Layout not showing up when using intent to start new activity
Question
I have a fragment class with 6 hard-coded cardviews. I want the user to be able to click on them and it open up another activity. Each opens to different activity. Currently, when the user clicks on the cardview it opens the new activity, but doesn't show the layout. For example, when the user clicks on the science cardview it just shows a blank page, but doesn't show the layout with the button.
Here is my fragment page code:
public class show_class extends Fragment implements
View.OnClickListener {
private CardView science_cv, math_cv, social_studies_cv, english_cv,
tech_cv, other_cv;
private DatabaseReference myRef ;
//List<show_class> list;
// private RecyclerView recycle;
// Button view;
public show_class() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_show_class, container, false);
//find cardview's by ids
science_cv = (CardView) view.findViewById(R.id.science);
math_cv = (CardView) view.findViewById(R.id.math);
social_studies_cv = (CardView) view.findViewById(R.id.social_studies);
english_cv = (CardView) view.findViewById(R.id.English);
tech_cv = (CardView) view.findViewById(R.id.tech);
other_cv= (CardView) view.findViewById(R.id.other);
//set onclicklistener to cardviews
science_cv.setOnClickListener(this);
social_studies_cv.setOnClickListener(this);
math_cv.setOnClickListener(this);
english_cv.setOnClickListener(this);
tech_cv.setOnClickListener(this);
other_cv.setOnClickListener(this);
return view;
}
public void onClick (View v){
Intent i;
switch (v.getId()) {
case R.id.science:
i = new Intent(getContext(), Science_classes.class);
case R.id.math: i = new Intent(getContext(), Math_classes.class);startActivity(i);break;
case R.id.social_studies: i = new Intent(getContext(), Social_studies_classes.class);startActivity(i);break;
case R.id.English: i = new Intent(getContext(), English_classes.class);startActivity(i);break;
case R.id.tech: i = new Intent(getContext(), Technology_classes.class);startActivity(i);break;
case R.id.other: i = new Intent(getContext(), Other_classes.class);startActivity(i);break;
default:break;
}
}
}
Here is my xml for the fragment page:
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent" android:layout_height="match_parent">
<ScrollView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#a4a4a4">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:clipToPadding="false"
android:gravity="center"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
android:clickable="true"
android:focusable="true"
android:foreground="?android:selectableItemBackground"
android:id="@+id/science"
android:layout_width="160dp"
android:layout_height="190dp"
android:layout_margin="10dp"
android:padding="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="130dp"
android:gravity="center"
android:background="@color/colorSecondary">
<ImageView
android:layout_width="64dp"
android:layout_height="64dp"
android:src="@drawable/ic_launcher_background"
android:padding="10dp"/>
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Science"
android:textColor="#000"
android:textSize="18dp" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/lightgray"
android:layout_margin="2dp"/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:onClick="show2"
android:foreground="?android:attr/selectableItemBackground"
android:clickable="true"
android:id="@+id/math"
android:layout_width="160dp"
android:layout_height="190dp"
android:layout_margin="10dp"
android:padding="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="130dp"
android:gravity="center"
android:background="@color/colorSecondary">
<ImageView
android:layout_width="64dp"
android:layout_height="64dp"
android:padding="10dp"
android:src="@drawable/ic_launcher_background" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Math"
android:textColor="#000"
android:textSize="18dp" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/lightgray"
android:layout_margin="2dp"/>
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
<LinearLayout
android:clipToPadding="false"
android:gravity="center"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
android:onClick="show3"
android:foreground="?android:attr/selectableItemBackground"
android:clickable="true"
android:id="@+id/English"
android:layout_width="160dp"
android:layout_height="190dp"
android:layout_margin="10dp"
android:padding="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="130dp"
android:gravity="center"
android:background="@color/colorSecondary">
<ImageView
android:layout_width="64dp"
android:layout_height="64dp"
android:padding="10dp"
android:src="@drawable/ic_launcher_background" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="English"
android:textColor="#000"
android:textSize="18dp" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/lightgray"
android:layout_margin="2dp"/>
/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:onClick="show4"
android:foreground="?android:attr/selectableItemBackground"
android:clickable="true"
android:id="@+id/social_studies"
android:layout_width="160dp"
android:layout_height="190dp"
android:layout_margin="10dp"
android:padding="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="130dp"
android:gravity="center"
android:background="@color/colorSecondary">
<ImageView
android:layout_width="64dp"
android:layout_height="64dp"
android:padding="10dp"
android:src="@drawable/ic_launcher_background" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Social Studies"
android:textColor="#000"
android:textSize="18dp" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/lightgray"
android:layout_margin="2dp"/>
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
<LinearLayout
android:clipToPadding="false"
android:gravity="center"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
android:onClick="show5"
android:foreground="?android:attr/selectableItemBackground"
android:clickable="true"
android:id="@+id/tech"
android:layout_width="160dp"
android:layout_height="190dp"
android:layout_margin="10dp"
android:padding="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<LinearLayout
android:background="@color/colorSecondary"
android:layout_width="match_parent"
android:layout_height="130dp"
android:gravity="center"
>
<ImageView
android:layout_width="64dp"
android:layout_height="64dp"
android:src="@drawable/ic_launcher_background"
android:padding="10dp"/>
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Technology"
android:textColor="#000"
android:textSize="18dp" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/lightgray"
android:layout_margin="2dp"/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:onClick="show6"
android:foreground="?android:attr/selectableItemBackground"
android:clickable="true"
android:id="@+id/other"
android:layout_width="160dp"
android:layout_height="190dp"
android:layout_margin="10dp"
android:padding="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="130dp"
android:gravity="center"
android:background="@color/colorSecondary">
<ImageView
android:layout_width="64dp"
android:layout_height="64dp"
android:padding="10dp"
android:src="@drawable/ic_launcher_background" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Other"
android:textColor="#000"
android:textSize="18dp" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/lightgray"
android:layout_margin="2dp"/>
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
</LinearLayout>
</ScrollView></FrameLayout>
Here is the code for the science class i am trying to go to(it is the same for all):
public class Science_classes extends AppCompatActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_science_classes);
}
}
Here is the xml, just a simple button:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Science_classes">
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button" />
2 answers
solution1
1 ACCPTED 2019-06-05 13:18:50
there is a missing startActivity(i); and break; statement in the first case case R.id.science: that is the reason that after clicking science you are ending up with maths case and starting a maths activity. Will have to check if that is the problem of the blank screen. Is you maths activity layout empty?
solution2
0 2019-06-05 13:17:20
'in your show_class fragment in onClick() you are not starting the Science_classes activity like.' 'in first case of R.id.science'
startActivity(i);
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