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POHow do I change an image when clicking a button?
 

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  1. POHow do I change an image when clicking a button?
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    <p>so i am trying to change an image when a button below it is clicked. I am trying to toggle the phone from normal to silent mode and have a picture change according to the state of the phone.</p> <p>I am following a book and dont know what is wrong ( I am not copy pasting cuz that creates problems). Good news though. Although the picture does not change when the phone is toggled to silent mode, When I reopen the app with the silent mode already on, the image changes to what its supposed to be when its on silent. And when I toggle it back to normal mode, it works but does not change its image till I close and reopen the app and the system reads the state of the phone. I have no idea whats wrong but heres my code:</p> <pre><code>private AudioManager mAudioManager; private boolean mPhoneIsSilent; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.linear); mAudioManager= (AudioManager)getSystemService (AUDIO_SERVICE); checkIfPhoneIsSilent(); setButtonClickListener(); toggleUi(); } private void setButtonClickListener(){ 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; } else{ mAudioManager.setRingerMode(AudioManager.RINGER_MODE_SILENT); mPhoneIsSilent=true; } } } ); } private void toggleUi() { ImageView imageView=(ImageView)findViewById(R.id.phone_icon); Drawable newPhoneImage; if(mPhoneIsSilent) newPhoneImage=getResources().getDrawable(R.drawable.mute); else newPhoneImage=getResources().getDrawable(R.drawable.unmute); imageView.setImageDrawable(newPhoneImage); setContentView(R.layout.linear); } private void checkIfPhoneIsSilent() { int ringerMode=mAudioManager.getRingerMode(); if(ringerMode==AudioManager.RINGER_MODE_SILENT) mPhoneIsSilent=true; else mPhoneIsSilent=false; } </code></pre> <p>and here is the XML to go along with it:</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" &gt; &lt;ImageView android:id="@+id/phone_icon" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:src="@drawable/unmute" /&gt; &lt;Button android:id="@+id/toggleButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:text="Toggle Silent Mode"/&gt; &lt;/LinearLayout&gt; </code></pre>
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