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POPopUp Window does not appear when i click
 

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    <p>I am quite new in android .I want a popup window in my application. i have a TextView and a button in my activity_main.xml file, and a TextView and two Buttons in the popup.xml file here are these files</p> <pre><code>popup.xml file &lt;TableLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/popup_element" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;TableRow android:id="@+id/tableRow1" android:layout_width="wrap_content" android:layout_height="wrap_content" &gt; &lt;TextView android:id="@+id/txt1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="This is popoup" /&gt; &lt;/TableRow&gt; &lt;TableRow android:id="@+id/tableRow2" android:layout_width="wrap_content" android:layout_height="wrap_content" &gt; &lt;Button android:id="@+id/Unpair" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Unpair" /&gt; &lt;Button android:id="@+id/Cancel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="cancel" /&gt; &lt;/TableRow&gt; &lt;/TableLayout&gt; </code></pre> <p>here is the activity_main.xml file</p> <pre><code>activity_main.xml &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" &gt; &lt;TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /&gt; &lt;Button android:id="@+id/btn1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView1" android:layout_marginLeft="18dp" android:layout_marginTop="28dp" android:layout_toRightOf="@+id/textView1" android:text="Cick me" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>i want to display a popup window when i click the "click me" button. But popup doesn't appear when i do press the button</p> <pre><code>The java code package com.example.ctrckerapp; import android.os.Bundle; import android.widget.*; import android.app.Activity; import android.view.*; import android.content.*; public class MainActivity extends Activity { private PopupWindow pw; private Button Cancel; private Button Unpair; private Button Click; View layout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Click=(Button)findViewById(R.id.btn1); Click.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { initiatePopup(); } }); try{ Cancel.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { pw.dismiss(); } }); layout.post(new Runnable(){ public void run() { pw.showAtLocation(layout, Gravity.BOTTOM, 100, 700); } }); }catch(Exception e){ Toast.makeText(getApplicationContext(), e.toString(),Toast.LENGTH_LONG).show(); } } public void initiatePopup() { try{ LayoutInflater inflater= (LayoutInflater)MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); layout=inflater.inflate(R.layout.popup, (ViewGroup)findViewById(R.id.popup_element)); pw=new PopupWindow(layout,300,670,true); Cancel =(Button)layout.findViewById(R.id.Cancel); Unpair=(Button)layout.findViewById(R.id.Unpair); }catch(Exception e){ Toast.makeText(getApplicationContext(), e.toString(),Toast.LENGTH_LONG).show(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } } </code></pre>
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