[英]Android - How to I implement a search functionality and return the results back in a ListView?
我有一个 EditText,用户可以在其中从字符串数组(arr [] = “A”、“B”、“C”)中键入他们想要的任何文本(例如“A”、“B”或“C”) . 我有一个 ListView,当用户单击键盘上的“完成”按钮时,我希望在其中显示结果? 我如何在我的代码中做到这一点?
这是一个屏幕截图:
这是我的代码?
package com.mobilecomp.add.ssproj1;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
package com.mobilecomp.add.ssproj1;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A placeholder fragment containing a simple view.
*/
public class MainActivityFragment extends Fragment {
public MainActivityFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_main, container, false);
}
}
活动_main.xml
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/fragment"
android:name="com.mobilecomp.add.ssproj1.MainActivityFragment"
tools:layout="@layout/fragment_main" android:layout_width="match_parent"
android:layout_height="match_parent" />
fragment_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivityFragment">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/inputText"
android:layout_centerHorizontal="true"
android:inputType="text" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/searchResult"
android:layout_below="@+id/inputText"
android:layout_centerHorizontal="true" />
</RelativeLayout>
我认为最好的选择是使用TextWatcher
editText.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
});
首先使用android:id=@+id/button
向您的fragment_main
添加一些Button
。 然后在你的片段中:
private ListView mListView;
private EditText mEditText;
private Button mButton;
private ArrayList<String> mData = new ArrayList<>();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_main, container, false);
mListView = (ListView) v.findViewById(R.id.searchResult);
mEditText = (EditText) v.findViewById(R.id.inputText);
mButton = (Button) v.findViewById(R.id.button);
final ArrayAdapter<String> mAdapter = new ArrayAdapter<String>(getActivity().getApplicationContext(),android.R.layout.simple_dropdown_item_1line);
mListView.setAdapter(mAdapter);
//Some random data...
mData.add("A");
mData.add("B");
mData.add("C");
//Trigger, set listener on sth... button example
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final String fromEditText = mEditText.getText().toString().trim();
for (String aaa : mData) {
if (aaa.contains(fromEditText)) {
mAdapter.add(aaa);
}
}
}
});
return v;
}
编辑:
您可以执行以下mButton
,而不是在mButton
上设置侦听器:
mEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_DONE
|| event.getAction() == KeyEvent.FLAG_EDITOR_ACTION) {
final String fromEditText = mEditText.getText().toString().trim();
for (String aaa : mData) {
if (aaa.contains(fromEditText)) {
mAdapter.add(aaa);
}
}
}
return true;
}
});
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