QQ登录

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“QQ登录”程序对应的布局文件（activity_main.xml）如下所示：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.bz0209.qq.MainActivity"    android:background="#E6E6E6"    android:orientation="vertical"    >    <ImageView        android:id="@+id/iv_head"        android:layout_width="70dp"        android:layout_height="60dp"        android:layout_centerHorizontal="true"        android:layout_marginTop="40dp"        android:src="@drawable/cc"/>    <LinearLayout        android:id="@+id/layout"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@+id/iv_head"        android:layout_margin="10dp"        android:background="#ffffff"        android:orientation="vertical">        <RelativeLayout            android:id="@+id/rl_username"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_margin="10dp">            <TextView                android:id="@+id/tv_name"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_centerVertical="true"                android:text="账号"/>            <EditText                android:id="@+id/et_number"                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:layout_marginLeft="5dp"                android:layout_toRightOf="@+id/tv_name"                android:background="@null"/>        </RelativeLayout>        <View            android:layout_width="match_parent"            android:layout_height="2dp"            android:background="#E6E6E6"/>        <RelativeLayout            android:id="@+id/rl_userpas"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_margin="10dp">            <TextView                android:id="@+id/tv_psw"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_centerVertical="true"                android:text="密码"/>            <EditText                android:id="@+id/et_password"                android:layout_width="match_parent"                android:layout_height="wrap_content"               android:layout_marginLeft="5dp"                android:layout_toRightOf="@+id/tv_psw"                android:inputType="textPassword"                android:background="@null"/>        </RelativeLayout>    </LinearLayout>    <Button        android:id="@+id/btn_login"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@+id/layout"        android:layout_centerHorizontal="true"        android:layout_marginLeft="10dp"        android:layout_marginRight="10dp"        android:layout_marginTop="20dp"        android:background="#3C8DC4"        android:text="登录"        android:textColor="#ffffff"/></RelativeLayout>

Utils类用于实现QQ号码和密码的存储与获取功能：

package com.example.bz0209.qq;import android.content.Context;import android.content.SharedPreferences;import java.util.HashMap;import java.util.Map;/** * Created by Administrator on 2017/6/9. */public class Utils {    public static boolean saveUserInfo(Context context ,String number,String password){        SharedPreferences sp=context.getSharedPreferences("data",Context.MODE_PRIVATE);        SharedPreferences.Editor edit=sp.edit();        edit.putString("userName",number);        edit.putString("pwd",password);        edit.commit();        return true;    }    public static Map<String,String>getUserInfo(Context context){        SharedPreferences sp=context.getSharedPreferences("data",Context.MODE_PRIVATE);        String number=sp.getString("username",null);        String password=sp.getString("pwd",null);        Map<String,String>userMap=new HashMap<String,String>();        userMap.put("number",number);        userMap.put("password",password);        return userMap;    }}

在MainActivity中，实现当用户输入完QQ号码和密码，选择记住密码，单击登录按钮时调用Utils.saveUserInfo()方法保存QQ密码：

package com.example.bz0209.qq;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.widget.EditText;import android.widget.Toast;import java.util.Map;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private EditText etNumber;    private EditText etPassword;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initview();        Map<String,String>userInfo=Utils.getUserInfo(this);        if (userInfo!=null){            etNumber.setText(userInfo.get("number"));            etPassword.setText(userInfo.get("password"));        }    }    private void initview() {        etNumber=(EditText)findViewById(R.id.et_number);        etPassword=(EditText)findViewById(R.id.et_password);        findViewById(R.id.btn_login).setOnClickListener( this);    }    public void onClick(View v){        //当单击登录按钮时        String number=etNumber.getText().toString().trim();        String password=etPassword.getText().toString();        //检验号码和密码是否正确        if (TextUtils.isEmpty(number)){            Toast.makeText(this,"请输入QQ号码",Toast.LENGTH_SHORT).show();            return;        }        if (TextUtils.isEmpty(password)){            Toast.makeText(this,"请输入密码",Toast.LENGTH_SHORT).show();            return;        }        Toast.makeText(this,"登陆成功",Toast.LENGTH_SHORT).show();        Log.i("MainActivity","记住密码："+number+","+password);        boolean isSaveSuccess=Utils.saveUserInfo(this,number,password);        if (isSaveSuccess){            Toast.makeText(this,"保存成功",Toast.LENGTH_SHORT).show();        }else {            Toast.makeText(this,"保存失败",Toast.LENGTH_SHORT).show();        }    }}

运行结果图：

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