我正在做一个包含自定义列表视图适配器的项目。在此列表视图中，我使用YouTube API从JSON Feed添加了数据。现在我想在列表视图的顶部添加一个搜索按钮。这将在List-view中搜索内容。我怎么能这样做？
这是我的代码..
@Override
public void onTabSelected(TabLayout.Tab tab) {
pager.setCurrentItem(tab.getPosition());
}
我的listView适配器就在这里....
public class MainActivity extends ActionBarActivity {
// Declare Variables
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
ListViewAdapter adapter;
ProgressDialog mProgressDialog;
ArrayList<HashMap<String, String>> arraylist;
private AdView mAdView;
private InterstitialAd interstitial;
private long lastPressedTime;
static String imgURL = "url";
static String VIDEO_ID = "videoId";
static String TITLE = "title";
static String THUMBNAILS = "img";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the view from listview_main.xml
setContentView(R.layout.listview_main);
// Execute DownloadJSON AsyncTask
new DownloadJSON().execute();
AdView mAdView = new AdView(this);
mAdView.setAdSize(AdSize.SMART_BANNER);
// Gets the ad view defined in layout/ad_fragment.xml with ad unit ID set in
// values/strings.xml.
mAdView = (AdView) findViewById(R.id.ad_view);
// Create an ad request. Check logcat output for the hashed device ID to
// get test ads on a physical device. e.g.
// "Use AdRequest.Builder.addTestDevice("ABCDEF012345") to get test ads on this device."
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice("CF2B5D5C45BA785670BBCAEA9269EA35")
.build();
// Start loading the ad in the background.
mAdView.loadAd(adRequest);
}
// DownloadJSON AsyncTask
private class DownloadJSON extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(MainActivity.this);
// Set progressdialog title
mProgressDialog.setTitle("বাংলা নাটক ২০১৫");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// Create an array
arraylist = new ArrayList<HashMap<String, String>>();
// Retrieve JSON Objects from the given URL address
String query = "bangla natok 2015";
query = query.replace(" ", "+");
try {
query = URLEncoder.encode(query, "utf-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
}
jsonobject = JSONfunctions.getJSONfromURL("https://www.googleapis.com/youtube/v3/search?part=id%2Csnippet&order=viewCount&q=bangla+natok+2015+full&maxResults=50&key=AIzaSyCojCp66RLS9OY8hOwnW0UWLNdC56z24Os");
try {
// Locate the array name in JSON
JSONArray jsonarray = jsonobject.getJSONArray("items");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
JSONObject jsonObjId = jsonobject.getJSONObject("id");
map.put("videoId", jsonObjId.getString("videoId"));
JSONObject jsonObjSnippet = jsonobject.getJSONObject("snippet");
map.put("title", jsonObjSnippet.getString("title"));
//map.put("description", jsonObjSnippet.getString("description"));
// map.put("flag", jsonobject.getString("flag"));
JSONObject jsonObjThumbnail = jsonObjSnippet.getJSONObject("thumbnails");
String imgURL = jsonObjThumbnail.getJSONObject("high").getString("url");
map.put("url",imgURL);
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void args) {
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listview);
// Pass the results into ListViewAdapter.java
adapter = new ListViewAdapter(MainActivity.this, arraylist);
// Set the adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
}
}
public boolean onKeyDown(int paramInt, KeyEvent paramKeyEvent)
{
int i = 0;
boolean bool = true;
if (paramKeyEvent.getKeyCode() == 4) {
switch (paramKeyEvent.getAction())
{
case 0:
if (paramKeyEvent.getDownTime() - this.lastPressedTime >= 3000L)
{
Toast.makeText(getApplicationContext(), "Press Back To Exit", 0).show();
this.interstitial = new InterstitialAd(this);
this.interstitial.setAdUnitId("ca-app-pub-4265785833148880/6768099054");
AdRequest localAdRequest = new AdRequest.Builder().addTestDevice(AdRequest.DEVICE_ID_EMULATOR).addTestDevice("CF2B5D5C45BA785670BBCAEA9269EA35").build();
this.interstitial.loadAd(localAdRequest);
this.interstitial.setAdListener(new AdListener()
{
private void displayInterstitial()
{
if (MainActivity.this.interstitial.isLoaded()) {
MainActivity.this.interstitial.show();
}
}
public void onAdLoaded()
{
displayInterstitial();
}
});
this.lastPressedTime = paramKeyEvent.getEventTime();
}
else
{
finish();
}
bool = true;
}
}
return bool;
}
@Override
public boolean onCreateOptionsMenu(Menu paramMenu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, paramMenu);
return true;
}
public boolean onOptionsItemSelected(MenuItem paramMenuItem)
{
switch (paramMenuItem.getItemId())
{
default:
super.onOptionsItemSelected(paramMenuItem);
case R.id.rate_app:
Toast.makeText(getApplicationContext(), "Rate This App", Toast.LENGTH_SHORT).show();
super.onOptionsItemSelected(paramMenuItem);
startActivity(new Intent("android.intent.action.VIEW", Uri.parse("https://play.google.com/store/apps/details?id=com.nextappsbd.banglanatok2015")));
break;
case R.id.share_app:
Intent localIntent = new Intent("android.intent.action.SEND");
localIntent.setType("text/plain");
localIntent.putExtra("android.intent.extra.TEXT", "Enjoy This Apps https://play.google.com/store/apps/details?id=com.nextappsbd.banglanatok2015");
startActivity(Intent.createChooser(localIntent, "Share This App Using"));
break;
case R.id.check_update:
Toast.makeText(getApplicationContext(), "Update This App", Toast.LENGTH_SHORT).show();
startActivity(new Intent("android.intent.action.VIEW", Uri.parse("https://play.google.com/store/apps/details?id=com.nextappsbd.banglanatok2015")));
break;
case R.id.exit:
finish();
System.exit(0);
}
return true;
}
答案 0 :(得分：0)
答案 1 :(得分：0)
由于您提到您使用的是ListView，我认为以下内容可能对您有用
in xml
只需在listView
<?xml version="1.0" encoding="utf-8"?>
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
android:label="@string/app_label"
android:hint="@string/search_hint" >
</searchable>
在适配器中执行以下更改，实现Filterable接口以及getFilter（）方法
编写一个扩展android.widget.Filter 的自定义类 并覆盖这两种方法并在其中执行您的业务逻辑。
FilterResults performFiltering(CharSequence constraint) and
void publishResults(CharSequence constraint,FilterResults results)
作为如何使用它的示例，请参阅this