Android 需要启用GPS时如何构造代码

如果启用GPS，我的代码可以正常工作，但当需要启用GPS时，它会强制崩溃。当GPS未启用时，与尝试获取位置有关。我试图为用户打开设置以启用GPS，但它只是继续尝试记录GPS，因此强制崩溃

我不知道何时何地给梅因打电话

第一种设置称为：

public class StartupSettings extends Activity{
    boolean hasGps = false;
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.startup_dialog);
        checkGPS();
    }

    public void checkGPS()
    {
        LocationHandler2 lh = new LocationHandler2();

        hasGps = lh.enableGPS(this);


        if (hasGps == true)
        {
            TextView tv = (TextView) findViewById(R.id.checkGPSConnection);
            tv.setTextColor(Color.GREEN);
        }


    }

上述StartUpSettings活动调用的enableGPS方法：

然后我想调用Main，它启动一个名为StartProcess的异步任务

StartProcess异步任务：

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小姐，我不知道你有什么问题，但我做了这个GPS教程，它工作正常，没有崩溃。对于教程，我不知道具体是哪一个，它们应该略高于100。你必须找到GPS的教程，这是30分钟的教程。我希望是这样？

我最终将enableGPS方法移动到我的StartupSettings活动中，然后在用户启用GPS时使用startActivityForResult启动Main

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不确定这是否理想但已解决

您的GPSProvider=null，是否签入真实设备我知道它为null。但关键是，尽管我试图让用户启用GPS，代码仍在执行AsyncTask，即当用户试图启用GPS时，正在执行调用AsyncTask的Main。我不知道如何重新构造它，以便它等待用户完成启用GPS。我认为GPS LocationManager有类似ONGPEnabled的方法。。。。

public class LocationHandler2{
    LocationManager mlocManager;

    public boolean enableGPS(final StartupSettings main)
    {    
        mlocManager = (LocationManager)main.getSystemService(Context.LOCATION_SERVICE);
        if(!mlocManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
            //Ask the user to enable GPS
            AlertDialog.Builder builder = new AlertDialog.Builder(main);
            builder.setTitle("Location Manager");
            builder.setMessage("Would you like to enable GPS?");
            builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    //Launch settings, allowing user to make a change
                    Intent i = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                    main.startActivity(i);
                }
            });
            builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    //No location service, no Activity

                    main.finish();
                }
            });
            builder.create().show();
        }   
        else
        {
            return true;
        }
        return true;
    }

public class Main extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.pages);


        StartProcess sProcess = new StartProcess();
        sProcess.execute(this);
    }  

public class StartProcess extends AsyncTask<Main, Void, Void>
{
    @Override
    protected Void doInBackground(Main... params) {


        LocationHandler2 lh = new LocationHandler2();
        try {
            lh.getLocationStartEnd(params[0],0);
        } 
        catch (InterruptedException e) {
            e.printStackTrace();
        }
        return null;
    }


}

02-26 17:33:31.264: E/AndroidRuntime(10560): FATAL EXCEPTION: AsyncTask #1
02-26 17:33:31.264: E/AndroidRuntime(10560): java.lang.RuntimeException: An error occured while executing doInBackground()
02-26 17:33:31.264: E/AndroidRuntime(10560):    at android.os.AsyncTask$3.done(AsyncTask.java:200)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at java.lang.Thread.run(Thread.java:1096)
02-26 17:33:31.264: E/AndroidRuntime(10560): Caused by: java.lang.IllegalArgumentException: provider==null
02-26 17:33:31.264: E/AndroidRuntime(10560):    at android.location.LocationManager.requestLocationUpdates(LocationManager.java:653)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at mfc.generalguixapi8.LocationHandler2.getLocationStartEnd(LocationHandler2.java:120)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at mfc.generalguixapi8.StartProcess.doInBackground(StartProcess.java:13)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at mfc.generalguixapi8.StartProcess.doInBackground(StartProcess.java:1)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at android.os.AsyncTask$2.call(AsyncTask.java:185)
02-26 17:33:31.264: E/AndroidRuntime(10560):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
02-26 17:33:31.264: E/AndroidRuntime(10560):    ... 4 more
02-26 17:34:37.694: E/global(10620): Deprecated Thread methods are not supported.
02-26 17:34:37.694: E/global(10620): java.lang.UnsupportedOperationException
02-26 17:34:37.694: E/global(10620):    at java.lang.VMThread.stop(VMThread.java:85)
02-26 17:34:37.694: E/global(10620):    at java.lang.Thread.stop(Thread.java:1379)
02-26 17:34:37.694: E/global(10620):    at java.lang.Thread.stop(Thread.java:1344)
02-26 17:34:37.694: E/global(10620):    at mfc.generalguixapi8.SplashScreen$1.run(SplashScreen.java:36)
02-26 17:36:18.134: E/global(10713): Deprecated Thread methods are not supported.
02-26 17:36:18.134: E/global(10713): java.lang.UnsupportedOperationException
02-26 17:36:18.134: E/global(10713):    at java.lang.VMThread.stop(VMThread.java:85)
02-26 17:36:18.134: E/global(10713):    at java.lang.Thread.stop(Thread.java:1379)
02-26 17:36:18.134: E/global(10713):    at java.lang.Thread.stop(Thread.java:1344)
02-26 17:36:18.134: E/global(10713):    at mfc.generalguixapi8.SplashScreen$1.run(SplashScreen.java:36)