QQ登录

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.itheima28.qqlogin"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="17" /><!--     写入sd卡的权限 -->    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.itheima28.qqlogin.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

activity_main.xml

<LinearLayout 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"    android:orientation="vertical"    tools:context=".MainActivity" >    <EditText        android:id="@+id/et_number"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:hint="请输入QQ号" />    <EditText        android:id="@+id/et_password"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:hint="请输入密码"        android:inputType="textPassword" />    <CheckBox        android:id="@+id/cb_remerber_pwd"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:checked="true"        android:text="记住密码" />    <Button        android:id="@+id/btn_login"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="登录" /></LinearLayout>

src/kdw/qqlogin/MainActivity.java

package com.itheima28.qqlogin;import java.util.Map;import android.app.Activity;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;import com.itheima28.qqlogin.utils.Utils;import com.itheima28.qqlogin.utils.UtilsOfSharedPreferences;public class MainActivity extends Activity implements OnClickListener {    private static final String TAG = "MainActivity";    private EditText etNumber;    private EditText etPassword;    private CheckBox cbRemerberPWD;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        etNumber = (EditText) findViewById(R.id.et_number);        etPassword = (EditText) findViewById(R.id.et_password);        cbRemerberPWD = (CheckBox) findViewById(R.id.cb_remerber_pwd);        Button btnLogin = (Button) findViewById(R.id.btn_login);        btnLogin.setOnClickListener(this);        // 回显数据        Map<String, String> userInfoMap = UtilsOfSharedPreferences.getUserInfo(this);        if(userInfoMap != null) {            etNumber.setText(userInfoMap.get("number"));            etPassword.setText(userInfoMap.get("password"));        }    }    @Override    public void onClick(View v) {        // 执行登录的操作        // 1. 取出号码和密码        String number = etNumber.getText().toString();        String password = etPassword.getText().toString();        if(TextUtils.isEmpty(number) || TextUtils.isEmpty(password)) {            // 弹出吐司            Toast.makeText(this, "请正确输入", Toast.LENGTH_SHORT).show();            return;        }        // 2. 判断记住密码是否被选中, 如果被选中, 存起来        if(cbRemerberPWD.isChecked()) {            // 当前需要记住密码            Log.i(TAG, "记住密码: " + number + ", " + password);            boolean isSuccess = UtilsOfSharedPreferences.saveUserInfo(this, number, password);            if(isSuccess) {                Toast.makeText(this, "保存成功", 0).show();            } else {                Toast.makeText(this, "保存失败", 0).show();            }        }        // 3. 登陆成功        Toast.makeText(this, "登录成功", 0).show();    }}

src\com\itheima28\qqlogin\Utils.java

package com.itheima28.qqlogin.utils;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.util.HashMap;import java.util.Map;import android.content.Context;import android.text.TextUtils;public class Utils {    /**     * 保存用户信息     * @param number     * @param password     * @return true 成功     */    public static boolean saveUserInfo(String number, String password) {        try {            String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";            FileOutputStream fos = new FileOutputStream(path);            // 307966990##123123            String data = number + "##" + password;            fos.write(data.getBytes());            fos.flush();            fos.close();            return true;        } catch (Exception e) {            e.printStackTrace();        }        return false;    }    /**     * 保存用户信息     * @param number     * @param password     * @return true 成功     */    public static boolean saveUserInfo(Context context, String number, String password) {        try {//          String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";//          File filesDir = context.getFilesDir();            File filesDir = context.getCacheDir();            File f = new File(filesDir, "itheima28.txt");            FileOutputStream fos = new FileOutputStream(f);            // 307966990##123123            String data = number + "##" + password;            fos.write(data.getBytes());            fos.flush();            fos.close();            return true;        } catch (Exception e) {            e.printStackTrace();        }        return false;    }    /**     * 返回用户信息     * @return     */    public static Map<String, String> getUserInfo() {        try {            String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";            FileInputStream fis = new FileInputStream(path);            // 字符流对象            BufferedReader reader = new BufferedReader(new InputStreamReader(fis));            // 307966990##123123            String text = reader.readLine();            if(!TextUtils.isEmpty(text)) {                String[] split = text.split("##");                Map<String, String> userInfoMap = new HashMap<String, String>();                userInfoMap.put("number", split[0]);                userInfoMap.put("password", split[1]);                return userInfoMap;            }        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    /**     * 返回用户信息     * @return     */    public static Map<String, String> getUserInfo(Context context) {        try {//          String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";//          File filesDir = context.getFilesDir();            File filesDir = context.getCacheDir();            File f = new File(filesDir, "itheima28.txt");            FileInputStream fis = new FileInputStream(f);            // 字符流对象            BufferedReader reader = new BufferedReader(new InputStreamReader(fis));            // 307966990##123123            String text = reader.readLine();            if(!TextUtils.isEmpty(text)) {                String[] split = text.split("##");                Map<String, String> userInfoMap = new HashMap<String, String>();                userInfoMap.put("number", split[0]);                userInfoMap.put("password", split[1]);                return userInfoMap;            }        } catch (Exception e) {            e.printStackTrace();        }        return null;    }}

src\com\itheima28\qqlogin\UtilsOfSDCard.java

package com.itheima28.qqlogin.utils;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.util.HashMap;import java.util.Map;import android.content.Context;import android.os.Environment;import android.text.TextUtils;public class UtilsOfSDCard {    /**     * 保存用户信息到sd卡     * @param number     * @param password     * @return true 成功     */    public static boolean saveUserInfo(Context context, String number, String password) {        try {            // 判断当前的手机是否有sd卡            String state = Environment.getExternalStorageState();            if(!Environment.MEDIA_MOUNTED.equals(state)) {                // 已经挂载了sd卡                return false;            }            File sdCardFile = Environment.getExternalStorageDirectory();            File file = new File(sdCardFile, "itheima28.txt");            FileOutputStream fos = new FileOutputStream(file);            String data = number + "##" + password;            fos.write(data.getBytes());            fos.flush();            fos.close();            return true;        } catch (Exception e) {            e.printStackTrace();        }        return false;    }    /**     * 到sd卡获取用户信息     * @return     */    public static Map<String, String> getUserInfo(Context context) {        try {            // 判断当前的手机是否有sd卡            String state = Environment.getExternalStorageState();            if(!Environment.MEDIA_MOUNTED.equals(state)) {                // 已经挂载了sd卡                return null;            }            File sdCardFile = Environment.getExternalStorageDirectory();            File file = new File(sdCardFile, "itheima28.txt");            BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));            String text = br.readLine();            br.close();            if(!TextUtils.isEmpty(text)) {                Map<String, String> userInfoMap = new HashMap<String, String>();                String[] split = text.split("##");                userInfoMap.put("number", split[0]);                userInfoMap.put("password", split[1]);                return userInfoMap;            }        } catch (Exception e) {            e.printStackTrace();        }        return null;    }}

src\com\itheima28\qqlogin\UtilsOfSharedPreferences.java

package com.itheima28.qqlogin.utils;import java.util.HashMap;import java.util.Map;import android.content.Context;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.text.TextUtils;public class UtilsOfSharedPreferences {    /**     * 保存用户信息到sd卡     * @param number     * @param password     * @return true 成功     */    public static boolean saveUserInfo(Context context, String number, String password) {        try {            // /data/data/包名/shared_prefs/itheima28            SharedPreferences sp = context.getSharedPreferences("itheima28", Context.MODE_PRIVATE);            // 获得一个编辑对象            Editor edit = sp.edit();            // 存数据            edit.putString("number", number);            edit.putString("password", password);            // 提交, 数据真正存储起来了.            edit.commit();            return true;        } catch (Exception e) {            e.printStackTrace();        }        return false;    }    /**     * 到sd卡获取用户信息     * @return     */    public static Map<String, String> getUserInfo(Context context) {        SharedPreferences sp = context.getSharedPreferences("itheima28", Context.MODE_PRIVATE);        String number = sp.getString("number", null);        String password = sp.getString("password", null);        if(!TextUtils.isEmpty(number) && !TextUtils.isEmpty(password)) {            Map<String, String> userInfoMap = new HashMap<String, String>();            userInfoMap.put("number", number);            userInfoMap.put("password", password);            return userInfoMap;        }        return null;    }}