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copied!<p><strong>there are two mistakes in your code</strong></p> <p><strong>1.</strong> this <code>setButtonClickListener();</code> called once in your activity i.e. in <code>onCreate()</code> ! so you r button <code>OnClickListener()</code> will work once !</p> <p><strong>2.</strong> inside <code>toggleUi()</code> don't use <code>setContentView(R.layout.linear);</code></p> <p><strong>Solution for 1.</strong> </p> <p><strong>use following code in your</strong> <code>onCreate()</code></p> <pre><code>Button toggleButton = (Button) findViewById(R.id.toggleButton); toggleButton.setOnClickListener( new View.OnClickListener() { public void onClick(View v) { if (mPhoneIsSilent) { mAudioManager .setRingerMode(AudioManager.RINGER_MODE_NORMAL); mPhoneIsSilent = false; toggleUi(); } else { mAudioManager .setRingerMode(AudioManager.RINGER_MODE_SILENT); mPhoneIsSilent = true; toggleUi(); } } }); </code></pre> <p>and remove these two lines code from <code>onCreat()</code> </p> <pre><code>setButtonClickListener(); toggleUi(); </code></pre> <p>also remove your <code>private void setButtonClickListener()</code> completely !</p> <hr> <p><strong>Solution for 2.</strong></p> <p>your <code>toggleUi()</code> <strong>should be:</strong></p> <pre><code>private void toggleUi() { ImageView imageView = (ImageView) findViewById(R.id.phone_icon); Drawable newPhoneImage; if (mPhoneIsSilent) newPhoneImage = getResources().getDrawable(R.drawable.edit_btn); else newPhoneImage = getResources().getDrawable(R.drawable.ic_launcher); imageView.setImageDrawable(newPhoneImage); } </code></pre>

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