Question

我在对话框片段中使用了firebase数据库。当下面的代码运行时它会崩溃

private FirebaseDatabase firebaseDatabase=FirebaseDatabase.getInstance();

我搜索了所有解决方案，例如更改gradle依赖项并下载google-service.json文件

等等，但问题尚未解决。我附上我的代码的所有细节请给出正确的解决方案。感谢

public class FireViewFragment extends DialogFragment {

TextView name, email, username;
Button ok;
MyDialogInterface myDialogInterface;
private FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();

public FireViewFragment(MyDialogInterface myDialogInterface) {
    this.myDialogInterface = myDialogInterface;
    Log.d("Interface", "Constractor");
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_fire_view, container, false);
    name = (TextView) view.findViewById(R.id.dis_name);
    email = (TextView) view.findViewById(R.id.dis_email);
    username = (TextView) view.findViewById(R.id.dis_uname);
    ok = (Button) view.findViewById(R.id.ok);
    ok.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            myDialogInterface.setMyDialogInterface("hi", false);

        }
    });
    return view;
}}

的build.gradle（Module.app）

dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
})
compile('com.crashlytics.sdk.android:crashlytics:2.6.7@aar') {
    transitive = true;
}
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:recyclerview-v7:25.3.1'
compile 'com.google.android.gms:play-services-maps:10.2.1'
compile 'com.android.support:support-v4:25.3.1'
compile 'com.google.firebase:firebase-database:9.2.0'
testCompile 'junit:junit:4.12'

}应用插件：＆＃39; com.google.gms.google-services＆＃39;

google-service.json文件

  "project_info": {
"project_number": "961599319300",
"firebase_url": "https://working-2ab0d.firebaseio.com",
"project_id": "working-2ab0d",
"storage_bucket": "working-2ab0d.appspot.com"  },

logcat的

05-01 21:56:30.298 29506-29506/com.example.gowsik.working E/AndroidRuntime: FATAL EXCEPTION: main
                                                                        Process: com.example.gowsik.working, PID: 29506
                                                                        java.lang.NoSuchMethodError: No virtual method zzckb()Z in class Lcom/google/firebase/FirebaseApp; or its super classes (declaration of 'com.google.firebase.FirebaseApp' appears in /data/app/com.example.gowsik.working-1/split_lib_dependencies_apk.apk)
                                                                            at com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source)
                                                                            at com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source)
                                                                            at com.example.gowsik.working.firebase.FireViewFragment.<init>(FireViewFragment.java:22)
                                                                            at com.example.gowsik.working.activities.FirebaseActivity$2.onClick(FirebaseActivity.java:49)
                                                                            at android.view.View.performClick(View.java:4780)
                                                                            at android.view.View$PerformClick.run(View.java:19866)
                                                                            at android.os.Handler.handleCallback(Handler.java:739)
                                                                            at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                            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)

Answer 1

而不是写

private FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();

写

private DatabaseReference firebaseDatabase = FirebaseDatabase.getInstance();

希望这能解决您的问题

Answer 2

不同版本的Google图书馆无法协同工作。您需要添加相同的版本，因此将地图库更改为9.2.0：

<?php

$link = mysqli_connect("localhost", "root", "", "applicationfestival");

// Check connection
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}

// Attempt delete query execution
$sql = " DELETE FROM billet WHERE id= $id ";

if(mysqli_query($link, $sql)){
    echo "Records were deleted successfully.";
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}

// Close connection
mysqli_close($link);
?>

Answer 3

问题解决了我只使用了相同版本的google-play-service和firebase依赖

 compile 'com.google.android.gms:play-services-maps:9.2.0'
 compile 'com.google.firebase:firebase-database:9.2.0'

FirebaseDatabase.getInstance（）崩溃了

3 个答案: