8.1 Android Basic 数据存储 Preferences Dialog(使用对话框的Preferences)

<<PrefsDemo_Dialog.zip>>

   

Dialog(使用对话框的Preferences)

   

• 新建项目 PrefsDemo_Dialog 编辑res/layout/main.xml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>

  <TableRow>

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

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

  </TableRow>

  <TableRow>

  <TextView android:text="List Selection:"

  android:paddingRight="5px" />

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

  </TableRow>

  </TableLayout>

     

  2. 在res/新建xml目，在xml目录下新建preferneces.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="简单的配置">

  <CheckBoxPreference android:summary="CheckBox说明说明"

  android:key="checkbox" android:title="Checkbox配置"></CheckBoxPreference>

  <RingtonePreference android:title="铃声设置"

  android:key="ringtone" android:summary="请选铃声....."

  android:ringtoneType="ringtone|notification|alarm|all"

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

  </PreferenceCategory>

  <PreferenceCategory android:title="详细页">

  <PreferenceScreen android:key="detail" android:title="Detail Screen"

  android:summary="Additional preferences held in another page">

  <CheckBoxPreference android:summary="另一个CheckBox"

  android:key="checkbox2" android:title="CheckBox2配置"></CheckBoxPreference>

  </PreferenceScreen>

  </PreferenceCategory>

  <PreferenceCategory android:title="其他配置">

  <EditTextPreference

  android:key="text"

  android:title="Text Entry Dialog"

  android:summary="Click to pop up a field for entry"

  android:dialogTitle="Enter something useful"

  />

  <ListPreference android:title="Selection Dialog"

  android:entryValues="@array/airport_codes" android:entries="@array/cities"

  android:key="list" android:summary="Click to pop up a list a choose from"

  android:dialogTitle="Choose a City"></ListPreference>

  </PreferenceCategory>

  </PreferenceScreen>

     

  3. 添加EditProferences类继承自ProferencesActivity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. 修改 ProfsDemo_Dialog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_Dialog extends Activity {

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

     

  private TextView checkbox = null;

  private TextView ringtone = null;

  private TextView checkbox2 = null;

  private TextView text = null;

  private TextView list = 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);

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

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

  }

     

  @Override

  public boolean onCreateOptionsMenu(Menu menu) {

  menu.add(Menu.NONE, EDIT_ID, Menu.NONE, "Edit Prefs")

  .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", "<unset>"));

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

  .toString());

  text.setText(prefs.getString("text", "<unset>"));

  list.setText(prefs.getString("list", "<unset>"));

  }

  }

     

  5. 在AndroidManifest.xml中配置EditPreferences Activity

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