[英]How to fix java.lang.RuntimeException on Android Studio?
我嘗試使用Firebase在一個具有TextView的應用程序中使用Firebase從我的設備中檢索注冊令牌,該應用程序每次在運行該應用程序時都會收到java.lang.RuntimeException錯誤,目的是在其中包含令牌的值,我添加了這段代碼FirebaseApp.initializeApp(this);
按照指示,但我仍然遇到這樣的錯誤,我對Android Studio和Firebase還是很陌生,並且仍在嘗試中。
MainActivity.java
package com.gci.gestioncapteursincendie;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.TextView;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.FirebaseApp;
import com.google.firebase.iid.FirebaseInstanceId;
import com.google.firebase.iid.InstanceIdResult;
public class MainActivity extends AppCompatActivity {
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FirebaseApp.initializeApp(this);
textView= findViewById(R.id.textViewToken);
FirebaseInstanceId.getInstance().getInstanceId()
.addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
@Override
public void onComplete(@NonNull Task<InstanceIdResult> task) {
if(task.isSuccessful()){
String token = task.getResult().getToken();
textView.setText("Token : " + token);
}
else
{
textView.setText("Token Not Generated");
}
}
});
}
}
日志跟蹤:
03-31 19:10:19.203 11562-11562/com.gci.gestioncapteursincendie E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.gci.gestioncapteursincendie, PID: 11562
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gci.gestioncapteursincendie/com.gci.gestioncapteursincendie.MainActivity}: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.gci.gestioncapteursincendie. Make sure to call FirebaseApp.initializeApp(Context) first.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3319)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415)
at android.app.ActivityThread.access$1100(ActivityThread.java:229)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7406)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.gci.gestioncapteursincendie. Make sure to call FirebaseApp.initializeApp(Context) first.
at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@16.0.1:219)
at com.google.firebase.iid.FirebaseInstanceId.getInstance(Unknown Source)
at com.gci.gestioncapteursincendie.MainActivity.onCreate(MainActivity.java:41)
at android.app.Activity.performCreate(Activity.java:6904)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3266)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415)
at android.app.ActivityThread.access$1100(ActivityThread.java:229)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7406)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
build.gradle
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
maven {
url 'https://maven.fabric.io/public'
}
}
dependencies {
classpath 'com.android.tools.build:gradle:3.3.2'
classpath 'com.google.gms:google-services:4.1.0'
classpath 'io.fabric.tools:gradle:1.26.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
從文檔:
對於絕大多數應用程序,
FirebaseInitProvider
會通過該應用程序的google-services.json
文件中包含的數據來處理其配置為要使用的默認項目的Firebase初始化。如果應用程序需要訪問默認項目以外的其他Firebase項目,則必須使用
initializeApp(Context, FirebaseOptions, String)
以編程方式創建該關系。
如果要在兩個不同的項目中使用此應用程序,則需要使用initializeApp()
。
https://firebase.google.com/docs/reference/android/com/google/firebase/FirebaseApp
還將您的Google服務版本更新為4.2.0
因為4.1.0
出現配置問題。
classpath 'com.google.gms:google-services:4.2.0'
在應用gradle的末尾添加應用插件:“ com.google.gms.google-services”:
dependencies {
classpath 'com.android.tools.build:gradle:3.3.2'
classpath 'com.google.gms:google-services:4.2.0'
...
}
apply plugin: 'com.google.gms.google-services'
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