目标
通过 AdminLogin.xml 登录到我的 Admin.xml
课程流程
AdminLoginActivity ---> AdminActivity
AdminLoginActivityClass
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class AdminLoginActivity extends AppCompatActivity {
private Toolbar jAdminToolbar;
private EditText jAdminID;
private EditText jAdminPassword;
private Button jAdminLoginBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_admin_login);
jAdminToolbar = (Toolbar) findViewById(R.id.adminLoginToolbar);
setSupportActionBar(jAdminToolbar);
getSupportActionBar().setTitle("Admin Login");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
jAdminID = (EditText) findViewById(R.id.adminLoginName);
jAdminPassword = (EditText) findViewById(R.id.adminLoginPassword);
jAdminLoginBtn = (Button) findViewById(R.id.adminLoginBtn);
jAdminLoginBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String adminLoginID = jAdminID.getText().toString();
String adminLoginPassword = jAdminPassword.getText().toString();
if(adminLoginID.equals("admin")&& adminLoginPassword.equals("admin")){
Intent intentAdmin = new Intent(AdminLoginActivity.this, AdminActivity.class);
intentAdmin.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intentAdmin);
finish();
}else{
Toast.makeText(AdminLoginActivity.this, "Failed Login", Toast.LENGTH_SHORT).show();
return;
}
}
});
}
}
AdminActivityClass
import android.content.Intent;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
public class AdminActivity extends AppCompatActivity {
private FirebaseAuth mAdminAuth;
private Toolbar jAdminToolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_admin);
mAdminAuth = FirebaseAuth.getInstance();
jAdminToolbar = (Toolbar) findViewById(R.id.adminToolbar);
setSupportActionBar(jAdminToolbar);
getSupportActionBar().setTitle("Administrator");
}
@Override
public void onStart() {
super.onStart();
FirebaseUser currentUser = mAdminAuth.getCurrentUser();
if(currentUser == null){
sendUserToStartPage();
}
}
private void sendUserToStartPage(){
Intent intentStart = new Intent(AdminActivity.this, StartActivity.class);
startActivity(intentStart);
finish();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.activity_admin_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
if(item.getItemId() == R.id.mainSignOutBtn){
FirebaseAuth.getInstance().signOut();
sendUserToStartPage();
}
if(item.getItemId() == R.id.mainViewContactsBtn){
Intent intentViewContacts = new Intent(AdminActivity.this, AllUsersActivity.class);
startActivity(intentViewContacts);
}
return true;
}
}
清单文件
<?xml version="1.0" encoding="utf-8"?>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:name=".SecurityApp"
android:allowBackup="true"
android:icon="@mipmap/appiconone"
android:label="@string/app_name"
android:roundIcon="@mipmap/appiconone"
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>
<activity android:name=".StartActivity" />
<activity
android:name=".ResidentRegistrationActivity"
android:parentActivityName=".StartActivity" />
<activity
android:name=".AdminLoginActivity"
android:parentActivityName=".LoginActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.lenovo.securityapp.LoginActivity" />
</activity>
<activity
android:name=".LoginActivity"
android:parentActivityName=".StartActivity" />
<activity
android:name=".SettingsActivity"
android:parentActivityName=".MainActivity" />
<activity
android:name=".DetailsActivity"
android:parentActivityName=".SettingsActivity" />
<activity
android:name=".AllUsersActivity"
android:parentActivityName=".MainActivity" />
<activity android:name=".UserProfileActivity" />
<activity
android:name=".HelpInformationActivity"
android:parentActivityName=".StartActivity" />
<activity android:name=".AdminActivity" />
</application>
问题
- 当我选择后退按钮时，AdminLogin 上的工具栏不允许我返回 LoginActivity
- 尽管输入了管理员名称和密码的硬编码输入，但管理员登录不起作用。单击登录按钮后，应用程序会提示白色布局几秒钟，我被带回 StartActivity，并且 Toast 消息未显示“登录失败”。
解决方案
问题是因为“AdminActivityClass”有
@Override
public void onStart() {
super.onStart();
FirebaseUser currentUser = mAdminAuth.getCurrentUser();
if(currentUser == null){
sendUserToStartPage();
}
}
private void sendUserToStartPage(){
Intent intentStart = new Intent(AdminActivity.this, StartActivity.class);
startActivity(intentStart);
finish();
}
由于 Admin 登录是硬编码的，所以 insidecurrentUser被FirebaseUser currentUser = mAdminAuth.getCurrentUser();设置为null. 这导致活动被发送回起始页 ( sendUserToStartPage();)