need:
1. ListView can slide the item sideways, display the delete button, click the delete button, and delete the current item
2. When the delete button is displayed, click the hidden delete button and does not respond to the item click event.
3. When the delete button is hidden, click item to respond to the click event
According to the above requirements, there are also imitation QQ side-sliding codes, but they cannot meet the requirements of 2 and 3. Therefore, I modified it and the code is as follows. Let's take a look at it.
Step 1: Rewrite ListView
public class SwipeListView extends ListView {
private final static String TAG = "SwipeListView";
private int mScreenWidth; // Screen width private int mDownX; // Press the x value of the point private int mDownY; // Press the y value of the point private int mDeleteBtnWidth;// Delete the width of the button private boolean isDeleteShown = false; // Is the delete button displayed? private boolean isOnClick = false;
private ViewGroup mPointChild; // The item currently processed private mLayoutParams; // LayoutParams of the currently processed item public SwipeListView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SwipeListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// Get screen width WindowManager wm = (WindowManager) (Context.WINDOW_SERVICE);
DisplayMetrics dm = new DisplayMetrics();
().getMetrics(dm);
mScreenWidth = ;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (()) {
case MotionEvent.ACTION_DOWN:
performActionDown(ev);
break;
case MotionEvent.ACTION_MOVE:
return performActionMove(ev);
case MotionEvent.ACTION_UP:
return performActionUp(ev);
// break;
}
return (ev);
}
// Handle action_down events private void performActionDown(MotionEvent ev) {
// (TAG,"performActionDown===="+isDeleteShown);
if (isDeleteShown) {
turnToNormal();
}
isOnClick = true;
mDownX = (int) ();
mDownY = (int) ();
// Get the item of the current point int downPosition = pointToPosition(mDownX, mDownY);
int firstPosition= getFirstVisiblePosition();
(TAG,"performActionDown====downPosition:"+downPosition+"==firstPosition"+firstPosition);
if(downPosition < 0) return;
mPointChild = (ViewGroup) getChildAt(downPosition-firstPosition);
// Get the width of the delete button mDeleteBtnWidth = (1).getLayoutParams().width;
mLayoutParams = () (0)
.getLayoutParams();
// Why do you need to reset layout_width equals screen width // Because when match_parent, no matter how you slide, the delete button will not be displayed. // why? Because when match_parent, ViewGroup does not layout the remaining view = mScreenWidth;
(0).setLayoutParams(mLayoutParams);
}
// Handle action_move event private boolean performActionMove(MotionEvent ev) {
// (TAG, "performActionMove====" + isDeleteShown);
int nowX = (int) ();
int nowY = (int) ();
isOnClick = false;
if ((nowX - mDownX) > (nowY - mDownY)) {
// If swipe to the left if (nowX < mDownX) {
// Calculate the distance to be offset int scroll = (nowX - mDownX) / 2;
// If the width of the delete button is greater than the width of the delete button, the maximum width of the delete button is if (-scroll >= mDeleteBtnWidth) {
scroll = -mDeleteBtnWidth;
}
// Reset leftMargin = scroll;
(0).setLayoutParams(mLayoutParams);
}
return true;
}
return (ev);
}
// Handle action_up event private boolean performActionUp(MotionEvent ev) {
boolean falg = false;
if(isOnClick && !isDeleteShown)
{
falg = true;
}
// If the offset is greater than half of the button, the button will be displayed // Otherwise, restore the default if (- >= mDeleteBtnWidth / 2) {
= -mDeleteBtnWidth;
isDeleteShown = true;
} else {
turnToNormal();
isDeleteShown = false;
}
(0).setLayoutParams(mLayoutParams);
// (TAG, "performActionUp====" + isDeleteShown);
if(falg)
{
return (ev);
}
return true;
}
/**
* Change to normal state
*/
public void turnToNormal() {
= 0;
(0).setLayoutParams(mLayoutParams);
}
/**
* Is it currently available to click
*
* @return Is it clickable
*/
public boolean canClick() {
return !isDeleteShown;
}
}
Step 2: Adapter
class SwipeListAdapter extends BaseAdapter {
@Override
public int getCount() {
return ();
}
@Override
public Object getItem(int position) {
return (position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (null == convertView) {
holder = new ViewHolder();
convertView = (, .item_swipe_list, null);
= (LinearLayout) ();
= (TextView) (.tv_name);
= (TextView) ();
(holder);
}
else {
holder = (ViewHolder) ();
}
((position));
final int pos = position;
(new () {
@Override
public void onClick(View v) {
(pos);
notifyDataSetChanged();
();
}
});
return convertView;
}
}
static class ViewHolder {
LinearLayout tv;
TextView tvName;
TextView delete;
}
Step 3: Write a TestListViewActivity
private SwipeListView mListView;
private ArrayList<String> mData = new ArrayList<String>() {
{
for (int i = 0; i < 20; i++) {
add("hello world, hello android " + i);
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
(savedInstanceState);
setContentView(.activity_test_list_view);
Toolbar toolbar = (Toolbar) findViewById();
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById();
(new () {
@Override
public void onClick(View view) {
(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
mListView = (SwipeListView) findViewById();
(new SwipeListAdapter());
// (new () {
// @Override
// public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
// (, (position) + "Clicked",// Toast.LENGTH_SHORT).show();
// return false;
// }
// });
(new () {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
("SwipeListView", "setOnItemClickListener====" + ());
// (, (position) + "Clicked",// Toast.LENGTH_SHORT).show();
}
});
}
Step 4: Layout the file
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:andro
xmlns:tools="/tools"
xmlns:app="/apk/res-auto" android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/activity_test_list_view"
tools:context=".">
<.
android:
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:cacheColorHint="@android:color/transparent"
android:listSelector="@android:color/transparent"
android:divider="@android:color/darker_gray"
android:dividerHeight="2dp">
</.>
</RelativeLayout>
Step 5: The layout file of the item
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:andro
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/white"
android:paddingBottom="20dp"
android:paddingLeft="10dp"
android:paddingTop="20dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/group_name_rgb"
android: />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:layout_gravity="center_vertical"
android: />
</LinearLayout>
<TextView
android:
android:layout_width="80dp"
android:layout_height="match_parent"
android:background="#FFFF0000"
android:gravity="center"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:text="delete"
android:textColor="@android:color/white" />
</LinearLayout>
Key points:
int downPosition = pointToPosition(mDownX, mDownY);
The downPosition gets -1 during use, resulting in an exception in the subsequent method call!
The above is an example of the Android imitation QQ side-sliding delete ListView function introduced by the editor. I hope it will be helpful to everyone. If you have any questions, please leave me a message and the editor will reply to everyone in time. Thank you very much for your support for my website!