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("\n", ""); 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。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。