The pictures set in the andorid layout file cannot be displayed

The pictures set in the andorid layout file cannot be displayed

As a little white, I also want to start blogging, it is regarded as the wrong set of questions ~

First of all, if your Activity is an inherited AppcompatActivity, your code uses normal ImageView and app: srcCompat attributes. If your Activity is not an inherited AppcompatActivity, use android.support.v7.widget.AppCompatImageView instead of ImageView

` <android.support.v7.widget.AppCompatImageView
            android:id="@+id/imageView7"
            android:layout_width="25dp"
            android:layout_height="29dp"
            app:srcCompat="@drawable/wechat"
            android:layout_marginTop="0dp"
            app:layout_constraintTop_toBottomOf="@+id/tv_zhanghaodenglu"
            app:layout_constraintLeft_toRightOf="@+id/tv_qitadenglu"
            android:layout_marginLeft="3dp"
            app:layout_constraintRight_toLeftOf="@+id/tv_zhuce"
            android:layout_marginRight="8dp"
            app:layout_constraintHorizontal_bias="0.0" />`