本實驗是簡單的登錄界面—EditText編輯框的應用,在該界面中,若輸入正確的用戶名(假設爲e1001)和密碼(假設爲1234567),單擊“確定”按鈕,將出現一個Toast提示“恭喜您登錄成功!”;否則將提示“請輸入正確的用戶名或密碼!”。單擊“清空”按鈕,則會清空所填寫的姓名和密碼內容。
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
tools:context="com.example.hades.homework5.MainActivity">
<LinearLayout
android:layout_width="374dp"
android:layout_height="497dp"
android:orientation="vertical"
tools:layout_editor_absoluteY="6dp"
tools:layout_editor_absoluteX="8dp">
<LinearLayout
android:layout_width="374dp"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.77"
android:text="用戶名"
android:textSize="20dp" />
<EditText
android:id="@+id/username"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="textPersonName"
android:text="e10001" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp">
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="密碼"
android:textSize="20dp" />
<EditText
android:id="@+id/password"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="textPassword"
android:text="1234567" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="登錄" />
<Button
android:id="@+id/clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="清除" />
</LinearLayout>
</LinearLayout>
</android.support.constraint.ConstraintLayout>
MainActivity.java
package com.example.hades.homework5;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
Button login, clear;
TextView username, password;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
login = (Button) findViewById(R.id.login);
clear = (Button) findViewById(R.id.clear);
username = (TextView) findViewById(R.id.username);
password = (TextView) findViewById(R.id.password);
login.setOnClickListener(new click1());
clear.setOnClickListener(new click2());
}
private class click1 implements View.OnClickListener {
@Override
public void onClick(View v) {
if (username.toString().isEmpty() || password.toString().isEmpty()) {
Toast.makeText(getApplicationContext(), "請填寫完整",
Toast.LENGTH_SHORT).show();
} else {
if (username.getText().toString().equals("e10001") && password.getText().toString().equals("1234567")) {
Toast.makeText(getApplicationContext(), "登錄成功",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "用戶名或密碼錯誤",
Toast.LENGTH_SHORT).show();
}
}
}
}
private class click2 implements View.OnClickListener {
@Override
public void onClick(View v) {
username.setText("");
password.setText("");
}
}
}