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Eclipse “id cannot be resolved or is not a field” error Android


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"id cannot be resolved or is not a field” error
If you copy project to workspace or some code from other project you can get this error.

Try remove or add import your R file:

import com.example.app.R


Check xml files.
Clean project by menu Project-Clean

Maybe you have to create new project end copy old source files to new project folders.

397LW NO topic_id




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Další témata ....(Topics)


59

Relative layout RelativeLayout Android example | relative-layout-relativelayout-android-example


xml RelativeLayout Android example:

Eclipse graphical xml layout editor
[caption id="attachment_896" align="alignleft" width="261" caption="Relativelayout Eclipse graphical editor"]relativelayout-graphical-editor-eclipse[/caption]


res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="//schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView
        android:id="@+id/idLabel"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Enter word"/>
    <EditText
        android:id="@+id/idEntry"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@android:drawable/editbox_background"
        android:layout_below="@id/idLabel"/>
    <Button
        android:id="@+id/idOk"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/idEntry"
        android:layout_alignParentRight="true"
        android:layout_marginLeft="10dip"
        android:text="OK" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toLeftOf="@id/idOk"
        android:layout_alignTop="@id/idOk"
        android:text="Cancel" />
</RelativeLayout>
273

Android Widget OnClick Example | android-widget-onclick-example


Open link in browser after user do click on widget area:

private Context _context;
	@Override
		public void onStart(Intent intent, int startId) {
                        _context = this;
			String definePage ="//old.chmi.cz/meteo/rad/rad_data.php";
			 Intent defineIntent = new Intent(Intent.ACTION_VIEW,
			 Uri.parse(definePage));
			 PendingIntent pendingIntent = PendingIntent.getActivity(_context,
			 0 /* no requestCode */, defineIntent, 0 /* no flags */);
			 updateViews.setOnClickPendingIntent(R.id.widget, pendingIntent);

229

Which version of eclipse for android development | which-version-of-eclipse-for-android-development


I tried this Eclipse and work fine:
Eclipse Classic
//www.filehippo.com/download_eclipse_classic_32/

Eclipse Juno
Eclipse Helios

//developer.android.com/tools/sdk/eclipse-adt.html
56

Change background color dynamically View TableRow setBackgroundColor Android example | change-background-color-dynamically-view-tablerow-android-example


How change background color of View Android sample.

MainActivity.java

public class MainActivity extends Activity {
TextView hTextView;
TableRow hTableRow;
Button hButton, hButtonStop;
private Handler mHandler = new Handler();
private int nCounter = 0;
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        hTextView = (TextView)findViewById(R.id.idTextView);
        hButton = (Button)findViewById(R.id.idButton);
        hButton.setOnClickListener(mButtonStartListener);
        hTableRow = (TableRow)findViewById(R.id.idTableRow1);


        
        
    } // end onCreate

 View.OnClickListener mButtonStartListener = new OnClickListener() {
	public void onClick(View v) {
           hTableRow.setBackgroundColor(Color.YELLOW);
	}
 };
}





main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="//schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >


<TableLayout android:layout_height="wrap_content" android:layout_width="fill_parent" android:id="@+id/tableLayout1">
    <TableRow android:id="@+id/idTableRow1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" android:background="#5655AA">
<TextView  
	android:id="@+id/idTextView"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
    
    </TableRow>
</TableLayout>
</LinearLayout>
79

ArrayList Collections Add new Item Sort Find Item Java example | arraylist-collection-sort-add-java-example


How add item to ArrayList, sort ArrayList, search find index of item in ArrayList, min(), max() Java basic example.

import java.util.ArrayList;
import java.util.Collections;

public class MainClass {
	public static void main(String[] arg) {
		String[] arrayOfString = {"nothing", "Hello", "people"
				, "bye-bye", "hello", "world!", "End" };
		   ArrayList<String> arrayList = new ArrayList<String>();
            for(String s: arrayOfString)
		     arrayList.add(s);

		    Collections.sort(arrayList);
		    // foreach
		    for (String str: arrayList)
		      System.out.println(str);
		    
		    Object objMin = Collections.min(arrayList);
		    System.out.println("Min is: " + objMin);
		    
		    Object objMax = Collections.max(arrayList);
		    System.out.println("Max is: " + objMax);
		    
		    int index = Collections.binarySearch(arrayList, "people");
		    System.out.println("Index of people is: " + index);
		    
		  }

		
	
}
/*
End
Hello
bye-bye
hello
nothing
people
world!
Min is: End
Max is: world!
Index of people is: 5
*/


Editace: 2014-02-15 20:28:10
Počet článků v kategorii: 397
Url:eclipse-id-cannot-be-resolved-or-is-not-a-field-error-android

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