在Android工作室我使用Fire-base创建一个消息传递应用程序，但当我启动我的应用程序时，它显示一个main_activity一秒钟，然后显示登录页面，当我成功登录应用程序崩溃我该怎么办请帮助我的代码是完美的我认为我的清单中有黑色的东西请帮助我解决这个问题..
这是最清晰的代码......
<?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>
这是我的毕业生（项目）
// 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
}
这是我的Gradle（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'
这是我的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);
}
}
这是我的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;
}
}
答案 0 :(得分：0)
嗯..我想您忘了在清单文件中添加 Internet权限 将此行放在您的应用程序标记上方：
<uses-permission android:name="android.permission.INTERNET"/>