标签：android   preference   spinner   widget   布局   

因客户需求SpinnerPreference，网上各种搜索不到，无奈只能重写组件，现将过程分享大家。

自定义SpinnerPreference

一：首先从扩展preference开始：类文件必须继承自Preference并实现构造函数，如下

public MySpinnerPreference(Context context) {
        super(context);
    }

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

    public MySpinnerPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

二：自定义布局文件的重写

<?xml version="1.0" encoding="utf-8"?>
<!-- Layout of a header item in PreferenceActivity. -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?android:attr/activatedBackgroundIndicator"
    android:gravity="center_vertical"
    android:minHeight="48dp"
    android:paddingEnd="?android:attr/scrollbarSize"
    android:paddingStart="@dimen/mypreference_margin_start" >

    <RelativeLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="6dip"
        android:layout_marginEnd="6dip"
        android:layout_marginStart="2dip"
        android:layout_marginTop="6dip"
        android:layout_weight="1"
        android:gravity="center_vertical" >

        <TextView
            android:id="@+android:id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ellipsize="marquee"
            android:fadingEdge="horizontal"
            android:singleLine="true"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <TextView
            android:id="@+android:id/summary"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignStart="@android:id/title"
            android:layout_below="@android:id/title"
            android:ellipsize="end"
            android:maxLines="2"
            android:textAppearance="?android:attr/textAppearanceSmall" />
    </RelativeLayout>

    <!-- Preference should place its actual preference widget here. -->

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:padding="8dip" />

</LinearLayout>

三：引用一个layout文件为其指定UI，可以通过实现如下两个回调函数：

  @Override
    protected View onCreateView(ViewGroup parent) {
        // TODO Auto-generated method stub
        return super.onCreateView(parent);
    }



    @Override
    protected void onBindView(View view) {
        super.onBindView(view);

        mSpinner = (Spinner) view.findViewById(R.id.spinner1);

        String[] arraystr = view.getResources().getStringArray(R.array.itemspinner_values);
        mAdapter = new ArrayAdapter<String>(view.getContext(), android.R.layout.simple_spinner_dropdown_item, arraystr);
        //  也可一自己定义适配器的样式
        // mAdapter = new ArrayAdapter<String>(view.getContext(), R.layout.preference_categoary, mMeausStr);
        mSpinner.setAdapter(mAdapter);
        mSpinner.setOnItemSelectedListener(this);
    }

四：为组建添加需要的事件这里implementsOnItemSelectedListener

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        if (callChangeListener(position)) {
            setValue(position);
        }
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }

五：保存或持久化我们的改动

設置我們的改動

public void setValue(int value) {
        // Always persist/notify the first time.
        final boolean changed = !TextUtils.equals(Integer.toString(mValue), Integer.toString(value));
        if (changed || !mValueSet) {
            mValue = value;
            mValueSet = true;

            persistInt(value);
            if (changed) {
                notifyChanged();
            }
        }
    }


   @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        mPos = position;
        if (callChangeListener(position)) {
            setValue(position);
        }
    }

可以持久化多种基本数据类型

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        setValue(restoreValue ? getPersistedInt(mValue) : (Integer) defaultValue);
    }

六效果圖

自定义 Android Preference——SpinnerPreference的私人定制,布布扣,bubuko.com

自定义 Android Preference——SpinnerPreference的私人定制

标签：android   preference   spinner   widget   布局   

原文地址：http://blog.csdn.net/wang9258/article/details/38144813