implement checklist mode for task description

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

<org.dmfs.tasks.widget.CheckListFieldEditor xmlns:android="http://schemas.android.com/apk/res/android"

    style="@style/task_widget" >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal" >

        <TextView

            android:id="@android:id/title"

            style="@style/editor_label_text"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_marginBottom="-8dip"

            android:layout_weight="1"

            android:ellipsize="marquee"

            android:fadingEdge="horizontal"

            android:paddingLeft="12dip"

            android:singleLine="true" />

        <CheckBox

            android:id="@+id/checklist_mode_switch"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content" />

    </LinearLayout>

    <EditText

        android:id="@android:id/text1"

        style="@style/field_editor_text_value"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:inputType="textMultiLine"

        android:singleLine="false"

        android:textAllCaps="false" >

    </EditText>

    <LinearLayout

        android:id="@+id/checklist"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="vertical"

        android:visibility="gone" >

        <!-- Add empty element -->

        <include layout="@layout/checklist_field_editor_element" />

    </LinearLayout>

</org.dmfs.tasks.widget.CheckListFieldEditor>

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<?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="wrap_content"

    android:gravity="center_vertical"

    android:orientation="horizontal" >

    <CheckBox

        android:id="@android:id/checkbox"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" />

    <EditText

        android:id="@android:id/text1"

        style="@style/field_editor_text_value"

        android:layout_width="0dp"

        android:layout_height="wrap_content"

        android:layout_weight="1"

        android:inputType="text"

        android:singleLine="true"

        android:textAllCaps="false" >

    </EditText>

</LinearLayout>

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

<org.dmfs.tasks.widget.CheckListFieldView xmlns:android="http://schemas.android.com/apk/res/android"

    style="@style/task_widget"

    android:visibility="gone" >

    <include layout="@layout/detail_header" />

    <TextView

        android:id="@+id/text"

        style="@style/field_view_text_value"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:autoLink="all" >

    </TextView>

    <LinearLayout

        android:id="@+id/checklist"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="vertical" >

    </LinearLayout>

</org.dmfs.tasks.widget.CheckListFieldView>

 No newline at end of file

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

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

    android:id="@android:id/checkbox"

    style="@style/dark_text"

    android:layout_width="match_parent"

    android:layout_height="wrap_content" />

        </LinearLayout>

        <LinearLayout

            android:id="@+id/content"

            android:id="@+id/checklist"

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:orientation="vertical" >