Android 用户登录

1：服务端代码如下

<?php
/**
*登录成功就返回 1，否则返回 0
*/
    $REQUEST_METHOD=$_SERVER['REQUEST_METHOD'];

    if($REQUEST_METHOD=='GET'){
    $name=$_GET['name'];
    $pwd=$_GET['pwd'];
    if($name=='yanshiying' && $pwd=='yanshiying'){
        echo 1;
    }else{
        echo 0;
    }
    }else if($REQUEST_METHOD=='POST'){
    $name=$_POST['name'];
    $pwd=$_POST['pwd'];
    if($name=='yanshiying' && $pwd=='yanshiying'){
        echo 1;
    }else{
        echo 0;
    }
    }
?>

2：Android Client端。

（1）：activity_main.xml

<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">

    <ProgressBar
        android:id="@+id/pb_login"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        style="?android:attr/progressBarStyleLarge"
        android:visibility="gone"/>

    <EditText
        android:id="@+id/et_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Username"/>

    <EditText
        android:id="@+id/et_pwd"
        android:layout_below="@id/et_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Password"
        android:inputType="textPassword"/>

    <CheckBox
        android:id="@+id/cb_remember"
        android:layout_below="@id/et_pwd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Remember me"/>

    <Button
        android:id="@+id/btn_login"
        android:layout_below="@id/cb_remember"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Login"/>
</RelativeLayout>

(2):UIHelper.java

为了更方便使用Toast，所以在这里自定义了一个类，进行了简单的封装。

public class UIHelper {
    private Context context=null;

    public UIHelper(Context context){
        this.context=context;
    }

    public void ShortToast(String text){
        Toast.makeText(context, text, Toast.LENGTH_SHORT).show();
    }

    public void LongToast(String text){
        Toast.makeText(context, text, Toast.LENGTH_LONG).show();
    }
}

(3):NetHelper.java

此类主要和服务端进行网络交互。

public class NetHelper {
    public static String doLogin(String url) {
        String result="";
        HttpClient client=new DefaultHttpClient();
        HttpGet get=new HttpGet(url);
        try {
            HttpResponse response=client.execute(get);
            //服务端成功响应
            if(response.getStatusLine().getStatusCode()==200){
                //取得服务端返回的数据
                result=EntityUtils.toString(response.getEntity());
            }
        } catch (Exception e) {

        }
        return result;
    }
}

(4):MainActivity.java 　　用户登录。

public class MainActivity extends Activity
    implements OnClickListener, OnCheckedChangeListener {
    //用于保存用户名
    public static String USER_NAME="";

    private SharedPreferences sp=null;
    private EditText etName=null;
    private EditText etPwd=null;
    private CheckBox cbRemember=null;
    private Button btnLogin=null;
    private ProgressBar pbLogin=null;

    private boolean remember=false;
    private String name="";
    private String pwd="";

    private UIHelper uiHelper=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //实例化UI
        initUI();

        //读取用户登录信息
        readSharedPreferences();

        cbRemember.setOnCheckedChangeListener(this);
        btnLogin.setOnClickListener(this);
    }

    @Override
    public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
        if(cbRemember.isChecked()){
            remember=true;
        }else{
            remember=false;
        }
    }

    @Override
    public void onClick(View arg0) {
        name=etName.getText().toString();
        pwd=etPwd.getText().toString();
        if(doValidateForm()){
            pbLogin.setVisibility(View.VISIBLE);
            //开启线程进行用户登录处理
            new Thread(new LoginThread()).start();
        }
    }

    private void initUI(){
        sp=this.getSharedPreferences("account", MODE_PRIVATE);

        etName=(EditText)findViewById(R.id.et_name);
        etPwd=(EditText)findViewById(R.id.et_pwd);
        cbRemember=(CheckBox)findViewById(R.id.cb_remember);
        btnLogin=(Button)findViewById(R.id.btn_login);
        pbLogin=(ProgressBar)findViewById(R.id.pb_login);

        uiHelper=new UIHelper(this);
    }

    private void readSharedPreferences(){
        String name=sp.getString("u_name", "");
        String pwd=sp.getString("u_pwd", "");
        etName.setText(name);
        etPwd.setText(pwd);
        if(!(name.equals("") &&pwd.equals(""))){
            remember=true;
            cbRemember.setChecked(true);
        }
    }

    private void saveSharedPreferences(){
        SharedPreferences.Editor editor=sp.edit();
        if(remember){//记住用户登录信息
            editor.putString("u_name", name);
            editor.putString("u_pwd", pwd);
            editor.commit();
        }else{
            editor.clear();
            editor.commit();
        }
    }

    //校验用户字段
    private boolean doValidateForm(){
        if(name.length()<1){
            uiHelper.ShortToast("用户名不能为空！");
            return false;
        }else if(pwd.length()<1){
            uiHelper.ShortToast("密码不能为空！");
            return false;
        }
        return true;
    }

    private Handler loginHandler=new Handler(){
        public void handleMessage(Message msg){
            pbLogin.setVisibility(View.GONE);
            //将登录结果提示给用户
            if(msg.what==100){
                String info="";
                String flag=(String)msg.obj;
                if(flag.equals("1")){
                    //info="登录成功！";
                    USER_NAME=name;
                    Intent intent=new Intent(MainActivity.this,OtherActivity.class);
                    startActivity(intent);
                    finish();
                    return;
                }else if(flag.equals("0")){
                    info="用户名或密码错误！";
                }else{
                    info="登录失败请稍后重试！";
                }
                uiHelper.ShortToast(info);
            }
        }
    };
    class LoginThread implements Runnable{
        public void run(){
            String url="http://192.168.0.116/android/login.php?name="+name+"&pwd="+pwd;
            String flag=NetHelper.doLogin(url);
            if(flag.equals("1")){
                //记住用户登录信息
                saveSharedPreferences();
            }
            loginHandler.obtainMessage(100, flag).sendToTarget();
        }
    }
}

（5）OtherActivity.java 主要用于用户登录成功后信息的显示

public class OtherActivity extends Activity {
    private TextView tvShow=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_other);
        tvShow=(TextView)findViewById(R.id.tv_show);

        tvShow.setText(MainActivity.USER_NAME);
    }
}

3：最后不要忘了在AndroidManifest.xml文件中添加：

<uses-permission android:name="android.permission.INTERNET" />