Question

在我的应用程序中，我想打开gps设置页面，如果没有启用它。为了在谷歌搜索时这样做，大多数人都说这段代码应该有用;

startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));

该代码打开此页面，

正如您在红色框中看到的，位置设置为ON。但是当我获得纬度和经度值时，它们返回null。然后我意识到我应该点击绿色框中的GPS按钮来启用GPS设置。但是我怎么能以编程方式呢？这意味着startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));无法打开实际的GPS设置。是因为我使用模拟器吗？见下文，我的GPS实际上没有启用。

有什么想法吗？提前致谢

Answer 1

只有在您想要位置设置页面时，您的代码才有效。现在有办法在不询问用户的情况下以编程方式打开GPS。我的一个工作中也遇到了这个问题，我找到了一个使用LocationServices.SettingsApi.checkLocationSettings的解决方案。现在我将尝试向您展示如何逐步使用它

假设您有一个按钮，当您点击此按钮时，您想要显示位置弹出窗口以启用GPS

enableGPS.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        showLocationEnableDialog();
    }
});

点击此按钮后，您应检查GoogleApiClient是否为空，如果为空，则应在showLocationEnableDialog()

创建实例

public void showLocationEnableDialog() {
if (googleApiClient == null) {
    googleApiClient = new GoogleApiClient.Builder(getActivity())
            .addApi(LocationServices.API)
            .build();
    googleApiClient.connect();

    createLocationRequest();
    PendingResult<LocationSettingsResult> result =
            LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());
    result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
        @Override
        public void onResult(LocationSettingsResult result) {
            setCallback(result);
        }
    });
}

}

您应该定义createLocationRequest()和setCallback()方法

private void createLocationRequest() {
    LocationRequest locationRequest = LocationRequest.create();
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    locationRequest.setInterval(10 * 1000);
    locationRequest.setFastestInterval(5 * 1000);
    builder = new LocationSettingsRequest.Builder()
            .addLocationRequest(locationRequest);
    builder.setAlwaysShow(true); //this is the key ingredient
}

private void setCallback(LocationSettingsResult result) {
final Status status = result.getStatus();
final LocationSettingsStates state = result.getLocationSettingsStates();
switch (status.getStatusCode()) {
    case LocationSettingsStatusCodes.SUCCESS:
        // All location settings are satisfied. The client can initialize location
        // requests here.
        break;
    case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
        // Location settings are not satisfied. But could be fixed by showing the user
        // a dialog.
        try {
            // Show the dialog by calling startResolutionForResult(),
            // and check the result in onActivityResult().
            status.startResolutionForResult(getActivity(), MainActivity.REQUEST_CHECK_SETTINGS);
        } catch (IntentSender.SendIntentException e) {
            // Ignore the error.
        }
        break;
    case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
        // Location settings are not satisfied. However, we have no way to fix the
        // settings so we won't show the dialog.               
        break;
    }
}

最后一步是抓住我们活动status.startResolutionForResult(getActivity(), MainActivity.REQUEST_CHECK_SETTINGS);上的onActivityResult。重要的是，我在片段中使用了这些代码，因此如果您在活动中使用此代码，则应将getActivity()替换为您的活动的上下文。此外REQUEST_CHECK_SETTINGS等于public static final int REQUEST_CHECK_SETTINGS = 0x1;

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    switch (requestCode) {
    // Check for the integer request code originally supplied to startResolutionForResult().
        case REQUEST_CHECK_SETTINGS: //int REQUEST_CHECK_SETTINGS = 0x1;
           switch (resultCode) {
               case Activity.RESULT_OK:
               //user enabled GPS, you can do your GPS operation here again
               break;
               case Activity.RESULT_CANCELED:
               // On pop-up user clicked cancel
               break;
           }
        break;
        }
}

打开GPS设置不起作用

1 个答案: