[英]Click Action not Working on Button - Java and Android Studio
我不得不問這個問題,覺得自己很蠢,但是我正在開發一個需要登錄的簡單應用程序。 如果輸入了正確的憑據,它將重定向到設置/首選項活動。 如果不是,則顯示錯誤。 簡單吧? 但是,無論何時單擊按鈕,都不會發生任何事情。
login.java
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
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;
public class login extends AppCompatActivity {
EditText userName;
EditText password;
Boolean verified = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Button loginButton = (Button) findViewById(R.id.loginButton);
userName = (EditText) findViewById(R.id.userNameField);
password = (EditText) findViewById(R.id.passwordField);
loginButton.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
if ((userName.getText().toString() != "bkAdmin") || (password.getText().toString() != "midAmBK")) {
verified = false;
} else {
verified = true;
}
}
});
SharedPreferences preferences = getSharedPreferences("config.xml", MODE_PRIVATE);
if (verified) {
Intent intent = new Intent(this, midamcorp.com.burgerkingapp.preferences.class);
SharedPreferences.Editor editor = preferences.edit();
editor.putBoolean("loggedIn", true);
editor.commit();
if (preferences.getBoolean("config", false)) {
editor.putBoolean("config", true);
editor.commit();
}
startActivity(intent);
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Invalid Username or Password");
builder.setPositiveButton("Accept", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
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();
}
});
}
}
}
content_login.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="midamcorp.com.burgerkingapp.login"
tools:showIn="@layout/activity_login">
<TableLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TableRow android:layout_marginBottom="50dp">
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:minWidth="200dp"
android:text=" Username:" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/userNameField"
android:minWidth="200dp"
/>
</TableRow>
<TableRow android:layout_marginBottom="50dp">
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:minWidth="200dp"
android:text=" Password:" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:minWidth="200dp"
android:id="@+id/passwordField"
/>
</TableRow>
<TableRow>
<Button
android:id="@+id/loginButton"
android:text = "Login!" />
</TableRow>
</TableLayout>
</RelativeLayout>
我真的非常感謝您的幫助!
嘗試這樣的事情。 將您的代碼包裝在一個方法中,並在您的按鈕click事件中調用它。
loginButton.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
if ((userName.getText().toString() != "bkAdmin") || (password.getText().toString() != "midAmBK")) {
verified = false;
} else {
verified = true;
}
completeRegistration(verified);
}
});
}
用一種方法包裝
private void completeRegistration(boolean verified){
if (verified) {
Intent intent = new Intent(this, midamcorp.com.burgerkingapp.preferences.class);
SharedPreferences.Editor editor = preferences.edit();
editor.putBoolean("loggedIn", true);
editor.commit();
if (preferences.getBoolean("config", false)) {
editor.putBoolean("config", true);
editor.commit();
}
startActivity(intent);
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Invalid Username or Password");
builder.setPositiveButton("Accept", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
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();
}
});
}
}
您可以在onCreate方法中初始化活動。 您已驗證的變量將始終為false。 onCreate完成后,將執行按鈕單擊的回調。 將邏輯移至其他方法或放入按鈕回調中。
使用View.OnClickListener而不是Button.onClickListener
您必須編寫代碼以導航到設置屏幕或在OnClickListener
顯示錯誤對話框。 目前它不在外面。 嘗試這個 -
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
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;
public class login extends AppCompatActivity {
EditText userName;
EditText password;
Boolean verified = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Button loginButton = (Button) findViewById(R.id.loginButton);
userName = (EditText) findViewById(R.id.userNameField);
password = (EditText) findViewById(R.id.passwordField);
loginButton.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
if ((userName.getText().toString() != "bkAdmin") || (password.getText().toString() != "midAmBK")) {
verified = false;
} else {
verified = true;
}
SharedPreferences preferences = getSharedPreferences("config.xml", MODE_PRIVATE);
if (verified) {
Intent intent = new Intent(login.this, midamcorp.com.burgerkingapp.preferences.class);
SharedPreferences.Editor editor = preferences.edit();
editor.putBoolean("loggedIn", true);
editor.commit();
if (preferences.getBoolean("config", false)) {
editor.putBoolean("config", true);
editor.commit();
}
startActivity(intent);
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(login.this);
builder.setMessage("Invalid Username or Password");
builder.setPositiveButton("Accept", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
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();
}
});
}
}
});
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.