Android card view error on touching Card view -
i want toast message on touching each card card name:
xml code on android
<relativelayout android:layout_width="match_parent" android:layout_height="match_parent"> <imageview android:id="@+id/thumbnail" android:layout_width="match_parent" android:layout_height="@dimen/album_cover_height" android:background="?attr/selectableitembackgroundborderless" android:clickable="true" android:onclick="clikimage" android:scaletype="fitxy" /> java code
public void clikimage(view view){ toast.maketext(mainactivity.this, "cliked", toast.length_short).show(); } in code same toast coming each card..
the texts came code .
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/** * adding few albums testing */ private void preparealbums() { int[] covers = new int[]{ r.drawable.album1, r.drawable.album2, r.drawable.album3, r.drawable.album4, r.drawable.album5, r.drawable.album6, r.drawable.album7, r.drawable.album8, r.drawable.album9, r.drawable.album10, r.drawable.album11}; album = new album("true romance", 13, covers[0]); albumlist.add(a); = new album("xscpae", 8, covers[1]); albumlist.add(a); = new album("maroon 5", 11, covers[2]); albumlist.add(a); = new album("born die", 12, covers[3]); albumlist.add(a); = new album("honeymoon", 14, covers[4]); albumlist.add(a); = new album("i need doctor", 1, covers[5]); albumlist.add(a); = new album("loud", 11, covers[6]); albumlist.add(a); = new album("legend", 14, covers[7]); albumlist.add(a); = new album("hello", 11, covers[8]); albumlist.add(a); = new album("greatest hits", 17, covers[9]); albumlist.add(a); adapter.notifydatasetchanged(); } all cards entered manually. want set more cards , put in loop. please .
xml title code.
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:card_view="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="wrap_content"> <android.support.v7.widget.cardview android:id="@+id/card_view" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="center" android:layout_margin="@dimen/card_margin" android:elevation="3dp" card_view:cardcornerradius="@dimen/card_album_radius"> <relativelayout android:layout_width="match_parent" android:layout_height="match_parent"> <imageview android:id="@+id/thumbnail" android:layout_width="match_parent" android:layout_height="@dimen/album_cover_height" android:background="?attr/selectableitembackgroundborderless" android:clickable="true" android:onclick="clikimage" android:scaletype="fitxy" /> <textview android:id="@+id/title" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/thumbnail" android:paddingleft="@dimen/album_title_padding" android:paddingright="@dimen/album_title_padding" android:paddingtop="@dimen/album_title_padding" android:textcolor="@color/album_title" android:textsize="@dimen/album_title" /> <textview android:id="@+id/count" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/title" android:paddingbottom="@dimen/songs_count_padding_bottom" android:paddingleft="@dimen/album_title_padding" android:paddingright="@dimen/album_title_padding" android:textsize="@dimen/songs_count" /> <imageview android:id="@+id/overflow" android:layout_width="@dimen/ic_album_overflow_width" android:layout_height="@dimen/ic_album_overflow_height" android:layout_alignparentright="true" android:layout_below="@id/thumbnail" android:layout_margintop="@dimen/ic_album_overflow_margin_top" android:scaletype="centercrop" android:src="@drawable/ic_dots" /> </relativelayout> </android.support.v7.widget.cardview> </linearlayout> error when pasted imageview listner code..
08-09 11:35:07.453 3079-3079/com.example.jithin.myapplication e/androidruntime: fatal exception: main process: com.example.jithin.myapplication, pid: 3079 java.lang.runtimeexception: unable start activity componentinfo{com.example.jithin.myapplication/com.example.jithin.myapplication.mainactivity}: java.lang.nullpointerexception: attempt invoke virtual method 'void android.widget.imageview.setonclicklistener(android.view.view$onclicklistener)' on null object reference @ android.app.activitythread.performlaunchactivity(activitythread.java:2416) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2476) @ android.app.activitythread.-wrap11(activitythread.java) @ android.app.activitythread$h.handlemessage(activitythread.java:1344) @ android.os.handler.dispatchmessage(handler.java:102) @ android.os.looper.loop(looper.java:148) @ android.app.activitythread.main(activitythread.java:5417) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616) caused by: java.lang.nullpointerexception: attempt invoke virtual method 'void android.widget.imageview.setonclicklistener(android.view.view$onclicklistener)' on null object reference @ com.example.jithin.myapplication.mainactivity.oncreate(mainactivity.java:113) @ android.app.activity.performcreate(activity.java:6237) @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1107) @ android.app.activitythread.performlaunchactivity(activitythread.java:2369) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2476) @ android.app.activitythread.-wrap11(activitythread.java) @ android.app.activitythread$h.handlemessage(activitythread.java:1344) @ android.os.handler.dispatchmessage(handler.java:102) @ android.os.looper.loop(looper.java:148) @ android.app.activitythread.main(activitythread.java:5417) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616)
if want text toast view, need change "clicked" string inside toast text view. didn't show textview containing title if in same relativelayout imageview, like:
string textfromtextview = ((textview)((relativelayout)view.getparent()).findviewbyid(r.id.title).gettext(); toast.maketext(mainactivity.this, textfromtextview, toast.length_short).show();
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