安卓sharedPreferece的應用學習筆記

渲染代碼

<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"
    tools:context="com.example.sd.MainActivity$PlaceholderFragment" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="用戶名" />
   <EditText 
       android:id="@+id/username"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="密碼" />
   	<EditText 
       android:id="@+id/password"
       android:inputType="textPassword"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
      />
   	<RelativeLayout 
   	    android:layout_width="fill_parent"
   	    android:layout_height="wrap_content"
   	    >
   	    <CheckBox 
   	        android:id="@+id/ck"
   	        android:checked="true"
   	        android:text="是否保存數據"
   	      	android:layout_width="wrap_content"
       		android:layout_height="wrap_content"
   	        />
   	    <Button 
   	        android:text="提交"
   	        android:id="@+id/bt"
   	        android:layout_alignParentRight="true"
   	        android:layout_width="wrap_content"
       		android:layout_height="wrap_content"
       		android:onClick="login"
   	        />
   	</RelativeLayout>
</LinearLayout>

MainActivity

package com.example.sharedpreferece;

import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;
import android.os.Build;

public class MainActivity extends Activity {
	EditText username;
	EditText password;
	CheckBox ck;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		username = (EditText) findViewById(R.id.username);
		password = (EditText) findViewById(R.id.password);
		ck = (CheckBox) findViewById(R.id.ck);
		SharedPreferences sp = getSharedPreferences("config", MODE_PRIVATE);
		String name = sp.getString("name", "");//第二個參數默認值
		String pass = sp.getString("pass", "");
		username.setText(name);
		password.setText(pass);
	}
	
	public void login(View v)
	{
		String name = username.getText().toString().trim();
		String pass = password.getText().toString().trim();
		if ("test".equals(name) && "123".equals(pass)) {
			if (ck.isChecked()) {
				SharedPreferences sp = this.getSharedPreferences("config", MODE_PRIVATE);
				 Editor et = sp.edit();
				 et.putString("name", name);
				 et.putString("pass", pass);
				 et.commit();
				 Toast.makeText(this, "登陸成功且寫入配置成功", Toast.LENGTH_SHORT).show();
			} else {
				Toast.makeText(this, "登陸成功", Toast.LENGTH_SHORT).show();
			}
		} else {
			Toast.makeText(this, "用戶名或密碼粗無", Toast.LENGTH_SHORT).show();
		}
	}
	
}