解析XML时出错：未绑定前缀

Question

so i am trying to do this tutorial http://code.tutsplus.com/tutorials/android-sdk-creating-custom-views--mobile-14548 to create a custom view button so that i can make the pink circle thats drawn on the screen i am getting an error when i try to do the tutorial here is the main file.

public class Main extends ActionBarActivity {
    Draw v;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        LinearLayout layout1 = new LinearLayout (this);
        FrameLayout game = new FrameLayout(this);
        Draw v = new Draw (this, null);

        game.addView(v);
        game.addView(layout1);
        setContentView(game);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

here is the XML file for that this is where im getting the error

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:custom="http://schemas.android.com/apk/res/com.Tripps.test.Draw"
    xmlns:Tripps="http://schemas.android.com/apk/res/com.Tripps.test"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.Tripps.test.Main" >

   <com.Tripps.test.Draw
    android:id="@+id/custView"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_margin="5dp"
    custom:circleColor="#ff0099"
    custom:circleLabel="Hello"
    custom:labelColor="#ffff66" 
    </com.Tripps.test.Draw>

</RelativeLayout>

here is the Draw class that extends viewc this is what i am trying to reference

public class Draw extends View {


    //circle and text colors
    private int circleCol, labelCol;
    //label text
    private String circleText;
    //paint for drawing custom view
    private Paint circlePaint;


    public Draw(Context context, AttributeSet attrs){
        super(context, attrs);
      //paint object for drawing in onDraw
        circlePaint = new Paint();
      //get the attributes specified in attrs.xml using the name we included
        TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
            R.styleable.DrawV, 0, 0);
    }
       @Override
       protected void onDraw(Canvas canvas) {;

       }
}

and here is what the tutorial told me to do its a file called attr in the values folder. in the i dont know why but i put it there

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="Draw">
    <attr name="circleColor" format="color" ></attr>
    <attr name="circleLabel" format="string"></attr>
    <attr name="labelColor" format="color"></attr>
</declare-styleable>
</resources>

Answer 1

tutorial told me to do its a file called attr in the values folder. in the i dont know why but i put it there

To use custom attributes for custom view, add all attributes in attrs.xml file.

Create attrs.xml file inside res/values folder.