Android工作室的Firebase聊天應用程序

Question

在android studio中，我使用Fire-base創建了一個消息應用程序，但是當我啓動我的應用程序時，它顯示一個main_activity一秒鐘，然後顯示登錄頁面，當我成功登錄應用程序時崩潰我該怎麼辦，請幫助我我的代碼是完美的，我認爲有黑色的東西在我的清單請幫我解決這個問題..

這裏是明顯的CODE ...

<?xml version="1.0" encoding="utf-8"?> 
    <manifest xmlns:android="http://schemas.android.com/apk/res/android" 
     package="com.example.syedqadri.message"> 

    <uses-permission android:name="android.permission.INTERNET" /> 

     <application 
      android:allowBackup="true" 
      android:icon="@mipmap/ic_launcher_icon" 
      android:label="@string/app_name" 
      android:supportsRtl="true" 
      android:theme="@style/AppTheme"> 
      <activity android:name=".MainActivity"> 
       <intent-filter> 
        <action android:name="android.intent.action.MAIN" /> 

        <category android:name="android.intent.category.LAUNCHER" /> 
       </intent-filter> 
       </activity> 


     </application> 

    </manifest> 

這裏MY GRADLE（項目）

// Top-level build file where you can add configuration options common to all sub-projects/modules. 

buildscript { 
    repositories { 
     jcenter() 
    } 
    dependencies { 
     classpath 'com.android.tools.build:gradle:2.1.2' 
     classpath 'com.google.gms:google-services:3.1.0' 
     // NOTE: Do not place your application dependencies here; they belong 
     // in the individual module build.gradle files 
    } 
} 

allprojects { 
    repositories { 
     jcenter() 
    } 
} 

task clean(type: Delete) { 
    delete rootProject.buildDir 
} 

這裏是我的搖籃（APP）

apply plugin: 'com.android.application' 

android { 
    compileSdkVersion 25 
    buildToolsVersion "25.0.3" 

    defaultConfig { 
     applicationId "com.example.syedqadri.message" 
     minSdkVersion 23 
     targetSdkVersion 25 
     versionCode 1 
     versionName "1.0" 
     multiDexEnabled true 
    } 
    buildTypes { 
     release { 
      minifyEnabled true 
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 
     } 
    } 
} 

dependencies { 
    compile fileTree(include: ['*.jar'], dir: 'libs') 
    testCompile 'junit:junit:4.12' 
    compile 'com.android.support:appcompat-v7:25.3.1' 
    compile 'com.android.support:design:25.3.1' 
    compile 'com.firebaseui:firebase-ui:0.6.2' 



    // compile 'com.google.android.gms:play-services-location:9.2.0' 
    //compile 'com.google.firebase:firebase-core:9.2.0' 
    //compile 'com.google.firebase:firebase-auth:9.2.0' 
    //compile 'com.google.firebase:firebase-messaging:9.2.0' 
    // compile 'com.android.support:multidex:1.0.1' 

} 

apply plugin: 'com.google.gms.google-services' 

這裏是我的Java MainActivity.java

package com.example.syedqadri.message; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.annotation.NonNull; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.ListView; 
import android.widget.RelativeLayout; 
import android.widget.TextView; 
import android.text.format.DateFormat; 

import com.firebase.ui.auth.AuthUI; 
import com.firebase.ui.database.FirebaseListAdapter; 
import com.google.android.gms.tasks.OnCompleteListener; 
import com.google.android.gms.tasks.Task; 
import com.google.firebase.auth.FirebaseAuth; 
import com.google.firebase.database.FirebaseDatabase; 

public class MainActivity extends AppCompatActivity { 

    private static int SIGN_IN_REQUEST_CODE = 1; 
    private FirebaseListAdapter<chatmessage> adapter; 
    RelativeLayout activity_main; 
    FloatingActionButton sent; 


    @Override 
    public boolean onOptionsItemSelected(MenuItem item){ 

     if(item.getItemId() == R.id.menu_signout){ 
      AuthUI.getInstance().signOut(this).addOnCompleteListener(new OnCompleteListener<Void>(){ 

       @Override 
       public void onComplete(@NonNull Task<Void> task){ 

        Snackbar.make(activity_main, "You Have Been Sign Out", Snackbar.LENGTH_SHORT).show(); 
        finish(); 
       } 
      }); 
     } 
     return true; 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.main_menu,menu); 
     return true; 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data){ 
     super.onActivityResult(requestCode, resultCode, data); 
     if(requestCode == SIGN_IN_REQUEST_CODE){ 

      if(resultCode == RESULT_OK){ 
       Snackbar.make(activity_main, "Signing in SucessFully.Welcome ...",Snackbar.LENGTH_SHORT).show(); 
       displaychatmessage(); 

      } 
      else{ 
       Snackbar.make(activity_main, "Try Again Later ...",Snackbar.LENGTH_SHORT).show(); 
       finish(); 

      } 
     } 

    } 

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

     activity_main = (RelativeLayout)findViewById(R.id.activity_main); 
     sent = (FloatingActionButton)findViewById(R.id.sent); 
     sent.setOnClickListener(new View.OnClickListener(){ 


      @Override 
      public void onClick(View view) { 
       EditText input = (EditText)findViewById(R.id.input); 
       FirebaseDatabase.getInstance().getReference().push().setValue(new chatmessage(input.getText().toString(),FirebaseAuth.getInstance().getCurrentUser().getEmail())); 
       input.setText(""); 
       input.requestFocus(); 
       // displaychatmessage(); 
      } 
     }); 

     if(FirebaseAuth.getInstance().getCurrentUser() == null){ 
      startActivityForResult(AuthUI.getInstance().createSignInIntentBuilder().build(),SIGN_IN_REQUEST_CODE); 
     } 
     else{ 

      Snackbar.make(activity_main, "Welcome" +FirebaseAuth.getInstance().getCurrentUser().getEmail(),Snackbar.LENGTH_SHORT).show(); 
      displaychatmessage(); 
     } 
     //load content 
     displaychatmessage(); 
    } 

    private void displaychatmessage() { 

     ListView listOfMessage = (ListView)findViewById(R.id.lst_message); 
     adapter = new FirebaseListAdapter<chatmessage>(this,chatmessage.class,R.layout.list,FirebaseDatabase.getInstance().getReference()) { 


      @Override 
      protected void populateView(View v, chatmessage model, int position) { 
       //get reference to the list view items.xml 
       TextView messageText,messageUser,messageTime; 
       messageText = (TextView) v.findViewById(R.id.message_text); 
       messageUser = (TextView) v.findViewById(R.id.message_user); 
       messageTime = (TextView) v.findViewById(R.id.message_time); 

       messageText.setText(model.getMessaegeText()); 
       messageUser.setText(model.getMessageUser()); 
       messageTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)",model.getMessageTime())); 

      } 
     }; 

     listOfMessage.setAdapter(adapter); 
    } 
} 

這裏是我的Chatmessage.java

package com.example.syedqadri.message; 

import java.util.Date; 

/** 
* Created by Syed Qadri on 09-Jun-17. 
*/ 
public class chatmessage { 

    private String messaegeText; 
    private String messageUser; 
    private long messageTime; 

    public chatmessage(String messaegeText, String messageUser) { 
     this.messaegeText = messaegeText; 
     this.messageUser = messageUser; 

     messageTime = new Date().getTime(); 
    } 
    public chatmessage() { 
    } 
    public String getMessaegeText() { 
     return messaegeText; 
    } 

    public void setMessaegeText(String messaegeText) { 
     this.messaegeText = messaegeText; 
    } 

    public String getMessageUser() { 
     return messageUser; 
    } 

    public void setMessageUser(String messageUser) { 
     this.messageUser = messageUser; 
    } 

    public long getMessageTime() { 
     return messageTime; 
    } 

    public void setMessageTime(long messageTime) { 
     this.messageTime = messageTime; 
    } 
} 

Answer 1

嗯..我想你忘記在您的清單文件中添加Internet權限 將此行放在您的應用程序標記上方：

<uses-permission android:name="android.permission.INTERNET"/>