已尽力：
运行效果图：
MainActivity.java代码不需改变；；
；
新建LoginActivity.java的：
package com.example.minitwittersimulate; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.Button; import android.widget.CheckBox; import android.widget.EditText; import android.widget.Toast; public class LoginActivity extends Activity { private SharedPreferences pref; private SharedPreferences.Editor editor; private EditText accountEdit; private EditText passwordEdit; private Button login; private CheckBox rememberPass; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_login); pref = PreferenceManager.getDefaultSharedPreferences(this); accountEdit = (EditText) findViewById(R.id.etUsername); passwordEdit = (EditText) findViewById(R.id.etPassword); rememberPass = (CheckBox) findViewById(R.id.cbRememberPass); login = (Button) findViewById(R.id.btnLogin); boolean isRemember = pref.getBoolean("remember_password", false); if (isRemember) { // 将账号和密码都设置到文本框中 String account = pref.getString("account", ""); String password = pref.getString("password", ""); accountEdit.setText(account); passwordEdit.setText(password); rememberPass.setChecked(true); } login.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String account = accountEdit.getText().toString(); String password = passwordEdit.getText().toString(); if (account.equals("admin") && password.equals("123456")) { editor = pref.edit(); if (rememberPass.isChecked()) { // 检查复选框是否被选中 editor.putBoolean("remember_password", true); editor.putString("account", account); editor.putString("password", password); } else { editor.clear(); } editor.commit(); Intent intent = new Intent(LoginActivity.this, MainActivity.class); startActivity(intent); finish(); } else { Toast.makeText(LoginActivity.this, "account or password is invalid", Toast.LENGTH_SHORT).show(); } } }); } }新建login_top.xml的 代码：
<?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="wrap_content" android:background="@drawable/btnbg_roundcorner" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" > <TextView android:id="@+id/tvUsername" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:text="@string/tvName" android:textAppearance="?android:attr/textAppearanceMedium" /> <EditText android:id="@+id/etUsername" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignLeft="@+id/tvUsername" android:layout_below="@+id/tvUsername" android:background="@android:drawable/edit_text" android:ems="10" > <requestFocus /> </EditText> <TextView android:id="@+id/tvPassword" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/etUsername" android:layout_below="@+id/etUsername" android:text="@string/tvPassword" android:textAppearance="?android:attr/textAppearanceMedium" /> <EditText android:id="@+id/etPassword" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignLeft="@+id/tvPassword" android:layout_below="@+id/tvPassword" android:background="@android:drawable/edit_text" android:ems="10" android:inputType="textPassword" /> <CheckBox android:id="@+id/cbRememberPass" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/btnLogin" android:layout_alignBottom="@+id/btnLogin" android:layout_alignLeft="@+id/etPassword" android:text="记住密码" android:textSize="20sp" /> <Button android:id="@+id/btnLogin" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignRight="@+id/etPassword" android:layout_below="@+id/etPassword" android:background="#FF72CAE1" android:onClick="login" android:text="@string/btnLogin" /> </RelativeLayout>新建login_botton.xml的代码：
<?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="wrap_content" > <TextView android:id="@+id/tvRegist" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginLeft="21dp" android:layout_marginTop="18dp" android:text="@string/tvRegister" android:autoLink="all" android:textColorLink="#FFFF66CC" /> <ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:layout_marginBottom="24dp" android:src="@drawable/panda" /> <ImageView android:id="@+id/imageView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:layout_marginBottom="28dp" android:src="@drawable/icon" /> </RelativeLayout>
新建 activity_login.xml代码:
<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" android:background="@drawable/loginbg" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".LoginActivity" > <include layout="@layout/login_top"/> <include layout="@layout/login_bottom"/>" </LinearLayout>
