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=".MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:background="#55000000" android:orientation="vertical" android:paddingLeft="30dp" android:paddingRight="30dp" > <LinearLayout android:layout_marginTop="80dp" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_vertical" android:orientation="horizontal" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="QQ" android:textColor="#fff" android:textSize="50dp" /> </LinearLayout> <EditText android:id="@+id/userid" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:background="@null" android:hint="QQ号/手机号/邮箱" android:maxLength="13" android:singleLine="true" android:textColor="#fff" android:textSize="25sp" android:textColorHint="#eee" /> <View android:layout_width="match_parent" android:layout_height="1px" android:layout_marginTop="10dp" android:background="#eee" /> <EditText android:id="@+id/lipassword" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:background="@null" android:hint="密码" android:inputType="textPassword" android:maxLength="13" android:singleLine="true" android:textColor="#fff" android:textSize="25dp" android:textColorHint="#eee" /> <View android:layout_width="match_parent" android:layout_height="1px" android:layout_marginTop="10dp" android:background="#eee" /> <Button android:id="@+id/login" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:background="#aaafff" android:text="登录" android:onClick="onClick" android:textColor="#fff" android:textSize="25sp" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:orientation="horizontal" > <CheckBox android:id="@+id/cbRemember" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="15dp" android:text="记住密码" android:textSize="20sp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="right" android:text="新用户注册" android:textColor="#cc1CA4DE" android:textSize="20dp" /> </LinearLayout> </LinearLayout></android.support.constraint.ConstraintLayout>java
package com.example.denglu;import android.app.Notification;import android.content.SharedPreferences;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends AppCompatActivity { EditText userid; //声明控件 EditText lipassword; Button login; private CheckBox cbRemember; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); userid=(EditText)findViewById(R.id.userid); //控件的初始化 lipassword=(EditText)findViewById(R.id.lipassword); login=(Button)findViewById(R.id.login); //监听 cbRemember = findViewById(R.id.cbRemember); SharedPreferences sp = getSharedPreferences("date", MODE_PRIVATE); userid.setText(sp.getString("name", "")); lipassword.setText(sp.getString("password", "")); login.setOnClickListener(new View.OnClickListener() { @Override //方法的调用 public void onClick(View view) { if ("admin".equals(userid.getText().toString())&&"admin".equals(lipassword.getText().toString())) { if (cbRemember.isChecked()) { SharedPreferences sp = getSharedPreferences("date", MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); editor.putString("name", userid.getText().toString()); editor.putString("password", lipassword.getText().toString()); editor.commit(); Toast t1 = Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_SHORT); t1.show(); } else { SharedPreferences sp = getSharedPreferences("date", MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); editor.putString("name", ""); editor.putString("password", ""); editor.commit(); Toast t3 = Toast.makeText(getApplicationContext(), "登录成功，保存失败", Toast.LENGTH_SHORT); t3.show(); } } else { Toast t2 = Toast.makeText(getApplicationContext(), "登录失败", Toast.LENGTH_SHORT); t2.show(); userid.setText(""); lipassword.setText(""); } } }); }
}
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