設計一個登錄界面。要求:
a) 包含用戶名、密碼、記住密碼、“忘記密碼”按鈕和“登錄”按鈕。
b) 單擊“忘記密碼”按鈕彈出提示對話框,對話框內容自擬。
編輯文件:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".MainActivity">
<EditText
android:id="@+id/inputusername"
android:layout_width="209dp"
android:layout_height="50dp"
android:layout_marginStart="30dp"
android:layout_marginLeft="30dp"
android:layout_marginTop="100dp"
android:ems="10"
android:hint="請輸入用戶名"
android:inputType="textPersonName"
app:layout_constraintStart_toEndOf="@+id/username"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/inputpassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="200dp"
android:ems="10"
android:hint="請輸入密碼"
android:inputType="textPersonName"
app:layout_constraintLeft_toLeftOf="@+id/inputusername"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/username"
android:layout_width="90dp"
android:layout_height="50dp"
android:layout_marginStart="20dp"
android:layout_marginLeft="20dp"
android:ems="10"
android:text="用戶名:"
android:textSize="20dp"
android:gravity="center"
app:layout_constraintBottom_toBottomOf="@+id/inputusername"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/inputusername" />
<TextView
android:id="@+id/password"
android:layout_width="90dp"
android:layout_height="50dp"
android:ems="10"
android:gravity="center"
android:text="密 碼:"
android:textSize="20dp"
app:layout_constraintBottom_toBottomOf="@+id/inputpassword"
app:layout_constraintRight_toRightOf="@+id/username"
app:layout_constraintTop_toTopOf="@+id/inputpassword" />
<RadioButton
android:id="@+id/rem_password"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="記住密碼"
android:textSize="20dp"
app:layout_constraintTop_toBottomOf="@+id/password"
app:layout_constraintLeft_toLeftOf="@+id/password"
tools:layout_editor_absoluteX="101dp" />
<Button
android:id="@+id/forgetpassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:text="忘記密碼"
android:textSize="20dp"
android:onClick="alertClick"
app:layout_constraintLeft_toLeftOf="@+id/rem_password"
app:layout_constraintTop_toBottomOf="@+id/rem_password" />
<Button
android:id="@+id/button"
android:layout_width="203dp"
android:layout_height="46dp"
android:layout_marginStart="100dp"
android:layout_marginLeft="100dp"
android:layout_marginEnd="100dp"
android:layout_marginRight="100dp"
android:layout_marginBottom="100dp"
android:background="#4CAF50"
android:hint="登錄"
android:onClick="Check"
android:textColor="#130908"
android:textSize="35dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
package com.example.a171228356_3;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.app.AlertDialog;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import android.content.DialogInterface;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
// builder = new android.support.v7.app.AlertDialog.Builder(AlertDialogActivity.this);
public class MainActivity extends AppCompatActivity {
EditText name; //用戶名
EditText pass; //密碼
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//寫代碼
name=(EditText) findViewById(R.id.inputusername); //獲取用戶名
pass=(EditText) findViewById(R.id.inputpassword); //獲取密碼
}
//登錄驗證代碼
public void Check(View v) {
String mname = "hello2020";
String mpass = "123456";
String user = name.getText().toString().trim();
String pwd = pass.getText().toString().trim();
if (user.equals(mname) && pwd.equals(mpass)) {
Toast.makeText(this, "驗證通過", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "很遺憾,未通過,請重新輸入", Toast.LENGTH_SHORT).show();
}
}
public void alertClick(View v) {
//創建 一個提示對話框的構造者對象
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("提示");//設置彈出對話框的標題
builder.setIcon(R.drawable.ic_launcher_background);//設置彈出對話框的圖標
builder.setMessage("你確定使用忘記密碼方式找回賬號?該方式需要您的身份證號等個人信息進行驗證,請慎重選擇!");//設置彈出對話框的內容
builder.setCancelable(false);//能否被取消
//正面的按鈕(肯定)
builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "開始找回賬號", Toast.LENGTH_SHORT).show();
dialog.cancel();
}
});
//反面的按鈕(否定)
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "取消,返回", Toast.LENGTH_SHORT).show();
dialog.cancel();
}
});
builder.show();
}
}
仿真結果:
點擊忘記密碼提示對話框: