Android带侧滑菜单的列表

实现了侧滑显示一个功能菜单的功能。自定义控件继承自HorizontalScrollView。放在一个自定义的列表适配器中。

public class MyHorizontalScrollView extends HorizontalScrollView implements
OnTouchListener {
private int screenWidth;
private int screenHeight;
private int changed;

public MyHorizontalScrollView(Context context) {

super(context);
// TODO Auto-generated constructor stu
getScreenParam(context);
setOnTouchListener(this);
}

public MyHorizontalScrollView(Context context, AttributeSet attrs,
int defStyleAttr) {
super(context, attrs, defStyleAttr);

// TODO Auto-generated constructor stub
getScreenParam(context);
setOnTouchListener(this);
}

public MyHorizontalScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
getScreenParam(context);
setOnTouchListener(this);
}

int left;
int oldleft;

@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
// TODO Auto-generated method stub
super.onScrollChanged(l, t, oldl, oldt);
left = l;
oldleft = oldl;

}

/**
* 获取屏幕宽高
*
* @param context
*/

protected void getScreenParam(Context context) {
MainActivity mContext = (MainActivity) context;
DisplayMetrics dm = new DisplayMetrics();
mContext.getWindowManager().getDefaultDisplay().getMetrics(dm);

screenWidth = dm.widthPixels;

screenHeight = dm.heightPixels;
Log.e("aaa", screenWidth + "," + screenHeight);
changed = dip2px(context, 100f);
}

/**
* dp转px方法
*
* @param context
* @param dpValue
* @return
*/
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}

private int touchEventId = -9983761;

Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
View scroller = (View) msg.obj;
if (msg.what == touchEventId) {
onStop();
}
}
};

@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_POINTER_UP
|| event.getAction() == MotionEvent.ACTION_UP) {
handler.sendMessageDelayed(handler.obtainMessage(touchEventId, v),
5);
}
return false;
}

private void onStop() {
if (oldleft < changed) {
smoothScrollTo(0, 0);
}
if (oldleft > changed) {
smoothScrollTo(changed * 2, 0);
}
}
}


列表的布局

<?xml version="1.0" encoding="utf-8"?>
<com.example.testscrolllist.MyHorizontalScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:scrollbars="@null" >

<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >

<TextView
android:id="@+id/test"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true" />

<Button
android:id="@+id/btn_delete"
android:layout_width="100dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/test"
android:background="#5fc1ce"
android:padding="10dp"
android:text="删除"
android:textColor="#fff"
android:textSize="18dp" />

<Button
android:id="@+id/btn_up"
android:layout_width="100dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/btn_delete"
android:background="#ffc64b"
android:padding="10dp"
android:text="置顶"
android:textColor="#fff"
android:textSize="18dp" />
</RelativeLayout>

</com.example.testscrolllist.MyHorizontalScrollView>适配器没有特殊的地方。只在testview中显示一行文字。
运行起来的效果。松手后如果菜单显示部分超过一半则显示菜单。如果显示部分不超过一半则隐藏菜单。