Adding a view dynamically not showing view

Question

I am using following code to inflate a view in my layout under its child LinearLayout:

LayoutInflater vi = (LayoutInflater)getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = vi.inflate(R.layout.your_layout, null);
// fill in any details dynamically here
TextView textView = (TextView) v.findViewById(R.id.a_text_view);
 textView.setText("your text");
// insert into main view
View insertPoint = findViewById(R.id.insert_point);
((ViewGroup) insertPoint).addView(v, 0, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));

But I can't see my view there. It shows up when I rotate my screen to landscape view. How to fix this?

EDIT:

Here is basically what I am doing. I have a TabActivity with two tabs. I use an application global which store a flag and TabHost of my TabActivity. I am also using a thread in the second tab activity which is monitoring the application global continuously to monitor flag. When I click a button in my first tab, I set the global to true. The thread in the second tab check its value. When it gets true, I run the async task and shift the current showing window to the second tab using my TabHost stired in ApplicationGlobal.

Code of second tab:

public class ShowDownloadsActivity extends Activity {
    private List<String> list;
    ApplicationGlobal ap;
    String tempUrl = "";
    LinearLayout lly;
    LayoutInflater inflater;
    Context con;
    static int k = 0;
    static int tmp = 0;
    static int size = 0;
    View insertPoint;
    View v;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.shwds);
        con = this;
        v = LayoutInflater.from(this).inflate(R.layout.downloadlistrow, null);
        insertPoint = (View) findViewById(R.id.layout_vids);
        inflater = (LayoutInflater) con.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        ap = (ApplicationGlobal) getApplication();
        lly = (LinearLayout) findViewById(R.id.layout_vids);

        Thread thread1 = new Thread() {
            public void run() {
                try {
                    boolean flg = ap.getFlag();
                    if (flg) {
                        tempUrl = ap.getUrl();
                        ap.setUrl("");
                        flg = false;
                        new downloadVideo().execute();
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        };
        thread1.run();
    }

    class downloadVideo extends AsyncTask<Hashtable<String, String>, String, String> {
        String resp = "";

        protected void onProgressUpdate(String... values) {

        }

        @Override
        protected void onPreExecute() {
            // fill in any details dynamically here 
            TextView textView = (TextView) v.findViewById(R.id.siz);
            textView.setText("your text");
            // insert into main view 
            addContentView(v, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
            super.onPreExecute();
        }

        @Override
        protected String doInBackground(Hashtable<String, String>... prmss) {
            try {
                final int return resp;
            }

            @Override
            protected void onPostExecute (String result){
                super.onPostExecute(result);
            }
        }
    }
}

Here your_layout is the layout which I need to inflate. a_text_view is a textview inside your_layout. insert_point is a LinearLayout inside my main layout where I am inflating the view. Please tell me if any more info is needed :) — Pradeep Mittal
– Pradeep Mittal, Commented Oct 26, 2013 at 5:27

Amit Gupta · Accepted Answer · 2013-10-26 05:37:06Z

3

First Initialize your Layout to which you want to add subview.

For example

LinearLayout layout=(LinearLayout)findViewById(R.id.your_root_layout);

Then inflate your layout like below

LayoutInflater mInflater = (LayoutInflater) getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
    View v= (View) mInflater.inflate(R.layout.your_layout, null);
TextView textView = (TextView) v.findViewById(R.id.a_text_view);
textView.setText("your text");
LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
layout.addView(textView, p);

Hope this will help you.

answered Oct 26, 2013 at 5:37

Amit Gupta

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3 Comments

Pradeep Mittal Over a year ago

Sir,the code is inflating the View. But this is not the issue. The View is not visible to me. It became visible when I rotate the screen to landscape view. Looks like it needs the screen to be refreshed maybe :) –

Amit Gupta Over a year ago

@PradeepMittal can you post your Layout?

Dastin Over a year ago

It could be because the layout, which contains child views you're gonna add, was drawn, so you need to force it to draw again by calling layout.invalidate() or layout.requestLaout() (if the preceding method doesn't work for you). IMHO, invalidate is enough if your layout didn't change size or position. And this is easy to understand that why you change the layout to landscape by rotating, it also forces the layout to re-draw.

jc12 · Accepted Answer · 2020-01-08 21:19:39Z

2

Sometimes the issue is that you were expecting the LinearLayout to be vertical orientation, but if you don't set it to vertical, then the LinearLayout defaults to horizontal orientation, which if there is already an item with match parent width, then you won't see your additional items.

answered Jan 8, 2020 at 21:19

jc12

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Comments

Vahe Gharibyan · Accepted Answer · 2020-01-08 22:27:24Z

0

That is because parent view already measured her children. If you add view after measuring you should call

View.invalidate()

Also make sure does the child view visibility is View.visible and the view bounds is not 0;

answered Jan 8, 2020 at 22:27

Vahe Gharibyan

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Comments

Janos Vinceller · Accepted Answer · 2020-04-09 21:55:23Z

Some years after you were asking this question :) I recognized the problem after reading your last comment: "For which view shall I call invalidate()? I need to run the addView function in an async task. Like View.invalidate(); Which view? – Pradeep Mittal Oct 26 '13 at 5:41"

Your issue is the following. You are trying to insert those views after running an asynchronous task. For that you have to be on the UI thread, you should never access the view from another thread, as the UI thread.

Try to wrap everything you do on your UI in a

runOnUiThread(new Runnable() {
    @Override
    public void run() { ... code changing the UI ... }
});

So try to change your onPreExecute like this:

@Override
protected void onPreExecute() {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            // fill in any details dynamically here 
            TextView textView = (TextView) v.findViewById(R.id.siz);
            textView.setText("your text");
            // insert into main view 
            addContentView(v, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));

            // maybe this will be needed too: getView().invalidate();
        }
    });

    super.onPreExecute();
}

May you'll need that getView().invalidate() too.

I did not try this though, so please give me feedback, if it helps.

Hareshkumar Chhelana · Accepted Answer · 2013-10-26 05:27:13Z

-1

// try this
**main.xml**
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="5dp"
    android:orientation="vertical">
</LinearLayout>

**your_layout.xml**
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <TextView
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:id="@+id/a_text_view"/>
</LinearLayout>

**MyActivity**
public class MyActivity extends Activity  {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        View v = LayoutInflater.from(this).inflate(R.layout.your_layout, null);
        TextView textView = (TextView) v.findViewById(R.id.a_text_view);
        textView.setText("your text");
        addContentView(v, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT));
    }
}

answered Oct 26, 2013 at 5:27

Hareshkumar Chhelana

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3 Comments

Pradeep Mittal Over a year ago

Sir, the code is inflating the View. But this is not the issue. The View is not visible to me. It became visible when I rotate the screen to landscape view. Looks like it needs the screen to be refreshed maybe :)

vinay kumar Over a year ago

then call invalidate() method after adding the view to your viewgroup

Pradeep Mittal Over a year ago

For which view shall I call invalidate()? I need to run the addView function in an async task. Like View.invalidate(); Which view?

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