切换到firebase-应用程序的活动关闭 [英] Switching Activity to firebase- app shuts down
问题描述
当用户点击MainActivity中的一个链接时，我有一个问题切换活动，应用程序将关闭，我不知道如果我有项目结构的问题或正确声明类和扩展。 / p>
基本上我所做的就是尝试将网站上提供的Firebase示例项目合并到我的应用中的一个活动中，以便让成员登录，我把最初的代码分成了这里并在我的第二个活动窗口中实现它，链接中的代码是MainActivity，我希望它作为LoginFragment（只有一个名称）没有使用片段。
因此，在最小化代码（删除谷歌，Facebook等）选项后，我结束了这个：
package net.we4x4.we4x4;
导入android.app.AlertDialog;
导入android.app.Application;
导入android.app.ProgressDialog;
导入android.content.Intent;
导入android.os.Bundle;
导入android.support.v7.app.AppCompatActivity;
导入android.util.Log;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.view.View;
导入android.widget.Button;
导入android.widget.TextView;
import com.firebase.client.AuthData;
import com.firebase.client.Firebase;
import com.firebase.client.FirebaseError;
import java.util.HashMap;
import java.util.Map;
public class LoginFragment extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName（）;
/ * *************************************
*一般*
*************************************** /
/ * TextView用于显示登录用户的信息* /
private TextView mLoggedInStatusTextView;
/ *在Firebase身份验证完成之前显示的对话框。 * /
私人ProgressDialog mAuthProgressDialog;
/ *引用Firebase * /
私有Firebase mFirebaseRef;
/ *来自认证用户的数据* /
private AuthData mAuthData;
/ * Firebase会话更改的监听器* /
私有Firebase.AuthStateListener mAuthStateListener;
/ * *************************************
*密码*
*************************************** /
私人按钮mPasswordLoginButton;
/ * *************************************
* ANONYMOUSLY *
*************************************** /
私人按钮mAnonymousLoginButton;
@Override
protected void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
/ *加载视图并显示它* /
setContentView（R.layout.activity_main）;
/ * *************************************
*密码*
*************************************** /
mPasswordLoginButton =（Button）findViewById（R.id.login_with_password）;
mPasswordLoginButton.setOnClickListener（new View.OnClickListener（）{
@Override
public void onClick（View view）{
loginWithPassword（）;
}
}）;
/ * *************************************
* ANONYMOUSLY *
*************************************** /
/ *加载并设置匿名登录按钮* /
mAnonymousLoginButton =（Button）findViewById（R.id.login_anonymously）;
mAnonymousLoginButton.setOnClickListener（new View.OnClickListener（）{
@Override
public void onClick（View view）{
loginAnonymously（）;
}
}）;
/ * *************************************
*一般*
*************************************** /
mLoggedInStatusTextView =（TextView）findViewById（R.id.login_status）;
$ b $ *创建用于Firebase * /
的所有身份验证的Firebase引用mFirebaseRef = new Firebase（getResources（）。getString（R.string.firebase_url））;
$ b $ *设置稍后使用Firebase进行身份验证时显示的进度对话框* /
mAuthProgressDialog = new ProgressDialog（this）;
mAuthProgressDialog.setTitle（Loading）;
mAuthProgressDialog.setMessage（使用Firebase进行身份验证...）;
mAuthProgressDialog.setCancelable（false）;
mAuthProgressDialog.show（）;
mAuthStateListener = new Firebase.AuthStateListener（）{
@Override
public void onAuthStateChanged（AuthData authData）{
mAuthProgressDialog.hide（）;
setAuthenticatedUser（authData）;
}
};
/ *检查用户是否已经使用Firebase进行身份验证。如果是这种情况，我们可以设置认证的
*用户并隐藏任何登录按钮* /
mFirebaseRef.addAuthStateListener（mAuthStateListener）;
@Override
protected void onDestroy（）{
super.onDestroy（）;
//如果更改配置，请停止跟踪Firebase会话。
mFirebaseRef.removeAuthStateListener（mAuthStateListener）;
}
/ **
*此方法在任何startActivityForResult完成时触发。 requestCode映射到
*传递给startActivityForResult的值。
* /
@Override
public void onActivityResult（int requestCode，int resultCode，Intent data）{
super.onActivityResult（requestCode，resultCode，data）;
Map< String，String> options = new HashMap< String，String>（）;
$覆盖
public boolean onCreateOptionsMenu（菜单菜单）{
/ *如果用户当前已被认证，显示一个注销菜单* /
if（this.mAuthData！= null）{
getMenuInflater（）。inflate（R.menu.main，menu）;
返回true;
} else {
return false;
$ b $ @覆盖
public boolean onOptionsItemSelected（MenuItem item）{
int id = item.getItemId（）;
if（id == R.id.action_logout）{
logout（）;
返回true;
}
return super.onOptionsItemSelected（item）;
}
/ **
*如果有必要，请从Firebase和提供商处取消验证。
* /
private void logout（）{
if（this.mAuthData！= null）{
/ * Firebase * / $ b $注销mFirebaseRef.unauth（） ;
}
/ *更新认证用户并显示登录按钮* /
setAuthenticatedUser（null）;
$ b / **
*这个方法将尝试认证一个用户firebase给定一个oauth_token（和其他
*必要的参数取决于提供者）
* /
private void authWithFirebase（final String提供者，Map< String，String>选项）{
if（options.containsKey（error））{
showErrorDialog（options.get（ 错误））;
} else {
mAuthProgressDialog.show（）;
if（provider.equals（twitter））{
//如果提供者是twitter，我们会传入其他选项，所以使用选项端点
mFirebaseRef.authWithOAuthToken（provider，选项，新的AuthResultHandler（provider））;
} else {
//如果提供者不是twitter，我们只需要传入oauth_token
mFirebaseRef.authWithOAuthToken（provider，options.get（oauth_token），new AuthResultHandler提供商））;
$ b $ ** b $ b *一旦用户登录，从Firebase提供的mAuthData中使用它。
* /
private void setAuthenticatedUser（AuthData authData）{
if（authData！= null）{
/ *隐藏所有登录按钮* /
mPasswordLoginButton.setVisibility （View.GONE）;
mAnonymousLoginButton.setVisibility（View.GONE）;
mLoggedInStatusTextView.setVisibility（View.VISIBLE）;
/ *显示提供商特定状态文本* /
字符串名称= null;
if（authData.getProvider（）。equals（facebook）
|| authData.getProvider（）。equals（google）
|| authData.getProvider（）。equals twitter））{
name =（String）authData.getProviderData（）。get（displayName）;
} else if（authData.getProvider（）。equals（anonymous）
|| authData.getProvider（）。equals（password））{
name = authData.getUid（ ）;
} else {
Log.e（TAG，Invalid provider：+ authData.getProvider（））;
}
if（name！= null）{
mLoggedInStatusTextView.setText（Logged in+ name +（+ authData.getProvider（）+））;
} else {
/ *没有经过身份验证的用户显示所有登录按钮* /
mPasswordLoginButton.setVisibility（View.VISIBLE）;
mAnonymousLoginButton.setVisibility（View.VISIBLE）;
mLoggedInStatusTextView.setVisibility（View.GONE）;
}
this.mAuthData = authData;
/ *无效选项菜单隐藏/显示注销按钮* /
supportInvalidateOptionsMenu（）;
$ b / **
*向用户显示错误
* /
private void showErrorDialog（String message） {
AlertDialog.Builder（this）
.setTitle（Error）
.setMessage（message）
.setPositiveButton（android.R.string.ok，null）
.setIcon（android.R.drawable.ic_dialog_alert）
.show（）;
$ b $ **
*认证结果的工具类
* /
private class AuthResultHandler实现了Firebase.AuthResultHandler {
private final String提供者;
public AuthResultHandler（String provider）{
this.provider = provider;
}
@Override
public void onAuthenticated（AuthData authData）{
mAuthProgressDialog.hide（）;
Log.i（TAG，provider +auth successful）;
setAuthenticatedUser（authData）;
$ b $ @覆盖
public void onAuthenticationError（FirebaseError firebaseError）{
mAuthProgressDialog.hide（）;
showErrorDialog（firebaseError.toString（））;
}
}
/ * ****************************** ******
*密码*
********************************* *****
* /
public void loginWithPassword（）{
mAuthProgressDialog.show（）;
mFirebaseRef.authWithPassword（test@firebaseuser.com，test1234，new AuthResultHandler（password））;
}
/ * *********************************** *
* ANONYMOUSLY *
**************************************
* /
private void loginAnonymously（）{
mAuthProgressDialog.show（）;
mFirebaseRef.authAnonymously（new AuthResultHandler（anonymous））;
$ b public void switchToRegister（View v）{
Intent Register = new Intent（this，Register.class）;
startActivity（Register）;
$ b $ / code $ / pre
声明该类为公共和扩展AppCompatActivity（不知道我刚刚从另一个教程中学到了什么，我也试图扩展它从应用程序，我认为可以工作，但随后各种错误在列出的代码：
$ p $ <？xml version = 1.0encoding =utf-8？>
< uses-permission android：name =android.permission.INTERNET/>
<使用权限android：name =android.permission.ACCESS_NETWORK_STATE/>
<使用权限android：name =android.permission.ACCESS_WIFI_STATE/>
< uses-permission android：name =android.permission.GET_ACCOUNTS/>
< uses-permission android：name =android.permission.USE_CREDENTIALS/>
应用程序$ b $ android：allowBackup =true
android：icon =@ mipmap / ic_launcher
android：label =@ string / app_name
android：supportsRtl =true
android：theme =@ style / AppTheme>
android：label =@ string / app_name>
< intent-filter>
< category android：name =android.intent.category.LAUNCHER/>
< / intent-filter>
< / activity>
< activity android：name =。LoginFragment>
< / activity>
< activity android：name =。Register>
< / activity>
<！ - 注意：这是自动生成的，可以将Google Play服务添加到您的项目中，作为
App Indexing。有关更多信息，请参阅https://g.co/AppIndexing/AndroidStudio。 - >
< meta-data
android：name =com.google.android.gms.version
android：value =@ integer / google_play_services_version/>
< / application>
在第27行下.LoginFragment它说它不能分配给android.app.activity？
然后在代码本身LoginFragment：
我得到这些我不能解决的错误：
第58行 - setContentView不能解决这个方法？
setContentView（R.layout.fragment_login）;
第63行findViewById也不能解析这个方法？
pre> mPasswordLoginButton =（Button）findViewById（R.id.login_with_password）;
同一个匿名选项75
mAnonymousLoginButton =（Button）findViewById（R.id。 login_anonymously）;
第86行findViewById同样的问题？
mLoggedInStatusTextView =（TextView）findViewById（R.id.login_status）;
显然我需要创建findViewById mehtod如果我想扩展应用程序，但我做了不要继续，因为我不知道我是否应该从应用程序扩展，考虑到我没有得到这些代码中的任何错误，当我从MainActivity或AppCompatActivity延伸
还有我得到行114不能解决这个方法
super.onDestroy（）;
和其他几个....？$ / b
$ b
所以我不知道如何解决这个问题？我应该扩展应用程序和解决这些错误（以及如何解决这些错误），或保持MainActivity或AppCompatActivity的扩展？在代码中不包含错误，但不能正常工作切换活动：
我的MainActivity是：
package net.we4x4.we4x4;
导入android.content.Intent;
导入android.net.Uri;
导入android.os.Bundle;
导入android.support.v7.app.AppCompatActivity;
导入android.view.View;
导入android.widget.MediaController;
导入android.widget.VideoView;
import com.firebase.client.Firebase;
public class MainActivity extends AppCompatActivity {
public static final String VID_URL =http://res.cloudinary.com/wi4x4/video/upload/v1457270321/bolivia_njb6r0.mp4;
@Override
protected void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.activity_main）;
if（savedInstanceState == null）{
Firebase.setAndroidContext（this）;
VideoView vid =（VideoView）findViewById（R。id.VidClip）;
Uri video = Uri.parse（VID_URL）;
vid.setMediaController（new MediaController（this））;
vid.setVideoURI（video）;
vid.requestFocus（）;
public void switchToLoginFragment（View v）{
Intent LoginFragment = new Intent（this， LoginFragment.class）;
startActivity（LoginFragment）;
}
public void switchToRegister（View v）{
Intent Register = new Intent（this，Register.class）;
startActivity（Register）;
code
$ b $ p
$ b 错误日志是：
6:16:51 PM AssertionError：错误的元素范围PsiJavaFile：LoginFragment.java; commit = true
android监视器：
03-07 18：19：52.512 21730-21730 / net.we4x4.we4x4 E / AndroidRuntime：致命例外：main
过程：net.we4x4.we4x4，PID：21730
java.lang.RuntimeException：无法启动活动ComponentInfo {net.we4x4.we4x4 / net.we4x4.we4x4.LoginFragment}：java.lang.IllegalStateException：对于自定义Firebase主机，您必须先使用之前设置您的身份验证服务器认证功能！
at android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2429）
at android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2493）
at android.app.ActivityThread.access $ 800（ActivityThread.java:166）
at android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1283）
at android.os.Handler.dispatchMessage（Handler.java:102）
at android.os.Looper.loop（Looper.java:136）
at android.app.ActivityThread.main（ActivityThread.java:5584）
（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:1268）
at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1084）
at dalvik.system.NativeStart.main（Native Method）
导致：java.lang.IllegalStateException：对于自定义的Firebase主机，您必须先使用身份验证功能才能设置您的身份验证服务器！
at com.firebase.client.authentication.AuthenticationManager.checkServerSettings（AuthenticationManager.java:221）
at com.firebase.client.authentication.AuthenticationManager.addAuthStateListener（AuthenticationManager.java:625）
at.firebase.addAuthStateListener（Firebase.java:555）
at net.we4x4.we4x4.LoginFragment.onCreate（LoginFragment.java:107）
at android.app.Activity.performCreate （Activity.java:5447）
在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1094）
在android .app.ActivityThread.performLaunchActivity（ActivityThread.java:2393）
at android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2493）
at android.app.ActivityThread.access $ 800（ActivityThread.java： 166）
在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1283）
在android.os.Handler.dispatchMessage（Handler.java:102）
在android.os .Looper.loop（Looper.java:136）
at android.app.ActivityThread.main（ActivityThread.java:5584）
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:1268）
at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1084）
at dalvik.system.NativeStart.main（Native Method）
这个例外：
解决方案 .lang.RuntimeException：无法启动活动ComponentInfo {net.we4x4.we4x4 / net.we4x4.we4x4.we4x4.LoginFragment}：java.lang.IllegalStateException：对于自定义Firebase主机，您必须先使用身份验证功能设置您的身份验证服务器！ / p>
来自这行：
m FirebaseRef = new Firebase（getResources（）。getString（R.string.firebase_url））;
原因是 firebase_url 的格式不是 https://yours.firebaseio.com 。
I have a problem switching activity when a user would click on a link from MainActivity, the app will just shut down, i am not sure if i have a problem with the project structure or declaring the class correctly and the extends.
Basically what i did is try to implement Firebase example project provided on the website into one activity i have in my app, in order to have a way to let members log in, i striped down the initial code provided here and implemented it in my second activity window, the code in the link is for the MainActivity and i wanted it to be as LoginFragment ( only a name ) didnt use fragments.
thus after minimizing the code ( deleting google, facebook, etc ) options i ended up with this :
package net.we4x4.we4x4;
import android.app.AlertDialog;
import android.app.Application;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.firebase.client.AuthData;
import com.firebase.client.Firebase;
import com.firebase.client.FirebaseError;
import java.util.HashMap;
import java.util.Map;
public class LoginFragment extends AppCompatActivity{
private static final String TAG = MainActivity.class.getSimpleName();
/* *************************************
* GENERAL *
***************************************/
/* TextView that is used to display information about the logged in user */
private TextView mLoggedInStatusTextView;
/* A dialog that is presented until the Firebase authentication finished. */
private ProgressDialog mAuthProgressDialog;
/* A reference to the Firebase */
private Firebase mFirebaseRef;
/* Data from the authenticated user */
private AuthData mAuthData;
/* Listener for Firebase session changes */
private Firebase.AuthStateListener mAuthStateListener;
/* *************************************
* PASSWORD *
***************************************/
private Button mPasswordLoginButton;
/* *************************************
* ANONYMOUSLY *
***************************************/
private Button mAnonymousLoginButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/* Load the view and display it */
setContentView(R.layout.activity_main);
/* *************************************
* PASSWORD *
***************************************/
mPasswordLoginButton = (Button) findViewById(R.id.login_with_password);
mPasswordLoginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
loginWithPassword();
}
});
/* *************************************
* ANONYMOUSLY *
***************************************/
/* Load and setup the anonymous login button */
mAnonymousLoginButton = (Button) findViewById(R.id.login_anonymously);
mAnonymousLoginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
loginAnonymously();
}
});
/* *************************************
* GENERAL *
***************************************/
mLoggedInStatusTextView = (TextView) findViewById(R.id.login_status);
/* Create the Firebase ref that is used for all authentication with Firebase */
mFirebaseRef = new Firebase(getResources().getString(R.string.firebase_url));
/* Setup the progress dialog that is displayed later when authenticating with Firebase */
mAuthProgressDialog = new ProgressDialog(this);
mAuthProgressDialog.setTitle("Loading");
mAuthProgressDialog.setMessage("Authenticating with Firebase...");
mAuthProgressDialog.setCancelable(false);
mAuthProgressDialog.show();
mAuthStateListener = new Firebase.AuthStateListener() {
@Override
public void onAuthStateChanged(AuthData authData) {
mAuthProgressDialog.hide();
setAuthenticatedUser(authData);
}
};
/* Check if the user is authenticated with Firebase already. If this is the case we can set the authenticated
* user and hide hide any login buttons */
mFirebaseRef.addAuthStateListener(mAuthStateListener);
}
@Override
protected void onDestroy() {
super.onDestroy();
// if changing configurations, stop tracking firebase session.
mFirebaseRef.removeAuthStateListener(mAuthStateListener);
}
/**
* This method fires when any startActivityForResult finishes. The requestCode maps to
* the value passed into startActivityForResult.
*/
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Map<String, String> options = new HashMap<String, String>();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
/* If a user is currently authenticated, display a logout menu */
if (this.mAuthData != null) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
} else {
return false;
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_logout) {
logout();
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Unauthenticate from Firebase and from providers where necessary.
*/
private void logout() {
if (this.mAuthData != null) {
/* logout of Firebase */
mFirebaseRef.unauth();
}
/* Update authenticated user and show login buttons */
setAuthenticatedUser(null);
}
/**
* This method will attempt to authenticate a user to firebase given an oauth_token (and other
* necessary parameters depending on the provider)
*/
private void authWithFirebase(final String provider, Map<String, String> options) {
if (options.containsKey("error")) {
showErrorDialog(options.get("error"));
} else {
mAuthProgressDialog.show();
if (provider.equals("twitter")) {
// if the provider is twitter, we pust pass in additional options, so use the options endpoint
mFirebaseRef.authWithOAuthToken(provider, options, new AuthResultHandler(provider));
} else {
// if the provider is not twitter, we just need to pass in the oauth_token
mFirebaseRef.authWithOAuthToken(provider, options.get("oauth_token"), new AuthResultHandler(provider));
}
}
}
/**
* Once a user is logged in, take the mAuthData provided from Firebase and "use" it.
*/
private void setAuthenticatedUser(AuthData authData) {
if (authData != null) {
/* Hide all the login buttons */
mPasswordLoginButton.setVisibility(View.GONE);
mAnonymousLoginButton.setVisibility(View.GONE);
mLoggedInStatusTextView.setVisibility(View.VISIBLE);
/* show a provider specific status text */
String name = null;
if (authData.getProvider().equals("facebook")
|| authData.getProvider().equals("google")
|| authData.getProvider().equals("twitter")) {
name = (String) authData.getProviderData().get("displayName");
} else if (authData.getProvider().equals("anonymous")
|| authData.getProvider().equals("password")) {
name = authData.getUid();
} else {
Log.e(TAG, "Invalid provider: " + authData.getProvider());
}
if (name != null) {
mLoggedInStatusTextView.setText("Logged in as " + name + " (" + authData.getProvider() + ")");
}
} else {
/* No authenticated user show all the login buttons */
mPasswordLoginButton.setVisibility(View.VISIBLE);
mAnonymousLoginButton.setVisibility(View.VISIBLE);
mLoggedInStatusTextView.setVisibility(View.GONE);
}
this.mAuthData = authData;
/* invalidate options menu to hide/show the logout button */
supportInvalidateOptionsMenu();
}
/**
* Show errors to users
*/
private void showErrorDialog(String message) {
new AlertDialog.Builder(this)
.setTitle("Error")
.setMessage(message)
.setPositiveButton(android.R.string.ok, null)
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
/**
* Utility class for authentication results
*/
private class AuthResultHandler implements Firebase.AuthResultHandler {
private final String provider;
public AuthResultHandler(String provider) {
this.provider = provider;
}
@Override
public void onAuthenticated(AuthData authData) {
mAuthProgressDialog.hide();
Log.i(TAG, provider + " auth successful");
setAuthenticatedUser(authData);
}
@Override
public void onAuthenticationError(FirebaseError firebaseError) {
mAuthProgressDialog.hide();
showErrorDialog(firebaseError.toString());
}
}
/* ************************************
* PASSWORD *
**************************************
*/
public void loginWithPassword() {
mAuthProgressDialog.show();
mFirebaseRef.authWithPassword("test@firebaseuser.com", "test1234", new AuthResultHandler("password"));
}
/* ************************************
* ANONYMOUSLY *
**************************************
*/
private void loginAnonymously() {
mAuthProgressDialog.show();
mFirebaseRef.authAnonymously(new AuthResultHandler("anonymous"));
}
public void switchToRegister(View v) {
Intent Register = new Intent(this, Register.class);
startActivity(Register);
}
}
and as you would guys see i declared the class as public and extended AppCompatActivity ( not sure what i had to extend just learned that from another tutorial ) i also tried to extend it from Application, which i thought could work, but then all sort of errors poped up in the code listed :
in the manifesto :
<?xml version="1.0" encoding="utf-8"?>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.USE_CREDENTIALS" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity
android:name="net.we4x4.we4x4.MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".LoginFragment">
</activity>
<activity android:name=".Register">
</activity>
<!-- ATTENTION: This was auto-generated to add Google Play services to your project for
App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information. -->
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
in line 27 under .LoginFragment it says that it is not assignable to android.app.activity ?
and then in the code itself LoginFragment :
i get these errors which i could not solve :
line 58 - setContentView cant resolve this method ?
setContentView(R.layout.fragment_login);
line 63 findViewById also cant resolve this method ?
mPasswordLoginButton = (Button) findViewById(R.id.login_with_password);
the same anonymous option line 75
mAnonymousLoginButton = (Button) findViewById(R.id.login_anonymously);
the same problem with line 86 findViewById ?
mLoggedInStatusTextView = (TextView) findViewById(R.id.login_status);
Apparently i need to create findViewById mehtod if i want to extends Application, but i did not proceed with this since i do not know if i should extends from Application, considering i do not get any of these errors in the code when i extends from MainActivity or AppCompatActivity
also i get on line 114 cant resolve this method
super.onDestroy();
and few others .... ?
so i am not sure how to solve this problem ? should i extends Application and tackle these errors ( and how to solve these errrors ) or keep the extend of MainActivity or AppCompatActivity ? which contain no error in the code but will not function properly switching activity:
my MainActivity is :
package net.we4x4.we4x4;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.MediaController;
import android.widget.VideoView;
import com.firebase.client.Firebase;
public class MainActivity extends AppCompatActivity {
public static final String VID_URL = "http://res.cloudinary.com/wi4x4/video/upload/v1457270321/bolivia_njb6r0.mp4";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
Firebase.setAndroidContext(this);
VideoView vid = (VideoView)findViewById(R. id.VidClip);
Uri video = Uri.parse(VID_URL);
vid.setMediaController(new MediaController(this));
vid.setVideoURI(video);
vid.requestFocus();
}
}
public void switchToLoginFragment(View v) {
Intent LoginFragment = new Intent(this, LoginFragment.class);
startActivity(LoginFragment);
}
public void switchToRegister(View v) {
Intent Register = new Intent(this, Register.class);
startActivity(Register);
}
}
and the error log is :
6:16:51 PM AssertionError: Wrong element range PsiJavaFile:LoginFragment.java; committed=true
android monitor :
03-07 18:19:52.512 21730-21730/net.we4x4.we4x4 E/AndroidRuntime: FATAL EXCEPTION: main
Process: net.we4x4.we4x4, PID: 21730
java.lang.RuntimeException: Unable to start activity ComponentInfo{net.we4x4.we4x4/net.we4x4.we4x4.LoginFragment}: java.lang.IllegalStateException: For a custom firebase host you must first set your authentication server before using authentication features!
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2429)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493)
at android.app.ActivityThread.access$800(ActivityThread.java:166)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1283)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5584)
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:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: For a custom firebase host you must first set your authentication server before using authentication features!
at com.firebase.client.authentication.AuthenticationManager.checkServerSettings(AuthenticationManager.java:221)
at com.firebase.client.authentication.AuthenticationManager.addAuthStateListener(AuthenticationManager.java:625)
at com.firebase.client.Firebase.addAuthStateListener(Firebase.java:555)
at net.we4x4.we4x4.LoginFragment.onCreate(LoginFragment.java:107)
at android.app.Activity.performCreate(Activity.java:5447)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2393)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493)
at android.app.ActivityThread.access$800(ActivityThread.java:166)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1283)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5584)
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:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
解决方案 This exception:
java.lang.RuntimeException: Unable to start activity ComponentInfo{net.we4x4.we4x4/net.we4x4.we4x4.LoginFragment}: java.lang.IllegalStateException: For a custom firebase host you must first set your authentication server before using authentication features!
Comes from this line:
mFirebaseRef = new Firebase(getResources().getString(R.string.firebase_url));
The reason is that firebase_url is not in the form https://yours.firebaseio.com.
这篇关于切换到firebase-应用程序的活动关闭的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
