当我在Android模拟器中构建我的应用程序时,登录屏幕不显示密码字段和用户名字段文本。我没有在log cat文件中看到任何错误。我检查并重新检查了我的activity_login.xml布局文件和
ActivityLogin.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:id="@+id/toolbar"
tools:context="com.example.kanak.selfdistructtext.LoginActivity"
android:background="@color/background_floating_material_light">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/UserNameField"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="@string/user_name_field"
android:inputType="text" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:ems="10"
android:id="@+id/PasswordField"
android:layout_below="@+id/UserNameField"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="@string/password_field" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/log_in_button"
android:id="@+id/Loginbutton"
android:layout_below="@+id/PasswordField"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="@string/sing_up"
android:id="@+id/Sign_up_link"
android:layout_marginTop="74dp"
android:layout_below="@+id/Loginbutton"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="151dp"
android:layout_marginStart="151dp" />
</RelativeLayout>
MainActivity.Java
package com.example.kanak.selfdistructtext;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.app.ActionBar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import com.parse.Parse;
import com.parse.ParseAnalytics;
import com.parse.ParseObject;
import com.parse.ParseUser;
public class MainActivity extends AppCompatActivity{
public static final String TAG = MainActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.app_bar_main);
//Parse.initialize(this, "1UG3pTBg184gaIDzKNAqfrZnAYiXcW4xn8SSdiJv", "uTZhgB0edmy06OOdpcbriho7DypKsGybPfGZSGL1");
// Parase Analytice
ParseAnalytics.trackAppOpenedInBackground(getIntent());
ParseUser currentUser = ParseUser.getCurrentUser();
if (currentUser == null) {
navigateToLogin();
} else {
Log.i(TAG, currentUser.getUsername());
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
private void navigateToLogin() {
Intent intent = new Intent(this, LoginActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu){
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected (MenuItem item){
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_logout) {
ParseUser.logOut();
navigateToLogin();
}
return super.onOptionsItemSelected(item);
}
}
LoginActivity.Java
[package com.example.kanak.selfdistructtext;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.parse.LogInCallback;
import com.parse.ParseException;
import com.parse.ParseUser;
public class LoginActivity extends AppCompatActivity {
protected EditText mUsername;
protected EditText mPassword;
protected Button mLoginButton;
protected TextView mSignUpTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.app_bar_main);
mSignUpTextView = (TextView)findViewById(R.id.Sign_up_link);
mSignUpTextView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(LoginActivity.this, SignUpActivity.class);
startActivity(intent);
}
});
mUsername = (EditText)findViewById(R.id.UserNameField);
mPassword = (EditText)findViewById(R.id.PasswordField);
mLoginButton = (Button)findViewById(R.id.Loginbutton);
mLoginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String username = mUsername.getText().toString();
String password = mPassword.getText().toString();
username = username.trim();
password = password.trim();
if (username.isEmpty() || password.isEmpty()) {
AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
builder.setMessage(R.string.Login_Error_Message);
builder.setTitle(R.string.Login_Error_Title);
builder.setPositiveButton(android.R.string.ok, null);
AlertDialog dialog = builder.create();
dialog.show();
} else {
// Log In User
ParseUser.logInInBackground(username, password, new LogInCallback() {
@Override
public void done(ParseUser parseUser, ParseException e) {
if (e == null) {
// success signing in
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
else {
AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
builder.setMessage(e.getMessage());
builder.setTitle(R.string.Login_Error_Title);
builder.setPositiveButton(android.R.string.ok, null);
AlertDialog dialog = builder.create();
dialog.show();
}
}
});
}
}
});
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
}][1]
答案 0 :(得分:2)
您正在使用xml的MainActivity设置LoginActivity的主要内容。所以在LoginActivity中设置LoginActivity的xml。
替换
setContentView(R.layout.app_bar_main);
到
setContentView(R.layout.activity_login);
LoginActivity.java
中的
您需要为v7的工具栏使用以下代码。
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:background="@mipmap/navbg"
local:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
local:popupTheme="@style/ThemeOverlay.AppCompat.Light"
/>
答案 1 :(得分:1)
您似乎为登录活动内容设置了错误的视图
所以在LoginActivity.java
中
变化
setContentView(R.layout.app_bar_main);
到
setContentView(R.layout.activity_login);