如何使用CursorAdapter将Filter设置为ListView? [英] How to set Filter to ListView with CursorAdapter?
问题描述
我有一个ListView
.其中的哪些项来自自定义CursorAdapter
.我为CardView
的ListView项目创建了单独的布局.我在每个卡上都有六个TextViews
,它们是Database
值.现在,我必须放入EditText
来根据在EditText中输入的文本来过滤ListView项.
我的密码是
ListView的布局是
I have a ListView
. which of it's items are from custom CursorAdapter
. I have created separate layout for ListView items which is a CardView
. I have six TextViews
on each card they are Database
values. Now i have to put a EditText
to filter the ListView items according to the text entered in EditText.
My Code is
layout with ListView is
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#1d4563">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/listView2"
android:layout_marginTop="40dp"
android:layout_centerHorizontal="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="@+id/editText5"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:background="@drawable/bg_edit"
android:textColorHint="#d3d3d3"
android:hint="enter Serial Number to search" />
ListView项的布局是
ListView items layout is
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android.support.v7.cardview="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android.support.v7.cardview:cardBackgroundColor="@color/primary_dark"
android:id="@+id/cardItems">
<android.support.v7.widget.CardView
android:id="@+id/card_view"
android:layout_gravity="center"
android:layout_width="fill_parent"
android:layout_height="150dp"
android:layout_margin="1dp"
card_view:cardCornerRadius="0dp"
card_view:contentPadding="2dp">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/card_style">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Username"
android:id="@+id/textView24"
android:textColor="#FFFFFF"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="25dp"
android:layout_marginStart="25dp"
android:layout_marginTop="8dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Mobile No."
android:id="@+id/textView25"
android:textColor="#FFFFFF"
android:layout_centerVertical="true"
android:layout_marginLeft="25dp"
android:layout_marginStart="25dp"
android:layout_alignRight="@+id/textView24"
android:layout_alignEnd="@+id/textView24" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Serial No."
android:id="@+id/textView26"
android:textColor="#FFFFFF"
android:layout_marginLeft="25dp"
android:layout_marginStart="25dp"
android:layout_alignParentBottom="true"
android:layout_marginBottom="8dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/textView27"
android:textColor="#FFFFFF"
android:layout_marginTop="8dp"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/textView28"
android:textColor="#FFFFFF"
android:layout_centerVertical="true"
android:layout_alignLeft="@+id/textView27"
android:layout_alignStart="@+id/textView27" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/textView29"
android:layout_alignTop="@+id/textView26"
android:layout_alignLeft="@+id/textView28"
android:layout_alignStart="@+id/textView28"
android:layout_marginBottom="8dp"
android:textColor="#FFFFFF"/>
</RelativeLayout>
</android.support.v7.widget.CardView>
我的DisplayAdapter
是
public class DisplayAdapter extends CursorAdapter{
@SuppressWarnings("deprecation")
public DisplayAdapter(Context context,Cursor c){
super(context,c);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View retView = inflater.inflate(R.layout.card_items, parent, false);
return retView;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
TextView tvUserName=(TextView)view.findViewById(R.id.textView27);
tvUserName.setText(cursor.getString(2));
TextView tvMobile=(TextView)view.findViewById(R.id.textView28);
tvMobile.setText(cursor.getString(3));
TextView tvSerail=(TextView)view.findViewById(R.id.textView29);
tvSerail.setText(cursor.getString(5));
}
}
我的活动是
public class TableBikeActivity extends ActionBarActivity {
private DisplayAdapter adapter;
ListView bikeList;
DatabaseHelper databaseHelper;
EditText filterText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_table_bike);
databaseHelper=new DatabaseHelper(this);
bikeList=(ListView)findViewById(R.id.listView2);
filterText=(EditText)findViewById(R.id.editText5);
filterText.addTextChangedListener(filterTextWatcher);
new Handler().post(new Runnable() {
@Override
public void run() {
adapter = new DisplayAdapter(TableBikeActivity.this, databaseHelper.getAllDataBike());
bikeList.setAdapter(adapter);
}
});
}
private TextWatcher filterTextWatcher=new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
adapter.getFilter().filter(s);
}
@Override
public void afterTextChanged(Editable s) {
}
};
@Override
protected void onDestroy(){
super.onDestroy();
filterText.removeTextChangedListener(filterTextWatcher);
}
}
我尝试了TextChangedListener,但是它不起作用.救救我.
I have tried TextChangedListener but it's not working. Help me.
推荐答案
setTextFilterEnabled()
方法不会自动实现过滤,因为它不知道游标中的文本应该被过滤掉.
The setTextFilterEnabled()
method doesn't automatically implement filtering, as it doesn't know what in your Cursor the text should be filtered against.
对于CursorAdapter
游标,您只需要使用setFilterQueryProvider
即可根据约束条件对游标运行另一个查询:
For a CursorAdapter
cursor, you only need to use the setFilterQueryProvider
, to run another query for your cursor, based on the constraint:
m_Adapter.setFilterQueryProvider(new FilterQueryProvider() {
public Cursor runQuery(CharSequence constraint) {
Log.d(LOG_TAG, "runQuery constraint:"+constraint);
//uri, projection, and sortOrder might be the same as previous
//but you might want a new selection, based on your filter content (constraint)
Cursor cur = managedQuery(uri, projection, selection, selectionArgs, sortOrder);
return cur; //now your adapter will have the new filtered content
}
});
添加约束(例如使用TextView)时,必须过滤适配器:
When a constraint is added (eg. by using a TextView) the adapter must be filtered:
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.d(LOG_TAG, "Filter:"+s);
if (m_slvAdapter!=null) {
m_Adapter.getFilter().filter(s);
}
}
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