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  • 作业三

    <?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=".MainActivity">
    
        <ImageView
            android:id="@+id/picture"
            android:layout_width="121dp"
            android:layout_height="116dp"
            android:layout_centerHorizontal="true"
            android:layout_marginStart="33dp"
            android:layout_marginLeft="33dp"
            android:layout_marginTop="100dp"
            android:layout_marginEnd="33dp"
            android:layout_marginRight="33dp"
            android:layout_marginBottom="30dp"
            android:src="@drawable/xiaoqie"
            app:layout_constraintBottom_toTopOf="@+id/editText1"
            app:layout_constraintEnd_toEndOf="@+id/editText1"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="@+id/editText1"
            app:layout_constraintTop_toTopOf="parent" />
    
        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/editText2"
            android:layout_alignLeft="@+id/textView1"
            android:layout_alignBottom="@+id/editText2"
            android:layout_marginStart="48dp"
            android:layout_marginLeft="48dp"
            android:layout_marginEnd="25dp"
            android:layout_marginRight="25dp"
            android:text="密码:"
            android:textSize="20sp"
            app:layout_constraintBaseline_toBaselineOf="@+id/editText2"
            app:layout_constraintEnd_toStartOf="@+id/editText2"
            app:layout_constraintStart_toStartOf="parent" />
    
        <EditText
            android:id="@+id/editText2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_below="@+id/editText1"
            android:layout_alignLeft="@+id/editText1"
            android:layout_marginEnd="92dp"
            android:layout_marginRight="92dp"
            android:layout_marginBottom="35dp"
            android:ems="10"
            app:layout_constraintBottom_toTopOf="@+id/btn"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/textView2"
            app:layout_constraintTop_toBottomOf="@+id/editText1" />
    
        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/btn"
            android:layout_alignBottom="@+id/editText1"
            android:layout_marginStart="48dp"
            android:layout_marginLeft="48dp"
            android:layout_marginEnd="25dp"
            android:layout_marginRight="25dp"
            android:text="账号:"
            android:textSize="20sp"
            app:layout_constraintBaseline_toBaselineOf="@+id/editText1"
            app:layout_constraintEnd_toStartOf="@+id/editText1"
            app:layout_constraintStart_toStartOf="parent" />
    
        <Button
            android:id="@+id/btn"
            android:layout_width="250dp"
            android:layout_height="wrap_content"
            android:layout_below="@+id/editText2"
            android:layout_alignParentRight="true"
            android:layout_marginBottom="200dp"
            android:background="#00FF7F"
            android:onClick="click"
            android:text="登录"
            android:textColor="#FFFFFF"
            app:layout_constraintBottom_toTopOf="@+id/tv"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.496"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/editText2" />
    
        <EditText
            android:id="@+id/editText1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_below="@+id/picture"
            android:layout_marginEnd="92dp"
            android:layout_marginRight="92dp"
            android:layout_marginBottom="39dp"
            android:layout_toRightOf="@+id/textView1"
            android:ems="10"
            android:textColor="#000000"
            android:textSize="20sp"
            app:layout_constraintBottom_toTopOf="@+id/editText2"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/textView1"
            app:layout_constraintTop_toBottomOf="@+id/picture">
    
            <requestFocus />
        </EditText>
    
        <TextView
            android:id="@+id/tv"
            android:layout_width="99dp"
            android:layout_height="44dp"
            android:layout_below="@+id/btn"
            android:layout_centerHorizontal="true"
            android:layout_marginStart="19dp"
            android:layout_marginLeft="19dp"
            android:layout_marginEnd="19dp"
            android:layout_marginRight="19dp"
            android:layout_marginBottom="41dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="@+id/editText2"
            app:layout_constraintHorizontal_bias="0.682"
            app:layout_constraintStart_toStartOf="@+id/editText2"
            app:layout_constraintTop_toBottomOf="@+id/btn" />
        />
    
    </android.support.constraint.ConstraintLayout>
    package com.example.qwer;
    
    import android.os.Bundle;
    import android.app.Activity;
    import android.view.Menu;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
    import android.widget.Toast;
    
    public class MainActivity extends Activity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
        }
    
        private TextView textView;
    
        public void click(View view) {
            Button btn = (Button) findViewById(R.id.btn);
            EditText et1 = (EditText) findViewById(R.id.editText1);
            EditText et2 = (EditText) findViewById(R.id.editText2);
            textView = (TextView) findViewById(R.id.tv);
            switch (view.getId()) {
                case R.id.btn:
    
                    String s1 = et1.getText().toString();
                    String s2 = et2.getText().toString();
                    if (s1.equals("123456") && s2.equals("abc123")) {
                        Toast.makeText(MainActivity.this, "登录成功", 0).show(); // 点击按钮时,在下面弹出消息框
                    } else {
                        textView.setText("登录失败");
                    }
            }
        }
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  • 原文地址:https://www.cnblogs.com/ZERO-FLY/p/11493232.html
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