Android中自定义Preference

一、需求

开发横屏设备的app时，发现preference显示的都是上下结构，因此需要自定义preference实现横屏显示。

二、layout实现

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="horizontal"
              android:layout_width="match_parent"
              android:layout_height="wrap_content">

    <TextView
        android:id="@+id/title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_margin="@dimen/space_horizontal"
        android:layout_gravity="center"
        android:gravity="start"
        android:textColor="@color/text_font_black"
        android:textSize="@dimen/font_size_prompt"/>

    <CheckBox
        android:id="@+id/checkBox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/space_horizontal"
        android:layout_gravity="center"
        android:button="@drawable/selection_switch_check_box_background"
        android:visibility="gone"/>

    <TextView
        android:id="@+id/summary"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/space_horizontal"
        android:layout_gravity="center"
        android:gravity="end"/>

</LinearLayout>

三、EditTextPreference

public class EditTextPreferenceFix extends EditTextPreference {

    public EditTextPreferenceFix(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        super.onDialogClosed(positiveResult);
        getEditText().clearFocus();
        hideSysInput();
    }

    @Override
    protected View onCreateView(ViewGroup parent) {
        super.onCreateView(parent);
        return LayoutInflater.from(getContext()).inflate(R.layout.layout_preference,
                parent, false);
    }

    @Override
    protected void onBindView(View view) {
        super.onBindView(view);
        TextView titleView = (TextView) view.findViewById(R.id.title);
        titleView.setText(getTitle());
        TextView summaryView = (TextView) view.findViewById(R.id.summary);
        summaryView.setText(getSummary());
    }

    private void hideSysInput() {
        Window window = ((Activity) getContext()).getWindow();
        View contentView = window.findViewById(Window.ID_ANDROID_CONTENT);

        if (contentView.getWindowToken() != null) {
            ViewUtils.hideSystemKeyboard(getContext(), contentView);
        }
    }
}

四、ListPreference

public class ListPreferenceFix extends ListPreference {

    public ListPreferenceFix(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        super.onDialogClosed(positiveResult);
        hideSysInput();
    }

    @Override
    protected View onCreateView(ViewGroup parent) {
        super.onCreateView(parent);
        return LayoutInflater.from(getContext()).inflate(R.layout.layout_preference,
                parent, false);
    }

    @Override
    protected void onBindView(View view) {
        super.onBindView(view);
        TextView titleView = (TextView) view.findViewById(R.id.title);
        titleView.setText(getTitle());
        TextView summaryView = (TextView) view.findViewById(R.id.summary);
        summaryView.setText(getSummary());
    }

    private void hideSysInput() {
        Window window = ((Activity) getContext()).getWindow();
        View contentView = window.findViewById(Window.ID_ANDROID_CONTENT);

        if (contentView.getWindowToken() != null) {
            ViewUtils.hideSystemKeyboard(getContext(), contentView);
        }
    }
}

五、CheckBoxPreference

public class CheckBoxPreferenceFix extends CheckBoxPreference {

    public CheckBoxPreferenceFix(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected View onCreateView(ViewGroup parent) {
        super.onCreateView(parent);
        return LayoutInflater.from(getContext()).inflate(R.layout.layout_preference,
                parent, false);
    }

    @Override
    protected void onBindView(View view) {
        super.onBindView(view);
        TextView titleView = (TextView) view.findViewById(R.id.title);
        CheckBox checkBox = (CheckBox) view.findViewById(R.id.checkBox);
        TextView summaryView = (TextView) view.findViewById(R.id.summary);
        titleView.setText(getTitle());
        checkBox.setVisibility(View.VISIBLE);
        checkBox.setChecked(isChecked());
        summaryView.setText(isChecked() ? getSummaryOn() : getSummaryOff());
        checkBox.setOnCheckedChangeListener((buttonView, isChecked) -> {
            summaryView.setText(isChecked ? getSummaryOn() : getSummaryOff());
            setChecked(isChecked);
        });
    }
}

六、XML文件

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

    <com.pax.view.ListPreferenceFix
        android:defaultValue="@string/wifi"
        android:dialogTitle="@string/commParam_menu_comm_mode_choose"
        android:entries="@array/commParam_menu_comm_mode_list_entries"
        android:entryValues="@array/commParam_menu_comm_mode_values_list_entries"
        android:key="@string/COMM_TYPE"
        android:negativeButtonText="@null"
        android:positiveButtonText="@null"
        android:title="@string/commParam_menu_comm_mode"/>
    <!-- 打开一个sub screen 移动网络-->
    <PreferenceCategory
        android:persistent="false"
        android:title="@string/communication_menu_mobile">
        <com.pax.view.CheckBoxPreferenceFix
            android:defaultValue="true"
            android:key="@string/MOBILE_KEEP_ALIVE"
            android:summaryOff="@string/no"
            android:summaryOn="@string/yes"
            android:title="@string/commParam_menu_mobile_wifi_keep_alive"/>
        <com.pax.view.EditTextPreferenceFix
            android:capitalize="words"
            android:key="@string/MOBILE_TEL_NO"
            android:maxLines="1"
            android:selectAllOnFocus="true"
            android:singleLine="true"
            android:title="@string/commParam_menu_mobile_dial_no"/>

    </PreferenceCategory>

</PreferenceScreen>