8.1 Android Basic 数据存储 Preferences Structured(分组的Preferences)

<<PrefsDemo_Structured.zip>>

   

Structured(分组的Prefereces)

   

• 新建项目 ProfsDemo_Structured. 编辑res/layout/main.xml布局文件

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

  <TableLayout xmlns:android="http://schemas.android.com/apk/res/android"

  android:layout_width="fill_parent" android:layout_height="fill_parent">

  <TableRow>

  <TextView android:text="Checkbox:" android:paddingRight="5px" />

  <TextView android:id="@+id/checkbox" />

  </TableRow>

  <TableRow>

  <TextView android:text="Ringtone:" android:paddingRight="5px" />

  <TextView android:id="@+id/ringtone" />

  </TableRow>

  <TableRow>

  <TextView android:text="Checkbox #2:" android:paddingRight="5px" />

  <TextView android:id="@+id/checkbox2" />

  </TableRow>

  </TableLayout>

     

  2. 在res/新建目录xml 在xml目录下新建preferences.xml 布局文件:

     

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

  <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

  <PreferenceCategory android:title="简单配置">

  <CheckBoxPreference android:summary="CheckBox1 的描述" android:key="checkbox" android:title="CheckBox1"></CheckBoxPreference>

  <RingtonePreference android:title="铃声配置"

  android:key="ringtone" android:showDefault="true" android:showSilent="true"></RingtonePreference>

  </PreferenceCategory>

  <PreferenceCategory android:title="详细配置">

  <PreferenceScreen android:key="detail" android:title="详细"

  android:summary="附加的配置在另一页上">

  <CheckBoxPreference android:summary="CheckBox状态描述"

  android:key="checkbox2" android:title="另一个CheckBox"></CheckBoxPreference>

  </PreferenceScreen>

  </PreferenceCategory>

  </PreferenceScreen>

     

  3. 添加类EditPreferences 继承自 PreferenceActivity类

  import android.os.Bundle;

  import android.preference.PreferenceActivity;

     

  public class EditPreferences extends PreferenceActivity {

     

  @Override

  protected void onCreate(Bundle savedInstanceState) {

  // TODO Auto-generated method stub

  super.onCreate(savedInstanceState);

  addPreferencesFromResource(R.xml.preferences);

  }

     

  }

     

  4. 编辑PrefsDemo_Structured 类

  import android.app.Activity;

  import android.content.Intent;

  import android.content.SharedPreferences;

  import android.os.Bundle;

  import android.preference.PreferenceManager;

  import android.view.Menu;

  import android.view.MenuItem;

  import android.widget.TextView;

     

  public class PrefsDemo_Structured extends Activity {

  private static final int EDIT_ID = Menu.FIRST+2;

  private TextView checkbox = null;

  private TextView ringtone = null;

  private TextView checkbox2 = null;

  @Override

  public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

  checkbox = (TextView)findViewById(R.id.checkbox);

  ringtone = (TextView)findViewById(R.id.ringtone);

  checkbox2 = (TextView)findViewById(R.id.checkbox2);

  }

     

  @Override

  public boolean onCreateOptionsMenu(Menu menu) {

  menu.add(Menu.NONE,EDIT_ID,Menu.NONE,"设置").setAlphabeticShortcut('e');

  return super.onCreateOptionsMenu(menu);

  }

     

  @Override

  public boolean onOptionsItemSelected(MenuItem item) {

  switch(item.getItemId()){

  case EDIT_ID:

  startActivity(new Intent(this,EditPreferences.class));

  return true;

  }

  return super.onOptionsItemSelected(item);

  }

     

  @Override

  protected void onResume() {

  // TODO Auto-generated method stub

  super.onResume();

  SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);

  checkbox.setText(new Boolean(prefs.getBoolean("checkbox", false)).toString());

  ringtone.setText(prefs.getString("ringtone", "未设置"));

  checkbox2.setText(new Boolean(prefs.getBoolean("checkbox2", false)).toString());

  }

     

  }

     

  创建设置菜单，启动配置Activity屏幕。在onResume()方法中获取配置的信息。

     

  5. 在AndroidMainfest.xml中添加配置

  <activity android:name="EditPreferences"></activity>