• Android PreferenceActivity添加Button、Textview控件


    因为PreferenceActivity加载的layout是以PreferenceScreen为底的,所以没办法在layout里面直接添加TextView之类的控件。

    此时可以把PreferenceScreen当做一个listview,放在另一个layout中:

    1. PreferenceScreen的layout,可以在其中添加一些类似CheckboxPreference

    preference_screen_layout.xml

    <?xml version="1.0" encoding="utf-8"?> <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" android:title="Change available services">
    <SwitchPreference
    android:key="key_screen_always_on"
    android:title="@string/screen_always_on_title"
    />

    <SwitchPreference
    android:key="sensors_enable"
    android:title="@string/enable_sensors_title"
    />
    </PreferenceScreen>

    2. 新加的layout,listview的ID用android内置的

    add_textview_layout.xml

    <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:id="@+id/service_status_textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="20dp" /> <ListView android:id="@android:id/list" android:layout_width="match_parent" android:layout_height="match_parent"/> </LinearLayout>

    3. PreferenceActivity中使用两个layout:

    @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.layout.preference_screen_layout);
            setContentView(R.layout.add_textview_layout);
    
            pScreen =  getPreferenceScreen();
            mTextView = (TextView) findViewById(R.id.service_status_textView);
            mContext = this.getApplicationContext();
        }

    pScreen可以在后面来管理activity中的preference,mTextView可以用来更新text。

    4. 另外,动态添加的CheckboxPreference需要update才能设置checked/unchecked。

    private void addCheckboxPreference() {
            CheckBoxPreference checkPreference = new CheckBoxPreference(mContext);
            otherServicePreference.setTitle(title);
            otherServicePreference.setIcon(icon);
            otherServicePreference.setKey(mKey);
            otherServicePreference.setPersistent(true);
            otherServicePreference.setDefaultValue(false);
            pScreen.addPreference(checkPreference);
    
            updatePreferenceStatus();
    }
     private void updatePreferenceStatus() {
            PreferenceScreen screen = getPreferenceScreen();
            final int preferenceCount = screen.getPreferenceCount();
            Log.i(TAG,"preferenceCount = "+preferenceCount);
            for (int i = 0; i < preferenceCount; i++) {
                Preference preference = screen.getPreference(i);
                mServicePreference = (CheckBoxPreference) findPreference(preference.getKey());
                mServicePreference.setChecked(true);
            }
    
        }
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  • 原文地址:https://www.cnblogs.com/kunkka/p/10062135.html
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