SharedPreferences的使用

首先 getSharedPreferences()方法的得到SharedPreferences對象

調用SharedPreferences的edit()方法得到Editor對象編輯器

在調用Editor對象的方法進行存值，最後記得調用Editor對象的commit()方法提交

<?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" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:text="用戶名" />

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

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="@android:color/darker_gray" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:text="密碼" />

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

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="@android:color/darker_gray" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:text="亮度" />

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

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="@android:color/darker_gray" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:orientation="horizontal" >

        <CheckBox
            android:id="@+id/cb_auto"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="開機是否啓動" />
    </LinearLayout>

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="@android:color/darker_gray" />
    
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:orientation="horizontal" 
        >

        <Button
            android:id="@+id/bt_save"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="保存" />
        <Button
            android:id="@+id/bt_show"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="顯示" />

    </LinearLayout>


</LinearLayout>

 

public class MainActivity extends Activity implements OnClickListener{
    private SharedPreferences sp;
	private EditText et_name;
	private EditText et_password;
	private EditText et_light;
	private CheckBox cb_auto;

	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        
        initView();
        
        
        
    }

	private void initView() {
		et_name = (EditText) findViewById(R.id.et_name);
		et_password = (EditText) findViewById(R.id.et_password);
		et_light = (EditText) findViewById(R.id.et_light);
		
		cb_auto = (CheckBox) findViewById(R.id.cb_auto);
		
		Button bt_save = (Button) findViewById(R.id.bt_save);
		Button bt_show = (Button) findViewById(R.id.bt_show);
		
		bt_save.setOnClickListener(this);
		bt_show.setOnClickListener(this);
		
		//得到共享首選項
        sp = getSharedPreferences("config", Context.MODE_PRIVATE);
        
        
	}

	public void onClick(View v) {
		// TODO Auto-generated method stub
		int id = v.getId();
		switch (id) {
		case R.id.bt_save:
			//獲取值
			String name = et_name.getText().toString();
			String password = et_password.getText().toString();
			int light = Integer.parseInt(et_light.getText().toString());
			boolean auto = cb_auto.isChecked();
			
			//保存數據
			Editor editor = sp.edit();
			editor.putString("name", name);
			editor.putString("password", password);
			editor.putInt("light", light);
			editor.putBoolean("auto", auto);
			//提交
			editor.commit();
			
			
			break;
		case R.id.bt_show:
			
			name = sp.getString("name", "張三");
			password = sp.getString("password", "");
			light = sp.getInt("light", 15);
			auto = sp.getBoolean("auto", true);
			
			et_name.setText(name);
			et_password.setText(password);
			et_light.setText(light+"");
			cb_auto.setChecked(auto);
			break;

		default:
			break;
		}
	}
}