Android->登录界面

今天需求要做一个所有app都有的登录界面，正好巩固一下我们之前学的基础布局知识。

先来看下效果图

1.布局的xml文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout                   xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#2197db"
    >
 <ImageView
        android:id="@+id/loginbutton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="40dp"
        android:src="@drawable/login_pic"/>
    
<LinearLayout
        android:id="@+id/input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/loginbutton"
        android:layout_marginLeft="28dp"
        android:layout_marginRight="28dp"
        android:background="#fff"
        android:orientation="vertical">
<LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="44dp"
        android:background="#fff"
        android:gravity="center_vertical"
        android:orientation="horizontal" >

 <EditText
            android:id="@+id/userId"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:background="@null"
            android:imeOptions="actionDone"
            android:textSize="16sp"
            android:ems="10"
            android:hint="请输入用户名"
            >
   </EditText>
<Button
            android:id="@+id/button_bar"
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:layout_marginRight="8dp"
            android:layout_marginLeft="1dp"
            android:background="@drawable/login_input_arrow"
            />

  </LinearLayout>
 <View
            android:layout_width="fill_parent"
            android:layout_height="1.0px"
            android:layout_marginLeft="1.0px"
            android:layout_marginRight="1.0px"
            android:background="#ffc0c3c4" />
<EditText
            android:id="@+id/pass"
            android:layout_width="fill_parent"
            android:layout_height="44.0dip"
            android:background="#00ffffff"
            android:gravity="center_vertical"
            android:inputType="textPassword"
            android:maxLength="16"
            android:maxLines="1"
            android:textColor="#ff1d1d1d"
            android:textColorHint="#ff666666"
            android:textSize="16.0sp"
            android:hint="请输入密码"
            />
    </LinearLayout>
 <Button
      android:id="@+id/loginBtn"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_below="@+id/input"
      android:layout_marginTop="10dp"
      android:background="#3aadfd"
      android:text="登    录"
      android:textColor="#ffffff"
      android:textSize="18dp"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="28dp"
        android:layout_marginRight="28dp"/>
    <TextView
        android:text=""
        android:layout_width="wrap_content"
        android:layout_below="@+id/loginBtn"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:id="@+id/promptText"
        android:textColor="#ff0000"
        android:layout_marginTop="10dp"
        android:textSize="18sp"/>

</RelativeLayout>

2.java部分代码

public class LoginActivity extends Activity implements View.OnClickListener{
        private static final String TAG = "login";
            Button loginBtn = null;
            EditText useridEt = null;
            EditText passEt = null;
            TextView promptText = null;
          @Override
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        loginBtn = (Button) findViewById(R.id.loginBtn);
        loginBtn.setOnClickListener(this);
        useridEt = (EditText) findViewById(R.id.userId); 
        passEt = (EditText) findViewById(R.id.pass);
        promptText = (TextView) findViewById(R.id.promptText);
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .connectTimeout(10000L, TimeUnit.MILLISECONDS)
                .readTimeout(10000L, TimeUnit.MILLISECONDS)
                .build();
        OkHttpUtils.initClient(okHttpClient);

    @Override
    public void onClick(View v) {
        String userid =  useridEt.getText().toString().trim();
        String pass =  passEt.getText().toString().trim();
        if(userid.equals("")){
            promptText.setText(R.string.userIdError);
            return ;
        }
        if(pass.equals("")){
            promptText.setText(R.string.passError);
            return ;
        }
 WebConstant.digest = ("Basic " + new String(Base64.encode((userid + ':' + pass).getBytes(), Base64.DEFAULT))).replace("
", "");

            String url = WebConstant.REQUESTPATH+"/users/" + userid+"?getAll=true";
            OkHttpUtils.get()
                    .url(url).addHeader("Authorization",  WebConstant.digest).addHeader("Accept-Language","zh-CN")
                    .build().execute(new Callback()
                    {
                        @Override
                        public String parseNetworkResponse(Response response, int id) throws Exception {
                            String string = response.body().string();
                            JSONObject jsonObj = new JSONObject(string);
                            if(jsonObj.get("userName")!=null){
                                WebConstant.userId = (String)jsonObj.get("userId");
                                WebConstant.userName = (String)jsonObj.get("userName");
                                return (String) jsonObj.get("userName");
                            }
                            return null;
                        }

                        @Override
                        public void onError(Call call, Exception e, int id) {
                            WebConstant.digest = null;
                            promptText.setText(R.string.loginError);
                            Log.i(TAG,e.getMessage());
                            e.printStackTrace();
                        }

                        @Override
                        public void onResponse(Object response, int id) {
                            promptText.setText(R.string.loginSuccess+" "+response);
                            Intent intent = new Intent();
                            LoginActivity.this.setResult(WebConstant.RESULT_OK, intent);
                            LoginActivity.this.finish();
                        }
                    });

    }
}        

简单的登录，用户名密码验证。

主要是熟悉安卓的布局，java部分相信会点java的同学都能看懂，看不懂的底下评论。