我们使用的一般应用都有记住密码、自动登录功能,这样不用用户每次都要点击登录按钮,提升用户体验,下面我们通过一个实例研究一下如何通过android的sharedpreferenced实现自动登录功能。本实例有三个界面-登录界面,跳转界面,登录成功界面。
1.登录界面:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/logo_bg" android:orientation="vertical" > <RelativeLayout android:layout_width="fill_parent" android:layout_height="wrap_content" > <ImageButton android:id="@+id/img_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:background="@drawable/quit" /> <TextView android:id="@+id/tv_zh" android:layout_width="wrap_content" android:layout_height="35dip" android:layout_marginLeft="12dip" android:layout_marginTop="10dip" android:gravity="bottom" android:text="帐号:" android:textColor="#000000" android:textSize="18sp" /> <EditText android:id="@+id/et_zh" android:layout_width="fill_parent" android:layout_height="40dip" android:layout_below="@id/tv_zh" android:layout_marginLeft="12dip" android:layout_marginRight="10dip" /> <TextView android:id="@+id/tv_mima" android:layout_width="wrap_content" android:layout_height="35dip" android:layout_below="@id/et_zh" android:layout_marginLeft="12dip" android:layout_marginTop="10dip" android:gravity="bottom" android:text="密码:" android:textColor="#000000" android:textSize="18sp" /> <EditText android:id="@+id/et_mima" android:layout_width="fill_parent" android:layout_height="40dip" android:layout_below="@id/tv_mima" android:layout_marginLeft="12dip" android:layout_marginRight="10dip" android:maxLines="200" android:password="true" android:scrollHorizontally="true" /> <CheckBox android:id="@+id/cb_auto" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/et_mima" android:layout_marginLeft="12dip" android:text="自动登录" android:textColor="#000000" /> <Button android:id="@+id/btn_mima" android:layout_width="100dip" android:layout_height="40dip" android:layout_below="@id/cb_auto" android:layout_marginLeft="12dip" android:gravity="center" android:text="忘记密码" android:textColor="#000000" android:textSize="18sp" /> <Button android:id="@+id/btn_login" android:layout_width="80dip" android:layout_height="40dip" android:layout_alignRight="@+id/et_mima" android:layout_below="@+id/cb_auto" android:gravity="center" android:text="登录" android:textColor="#000000" android:textSize="18sp" /> </RelativeLayout> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/logo_bg" android:orientation="vertical" > <RelativeLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="3"> <ProgressBar android:id="@+id/pgBar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" /> <TextView android:id="@+id/tv1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/pgBar" android:layout_centerHorizontal="true" android:text="正在登录..." android:textColor="#000000" android:textSize="18sp" /> </RelativeLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:orientation="vertical" > <Button android:id="@+id/btn_back" android:layout_width="70dip" android:layout_height="35dip" android:text="取消" android:textColor="#000000" android:textSize="12sp" /> </LinearLayout> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_gravity="center" android:background="@drawable/login_bg" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:text="登陆成功,进入用户界面" android:textColor="#000000" android:textSize="20sp" /> </LinearLayout>
LoginActivity.java:
package com.liu.activity; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.EditText; import android.widget.ImageButton; import android.widget.Toast; public class LoginActivity extends Activity { private EditText userName, password; private CheckBox auto_login; private Button btn_login, btn_forget_pass; private ImageButton btnQuit; private String userNameValue, passwordValue; private SharedPreferences sp; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 去除标题 this.requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.login); // 获得实例对象 sp = this.getSharedPreferences("userInfo", Context.MODE_WORLD_READABLE); userName = (EditText) findViewById(R.id.et_zh); password = (EditText) findViewById(R.id.et_mima); btn_forget_pass = (Button) findViewById(R.id.btn_mima); auto_login = (CheckBox) findViewById(R.id.cb_auto); btn_login = (Button) findViewById(R.id.btn_login); btnQuit = (ImageButton) findViewById(R.id.img_btn); // 判断记住密码多选框的状态 if (sp.getBoolean("AUTO_ISCHECK", false)) { // 设置默认是记录密码状态 userName.setText(sp.getString("USER_NAME", "")); password.setText(sp.getString("PASSWORD", "")); }else if(sp.getBoolean("AUTO_ISCHECK", true)){ Intent intent = new Intent(LoginActivity.this, JumpActivity.class); LoginActivity.this.startActivity(intent); LoginActivity.this.finish(); auto_login.setChecked(true); } // 登录监听事件 现在默认为用户名为:yayun 密码:123 btn_login.setOnClickListener(new OnClickListener() { public void onClick(View v) { userNameValue = userName.getText().toString(); passwordValue = password.getText().toString(); if (userNameValue.equals("yayun") && passwordValue.equals("123")) { Toast.makeText(LoginActivity.this, "登录成功", Toast.LENGTH_SHORT).show(); // 登录成功和记住密码框为选中状态才保存用户信息 if (auto_login.isChecked()) { // 记住用户名、密码、 Editor editor = sp.edit(); editor.putString("USER_NAME", userNameValue); editor.putString("PASSWORD", passwordValue); editor.commit(); } // 跳转界面 Intent intent = new Intent(LoginActivity.this, JumpActivity.class); LoginActivity.this.startActivity(intent); LoginActivity.this.finish(); } else { Toast.makeText(LoginActivity.this, "用户名或密码错误,请重新登录", Toast.LENGTH_LONG).show(); } } }); // 监听记住密码多选框按钮事件 auto_login.setOnCheckedChangeListener(new OnCheckedChangeListener() { public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if (auto_login.isChecked()) { System.out.println("记住密码已选中"); sp.edit().putBoolean("AUTO_ISCHECK", true).commit(); } else { System.out.println("记住密码没有选中"); sp.edit().putBoolean("AUTO_ISCHECK", false).commit(); } } }); btnQuit.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { LoginActivity.this.finish(); } }); } }
package com.liu.activity; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.Button; import android.widget.ProgressBar; public class JumpActivity extends Activity { private ProgressBar progressBar; private Button backButton; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 去除标题 this.requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.jump); progressBar = (ProgressBar) findViewById(R.id.pgBar); backButton = (Button) findViewById(R.id.btn_back); startWelcomeAvtivity(); backButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { JumpActivity.this.finish(); } }); } private void startWelcomeAvtivity() { new Handler().postDelayed(new Runnable() {//延迟操作 public void run() { Intent intent = new Intent(JumpActivity.this, WelcomeAvtivity.class); JumpActivity.this.startActivity(intent); JumpActivity.this.finish(); } },2000);// 设置执行时间2秒 } }3.Welcome.java:
package com.liu.activity; import android.app.Activity; import android.os.Bundle; public class WelcomeAvtivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.welcome); } }运行实例:
这时应该记录住密码,可以自行自动登录了,我们测试一下,退出应用后再次进入,如下:
如果你想更完善一些,可以自己做一个登出的操作哦!
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