除(因为我不再使用它)，但没有删除权限检查。两种可能的解决方案:

将请求的权限添加到 list 。

使用权限 android:name="android.permission.CALL_PHONE"

删除请求权限的行(当然，仅当您不再需要它时。)