android开发用户和密码登陆

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绪论

首先记住密码功能要用到SharedPreferences类，这个类不仅可以实现简单的存储，还主要用于保存窗口状态等等。

结果图如下：

代码

Welcome.java

package com.gxs.login;
import com.example.login.R;
import com.gxs.listview.*;
import android.os.Bundle;
import android.preference.Preference;
import android.app.Activity;
import android.app.SearchManager.OnCancelListener;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class Welcome extends Activity implements OnClickListener{
private EditText uname = null;
private EditText upswd = null;
private CheckBox checkbox = null;
private Button login = null;
SharedPreferences sp = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout_main);
        sp = this.getSharedPreferences("userinfo", Context.MODE_PRIVATE);
        init();

    }

    public void init()
{
  uname = (EditText) findViewById(R.id.user_input);
  upswd = (EditText) findViewById(R.id.pass_input);
  checkbox = (CheckBox) findViewById(R.id.checkBoxLogin);
     login = (Button) findViewById(R.id.new_user);
     if (sp.getBoolean("auto", false))
     {
        uname.setText(sp.getString("uname", null));
        upswd.setText(sp.getString("upswd", null));
        checkbox.setChecked(true);

     }
     login.setOnClickListener(this);
}

@Override
public void onClick(View v) {
  if (v == login){
   String name = uname.getText().toString();
   String pswd = upswd.getText().toString();
   if(name.trim().equals("")){
       Toast.makeText(this, "请您输入用户名！", Toast.LENGTH_SHORT).show();
    return;
      }
      if(pswd.trim().equals("")){
       Toast.makeText(this, "请您输入密码！", Toast.LENGTH_SHORT).show();
    return;
      }
   boolean autoLogin = checkbox.isChecked();
   if (autoLogin)
   {
     Editor editor = sp.edit();
     editor.putString("uname", name);
     editor.putString("upswd", pswd);
     editor.putBoolean("auto", true);
     editor.commit();
   }
   else
   {
    Editor editor = sp.edit();
    editor.putString("uname", null);
    editor.putString("upswd", null);
    editor.putBoolean("auto", false);
    editor.commit();
    }
   //Intent跳转语句
   Intent intent = new Intent(Welcome.this,Content.class);
   startActivity(intent);
   finish();
  }

}

}

Content.java

package com.gxs.listview;
import java.util.List;

import com.example.login.R;
import com.gxs.*;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Content extends Activity{
private ListView listview_fruits;
@Override
protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.content);

}
}

layout_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#ADD8E6">

</RelativeLayout>

     </LinearLayout>

</LinearLayout>

content.xml

</LinearLayout>

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