Passing id of adjacent view in xml to the custom view and retrieving it in constructor of custom view

android, android-custom-view, android-layout, android-widget

Solution

Now My question is I want to obtain the resource identifier of Progressbar in constructor of AsyncImageView which is as follows.

If I'm not mistaken you can use the `getResourceId()` method in your constructor:

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AsyncImageView, defStyle, 0);
int progressId = a.getResourceId(R.styleable.AsyncImageView_progressId, 0);

Also, if you declare the id of the `ProgressBar` in the `AsyncImageView` attribute then I think you need set the id like this for the `ProgressBar`:

android:id="@id/asyncLoadingProgress"

Problem

Below is my xml ``` <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="5dp" xmlns:app="http://schemas.android.com/apk/res/com.infibeam.allthingsd.apps.spinr"> <com.asyncimagewidget.AsyncImageView android:id="@+id/discover_list_icon" android:layout_width="130dp" android:layout_height="130dp" android:layout_alignParentLeft="true" android:layout_centerHorizontal="true" app:progressId="@+id/asyncLoadingProgress" /> <ProgressBar android:id="@+id/asyncLoadingProgress" android:layout_width="130dp" android:layout_height="130dp" android:layout_alignParentLeft="true" android:layout_centerHorizontal="true" /> </RelativeLayout> ``` You can see app:progressId="@+id/asyncLoadingProgress" Which is a custom attribute I had defined in the attrs.xml which is as follows. ``` <resources> <declare-styleable name="AsyncImageView"> <attr name="defaultSrc" format="reference" /> <attr name="parentId" format="reference" /> <attr name="progressId" format="reference" /> <attr name="url" format="string" /> <attr name="inDensity"> <enum name="ldpi" value="120" /> <enum name="mdpi" value="160" /> <enum name="hdpi" value="240" /> <enum name="xhdpi" value="320" /> </attr> </declare-styleable> </resources> ``` Now My question is I want to obtain the resource identifier of Progressbar in constructor of AsyncImageView which is as follows. ``` public AsyncImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initializeDefaultValues(); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AsyncImageView, defStyle, 0); Drawable d = a.getDrawable(R.styleable.AsyncImageView_defaultSrc); if (d != null) { setDefaultImageDrawable(d); } final int inDensity = a .getInt(R.styleable.AsyncImageView_inDensity, -1); if (inDensity != -1) { setInDensity(inDensity); } setUrl(a.getString(R.styleable.AsyncImageView_url)); a.recycle(); } ```

Original source