从按钮单击访问LinearLayout子类参数

Question

I have a subclass called AuditQuestionEntry that extends LinearLayout. In addition to other fields, this layout contains a button. On my main activity ("AuditActivity") I have multiple instances of AuditQuestionEntry. From AuditActivity, I am setting an OnClickListener for the button in each of the AuditQuestionEntry layouts. In the OnClick method I need to access a parameter that's in the AuditQuestionEntry associated with the button that was clicked.

In the OnClickListener I call getParent() and I can cast that to AuditQuestionEntry. However, when I try to access a parameter from there it returns null (or 0 in my case because it's an int). Basically, it appears that getParent() is returning a new instance of the class and not the actual instance that contains the button.

Layout - audit_question_entry.xml:

<TextView
    android:id="@+id/auditQuestion"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Audit Question..."
    android:textSize="20dp" />

<Button
    android:id="@+id/btnTakeAuditPhoto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Add Photo" >
</Button>

Here's the AuditQuestionEntry.java:

public class AuditQuestionEntry extends LinearLayout {

// Define controls
private TextView auditQuestion;
private RatingBar auditRating;
private EditText auditComment;
private ImageView imageView;
private Button photoButton;

private static final int CAMERA_REQUEST = 1888;
private static final int REQUEST_IMAGE_CAPTURE = 1;

public int AuditQuestionNumber; // NEED TO GET THIS!
private Context _ctx;

public ClosetAuditQuestionObj AuditQuestion;

private String PhotoFolder;
private String FullPhotoPathAndName;

public AuditQuestionEntry(Context context) {
    super(context);
    // InflateView();

    throw new RuntimeException("Valid AuditQuestionNumber must be passed to this class via the XML parameters: workbench:AuditQuestionNumber.");
}

public AuditQuestionEntry(Context context, AttributeSet attrs) {
    super(context, attrs);

    this._ctx = context;

    initAttributes(attrs);
}

// Used to grab the AuditQuestionNumber attribute from the XML declaration
// for this layout
private void initAttributes(AttributeSet attrs) {
    TypedArray a = _ctx.obtainStyledAttributes(attrs, R.styleable.AuditQuestionEntry);

    AuditQuestionNumber = attrs.getAttributeIntValue("http://schemas.android.com/apk/com.bc.workbench", "AuditQuestionNumber", 0);

    a.recycle();
}

Inside AuditActivity onCreate() I have the following:

         OnClickListener btnPhotoListener = new OnClickListener() {

        @Override
        public void onClick(final View v) {

            View viewParent = (View) v.getParent();

            AuditQuestionEntry clickedAudit = (AuditQuestionEntry) viewParent;

            // On the following line, clickedAudit.AuditQuestionNumber is always 0 even though it was initialized and
            // displays properly on screen.
            Toast.makeText(CurrentContext, "Audit Question #" + clickedAudit.AuditQuestionNumber, Toast.LENGTH_SHORT).show();
        }

     };


        // Set event listener for photo buttons
        // =============================================
     ((Button) AuditQuestion1.findViewById(R.id.btnTakeAuditPhoto)).setOnClickListener(btnPhotoListener);
     ((Button) AuditQuestion2.findViewById(R.id.btnTakeAuditPhoto)).setOnClickListener(btnPhotoListener);

Answer 1

Where in the XML are you setting the attribute for the AuditQuestionNumber? The constructor is defaulting the value of the class attribute to 0 if the XML being used to inflate the class doesn't include the attribute:

AuditQuestionNumber = attrs.getAttributeIntValue("http://schemas.android.com/apk/com.bc.workbench", "AuditQuestionNumber", 0);