做一个没有视图的零食吧?

I want to show a snackbar as soon as the user opens the Google Maps activity, but the thing is that there's no views in the activity to use as the first parameter of the activity (in the findViewById() of Snackbar.make()). What do I put there? Here's the java class code:

当用户打开谷歌映射活动时，我希望显示一个snackbar，但事情是在活动中没有视图作为活动的第一个参数(在snackbar .make()的findViewById()中)。我在那里放了什么?下面是java类代码:

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

private GoogleMap mMap;

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

    // 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);
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    mMap.setBuildingsEnabled(true);
    mMap.getUiSettings().setZoomControlsEnabled(true);
    float cameraZoom = 17;
    LatLng location = new LatLng(43.404032, -80.478184);
    mMap.addMarker(new MarkerOptions().position(location).title("49 McIntyre Place #18, Kitchener, ON N2R 1G3"));
    CameraUpdateFactory.newLatLngZoom(location, cameraZoom);
    Snackbar.make(findViewById(/*WHAT DO I PUT HERE?*/), "Click the pin for more options", Snackbar.LENGTH_LONG).show();
}
}

Also, here is the activity xml code:

此外，这里是活动xml代码:

<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="ca.davesautoservice.davesautoservice.MapsActivity" />

And lastly, here's the stacktrace error:

最后，这是stacktrace错误:

08-03 11:42:21.333 3901-3901/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: ca.davesautoservice.davesautoservice, PID: 3901
    java.lang.NullPointerException
        at android.support.design.widget.Snackbar.<init>(Snackbar.java:183)
        at android.support.design.widget.Snackbar.make(Snackbar.java:215)
        at ca.davesautoservice.davesautoservice.MapsActivity.onMapReady(MapsActivity.java:48)
        at com.google.android.gms.maps.SupportMapFragment$zza$1.zza(Unknown Source)
        at com.google.android.gms.maps.internal.zzo$zza.onTransact(Unknown Source)
        at android.os.Binder.transact(Binder.java:361)
        at xz.a(:com.google.android.gms.DynamiteModulesB:82)
        at maps.ad.u$5.run(Unknown Source)
        at android.os.Handler.handleCallback(Handler.java:808)
        at android.os.Handler.dispatchMessage(Handler.java:103)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:5333)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
        at dalvik.system.NativeStart.main(Native Method)

Thanks for the help! :)

谢谢你的帮助!:)

2 个解决方案

#1

I see some options... Not sure which one can fix your issue.

我看到一些选项…不知道哪一个可以解决你的问题。

Simpliest

简单的

SupportMapFragment extends class android.support.v4.app.Fragment. This way, it has a method getView()

android.support.v4.app.Fragment SupportMapFragment扩展类。这样，它有一个getView()方法

Snackbar.make(mapFragment.getView(), "Click the pin for more options", Snackbar.LENGTH_LONG).show();

Find Root View

找到根视图

From this answer, there's a way to get the root view via:

根据这个答案，有一种方法可以通过:

getWindow().getDecorView().getRootView()

So, maybe, you can do:

所以，也许你可以这样做:

Snackbar.make(getWindow().getDecorView().getRootView(), "Click the pin for more options", Snackbar.LENGTH_LONG).show();

Add a dummy LinearLayout to get the View

添加一个虚拟的线性布局来获取视图

Honestly, I'm not sure if this solution is possible. I'm not sure if you can add a LinearLayout above the Maps fragment... I think it is OK but since I never work with Maps API before, I'm not sure.

老实说，我不确定这个解决方案是否可行。我不确定你是否可以在地图片段上面添加一个线性布局……我认为这是可以的，但是因为我以前从未使用过Maps API，所以我不确定。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/dummy_layout_for_snackbar"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <fragment 
        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="ca.davesautoservice.davesautoservice.MapsActivity" />
</LinearLayout>

and then:

然后:

Snackbar.make(findViewById(R.id.dummy_layout_for_snackbar), "Click the pin for more options", Snackbar.LENGTH_LONG).show();

2 个解决方案

#1

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