安卓getListView().setTextFilterEnabled(true)

本文介绍了一个简单的Android应用程序,该程序使用ListActivity展示了一个带有搜索功能的列表视图。通过调用setTextFilterEnabled(true)方法,使得用户可以在输入框中输入文字来筛选ListView中的项。

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getListView().setTextFilterEnabled(true),函数setTextFilterEnabled,属性为true表示listview获得当前焦点的时候,与相应用户输入的匹配符进行比对,筛选出匹配的ListView的列表中的项。

图(1)程序运行打开的首界面


图(2)从键盘输入数字1,从图(1)跳转到图(2)这个界面


图(3)从键盘输入“地图”两个字,从图(1)跳转到图(3)这个界面


图(4)从键盘输入“打”,从图(1)跳转到图(4)这个界面


package com.example.settextfilterenabled_test;



import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;

public class MainActivity extends ListActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//setContentView(R.layout.activity_main);
		// ListView的列表项的数组
				String[] menus = { "1", "a", "打电话","浏览器","地图"};
				//将数组内容设置为ListView的列表项展示
				setListAdapter(new ArrayAdapter<String>(this,
						android.R.layout.simple_list_item_1, menus));
				//还有个函数叫setFilterText,用来过滤列表中的数据。
				//这个属性为true表示listview获得当前焦点的时候,相应用户键盘输入的匹配符进行比对,筛选出匹配的
				getListView().setTextFilterEnabled(true);
				//这个属性为false表示listview不能获得当前焦点,与没有这项设置时的效果一样
				//getListView().setTextFilterEnabled(false);
		
	}
}

<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"

    tools:context=".MainActivity" >

 

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" 

        />

</RelativeLayout>

 

Ps

若继承ListActivity,用setContentView(R.layout.activity_main)加载布局文件,程序报错,即不能再以这种方式加载布局文件。



/* * Copyright (C) 2018 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.settings.localepicker; import static android.window.OnBackInvokedDispatcher.PRIORITY_DEFAULT; import android.app.FragmentTransaction; import android.content.Intent; import android.os.Bundle; import android.os.LocaleList; import android.provider.Settings; import android.util.Log; import android.view.MenuItem; import android.window.OnBackInvokedCallback; import androidx.core.view.ViewCompat; import com.android.internal.app.LocalePickerWithRegion; import com.android.internal.app.LocaleStore; import com.android.settings.R; import com.android.settings.core.SettingsBaseActivity; /** A activity to show the locale picker page. */ public class LocalePickerWithRegionActivity extends SettingsBaseActivity implements LocalePickerWithRegion.LocaleSelectedListener, MenuItem.OnActionExpandListener { private static final String TAG = LocalePickerWithRegionActivity.class.getSimpleName(); private static final String PARENT_FRAGMENT_NAME = "localeListEditor"; private LocalePickerWithRegion mSelector; private final OnBackInvokedCallback mOnBackInvokedCallback = () -> { handleBackPressed(); }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getActionBar().setDisplayHomeAsUpEnabled(true); setTitle(R.string.add_a_language); LocaleList explicitLocales = null; if (isDeviceDemoMode()) { Bundle bundle = getIntent().getExtras(); explicitLocales = bundle == null ? null : bundle.getParcelable(Settings.EXTRA_EXPLICIT_LOCALES, LocaleList.class); Log.i(TAG, "Has explicit locales : " + explicitLocales); } getOnBackInvokedDispatcher() .registerOnBackInvokedCallback(PRIORITY_DEFAULT, mOnBackInvokedCallback); mSelector = LocalePickerWithRegion.createLanguagePicker( this, LocalePickerWithRegionActivity.this, false /* translate only */, explicitLocales, null /* appPackageName */, this); getFragmentManager() .beginTransaction() .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN) .replace(R.id.content_frame, mSelector) .addToBackStack(PARENT_FRAGMENT_NAME) .commit(); } @Override public void onDestroy() { super.onDestroy(); getOnBackInvokedDispatcher().unregisterOnBackInvokedCallback(mOnBackInvokedCallback); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == android.R.id.home) { handleBackPressed(); return true; } return super.onOptionsItemSelected(item); } @Override public void onLocaleSelected(LocaleStore.LocaleInfo locale) { final Intent intent = new Intent(); intent.putExtra(LocaleListEditor.INTENT_LOCALE_KEY, locale); setResult(RESULT_OK, intent); finish(); } private void handleBackPressed() { if (getFragmentManager().getBackStackEntryCount() > 1) { super.onBackPressed(); } else { setResult(RESULT_CANCELED); finish(); } } private boolean isDeviceDemoMode() { return Settings.Global.getInt( getContentResolver(), Settings.Global.DEVICE_DEMO_MODE, 0) == 1; } @Override public boolean onMenuItemActionExpand(MenuItem item) { // To prevent a large space on tool bar. mAppBarLayout.setExpanded(false /*expanded*/, false /*animate*/); // To prevent user can expand the collpasing tool bar view. ViewCompat.setNestedScrollingEnabled(mSelector.getListView(), false); return true; } @Override public boolean onMenuItemActionCollapse(MenuItem item) { mAppBarLayout.setExpanded(false /*expanded*/, false /*animate*/); ViewCompat.setNestedScrollingEnabled(mSelector.getListView(), true); return true; } } 分析这个类
最新发布
06-07
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