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Android widget SearchView in onCreateOptionsMenu is null


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If your class extends AppCompatActivity
public class SearchableActivity extends AppCompatActivity


Check if linked appropriate library for:
import android.support.v4.view.MenuItemCompat;

import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

Check if you have to properly sett SearchView in menu xml for onCreateOptionsMenu menu_main.xml

<menu xmlns:android="//schemas.android.com/apk/res/android" xmlns:app="//schemas.android.com/apk/res-auto"
xmlns:tools="//schemas.android.com/tools"
tools:context=".SearchableActivity">
<item

  android:id="@+id/menu_search_my"

android:title="@string/menu_search"
android:icon="@drawable/ic_menu_search"
app:showAsAction="collapseActionView|ifRoom"
app:actionViewClass="android.support.v7.widget.SearchView"

/></menu>

Check your SearchableActivity onCreateOptionsMenu
   @TargetApi(Build.VERSION_CODES.HONEYCOMB) @SuppressLint("NewApi") @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);
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {

android.support.v7.widget.SearchView searchView = (android.support.v7.widget.SearchView)
MenuItemCompat.getActionView(menu.findItem(R.id.menu_search_my));
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
if(null!=searchManager ) {
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
}
searchView.setIconifiedByDefault(false);
}
return true;
}

397LW NO topic_id




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385

EditText.setOnKeyListener not working on maxLines EditText | edittext-setonkeylistener-not-working-on-maxlines-edittext


Check this in XML file if use singleLine
singleLine change to maxLines (1 if singleLine)
declare inputType


        android:maxLines="1"
        android:inputType="text"

282

Open Save UTF-8 File To String Java Android Code | open-save-utf-8-file-to-string-java-android-code



String sFileContent = readFile("myfile.txt",StandardCharsets.UTF_8);

	static String readFile(String path, Charset encoding) 
		  throws IOException 
		{
		  byte[] encoded = Files.readAllBytes(Paths.get(path));
		  return encoding.decode(ByteBuffer.wrap(encoded)).toString();
		}

// write file
String sOut = "text blah hello world etc.";
		writeToFile(sOut"someName.txt");	
	static void writeToFile(String sB,String name) {
		String folder = ("c:\\folder\\");
		File f = new File(folder+ name);
		BufferedWriter writer = null;
			writer = new BufferedWriter( new OutputStreamWriter(
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			writer.write( sB);

				if ( writer != null)
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230

Eclipse Log.e println needs a message | eclipse-log-e-println-needs-a-message


Log.e println needs a message error.
E/AndroidRuntime(330): FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{b.paint/b.paint.MainActivity}: java.lang.NullPointerException: println needs a message

Try this code:

		// Error
                String s = null;
		Log.e("bla", s); // !!! error Log.e println needs a message error.
                // OK
		String s = null;
		Log.e("bla", s+""); // OK 


345

Pixel to density independent pixel to pixel conversion | pixel-to-density-independent-pixel-to-pixel-conversion


Physical pixel (px)
Density independent pixel (dp)
Dots per inch (dpi) .. physical pixels per inch
px = dp * (dpi / 160)

public static int dpToPx(int dp)
{
    return (int) (dp * Resources.getSystem().getDisplayMetrics().density);
}

public static int pxToDp(int px)
{
    return (int) (px / Resources.getSystem().getDisplayMetrics().density);
}
356

No USB devices or running detected | no-usb-devices-or-running-detected


Check

  • is sett debug mode on device?

  • enabled debugging over USB?

  • is device right connected?

  • have you downloaded and instaled drivers for your device on PC?

  • For Windows //developer.android.com/sdk/win-usb.html

  • try disconnect and connect USB cable

  • try do restart Android Studio



Editace: 2015-11-25 09:49:36
Počet článků v kategorii: 397
Url:android-widget-searchview-in-oncreateoptionsmenu-is-null

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