android 如何实现登陆界面的记住密码功能

今天 写了一个有关登录记住密码的列子 其实这个例子的关键使用到了AutoCompleteTextView 以及sharedPreference的两个关键知识点,大家知道 AutoCompleteTextView 他的默认字体颜色以及背景颜色都是白色 所以我们要对下拉菜单的textview进行颜色定义区分好 我们先来看怎么区分的

list_item.xml

 

<?xml version="1.0" encoding="utf-8"?>

    
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:padding="10dp" 
    android:textSize="16sp" 
    android:textColor="#000"> 
</TextView>
接下来是重点哦
/*author: conowen
 * date: 2012.4.2
 * 
 */
package com.hipikids.remeber;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.Editable;
import android.text.InputType;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class RemeberPwdActivity extends Activity {

	AutoCompleteTextView cardNumAuto;
	EditText passwordET;
	Button logBT;

	CheckBox savePasswordCB;
	SharedPreferences sp;
	String cardNumStr;
	String passwordStr;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_remeber_pwd);
		cardNumAuto = (AutoCompleteTextView) findViewById(R.id.cardNumAuto);
		passwordET = (EditText) findViewById(R.id.passwordET);
		logBT = (Button) findViewById(R.id.logBT);

		sp = this.getSharedPreferences("passwordFile", MODE_PRIVATE);
		savePasswordCB = (CheckBox) findViewById(R.id.savePasswordCB);
		savePasswordCB.setChecked(true);// 默认为记住密码
		cardNumAuto.setThreshold(1);// 输入1个字母就开始自动提示
		passwordET.setInputType(InputType.TYPE_CLASS_TEXT
				| InputType.TYPE_TEXT_VARIATION_PASSWORD);
		// 隐藏密码为InputType.TYPE_TEXT_VARIATION_PASSWORD,也就是0x81
		// 显示密码为InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD,也就是0x91

		cardNumAuto.addTextChangedListener(new TextWatcher() {

			@Override
			public void onTextChanged(CharSequence s, int start, int before,
					int count) {
				// TODO Auto-generated method stub
				String[] allUserName = new String[sp.getAll().size()];// sp.getAll().size()返回的是有多少个键值对
				allUserName = sp.getAll().keySet().toArray(new String[0]);
				// sp.getAll()返回一张hash map
				// keySet()得到的是a set of the keys.
				// hash map是由key-value组成的

				ArrayAdapter<String> adapter = new ArrayAdapter<String>(
						RemeberPwdActivity.this,
						R.layout.list_item,
						allUserName);

				cardNumAuto.setAdapter(adapter);// 设置数据适配器

			}

			@Override
			public void beforeTextChanged(CharSequence s, int start, int count,
					int after) {
				// TODO Auto-generated method stub

			}

			@Override
			public void afterTextChanged(Editable s) {
				// TODO Auto-generated method stub
				passwordET.setText(sp.getString(cardNumAuto.getText()
						.toString(), ""));// 自动输入密码

			}
		});

		// 登陆
		logBT.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub

				cardNumStr = cardNumAuto.getText().toString();
				passwordStr = passwordET.getText().toString();
  
				if (!((cardNumStr.equals("test")) && (passwordStr
						.equals("test")))) {
					Toast.makeText(RemeberPwdActivity.this, "密码 误,请重新输入",
							Toast.LENGTH_SHORT).show();
				} else {
					if (savePasswordCB.isChecked()) {// 登陆成功才保存密码
						sp.edit().putString(cardNumStr, passwordStr).commit();
					}
					Toast.makeText(RemeberPwdActivity.this, "登陆成功,正在获取用户数据……",
							Toast.LENGTH_SHORT).show();
					// 跳转到另一个Activity
					// do something

				}

			}
		});

	}

}
activity_remeber_pwd.xml
<?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:orientation="vertical"
    android:background="@drawable/ic_launcher" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="简单登陆DEMO"
        android:textSize="25px" />

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="250dip"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="15dp"
            android:orientation="vertical" >

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal" >

                <LinearLayout
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical" >

                    <LinearLayout
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:orientation="horizontal" >

                        <TextView
                            android:id="@+id/tv_account"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginRight="10dp"
                            android:text="用  户  名:"
                            android:textSize="15px" />

                        <AutoCompleteTextView
                            android:id="@+id/cardNumAuto"
                            android:textColor="#000000"
                            android:layout_width="fill_parent"
                            android:layout_height="wrap_content" >
                        </AutoCompleteTextView>
                    </LinearLayout>

                    <LinearLayout
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:orientation="horizontal" >

                        <TextView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginRight="10dp"
                            android:text="用户密码:"
                            android:textSize="15px" />

                        <EditText
                            android:id="@+id/passwordET"
                            android:layout_width="fill_parent"
                            android:layout_height="wrap_content" >
                        </EditText>
                    </LinearLayout>
                </LinearLayout>
            </LinearLayout>

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="horizontal" >

                <CheckBox
                    android:id="@+id/savePasswordCB"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="20dp"
                    android:text="记住密码" >
                </CheckBox>

                <Button
                    android:id="@+id/logBT"
                    android:layout_width="100px"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="40dp"
                    android:layout_marginRight="10dp"
                    android:text="登录" >
                </Button>
            </LinearLayout>
        </LinearLayout>
    </LinearLayout>

</LinearLayout>

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