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PODoing an Android Silent Mode App, can't even start Main Activity?
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  1. PODoing an Android Silent Mode App, can't even start Main Activity?
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    copied!<p>I'm working with the Android Application Development for Dummies book by Donn Felker. Specifically, I'm working with the Silent Mode App. </p> <p>It should be simple to follow the instructions step by step, but as it turns out I can't even start the main activity without crashing the app. I must've gone over my code a dozen times and I can't still figure out what's wrong and make it work without LogCat firing errors like crazy. </p> <p>Debug device is a Samsung Galaxy SII w/ Android 4.0.3.</p> <p>Here's the MainAcitivity class</p> <pre><code>public class MainActivity extends Activity { Button m_toggleButton = (Button)findViewById(R.id.toggleButton); AudioManager m_audio = (AudioManager)getSystemService(AUDIO_SERVICE); boolean m_isPhoneSilent; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); checkMode(); toggleImage(); generateClick(); } @Override protected void onResume() { super.onResume(); checkMode(); toggleImage(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } private void checkMode() { m_audio = (AudioManager)getSystemService(Context.AUDIO_SERVICE); switch(m_audio.getRingerMode()) { case AudioManager.RINGER_MODE_NORMAL: m_isPhoneSilent = false; break; case AudioManager.RINGER_MODE_SILENT: m_isPhoneSilent = true; break; } } private void generateClick() { m_toggleButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (m_isPhoneSilent == true) { m_audio.setRingerMode (AudioManager.RINGER_MODE_NORMAL); m_isPhoneSilent = false; } else { m_audio.setRingerMode (AudioManager.RINGER_MODE_SILENT); m_isPhoneSilent = true; } toggleImage(); } }); } private void toggleImage() { ImageView imageView = (ImageView) findViewById(R.id.phone_icon); Drawable newAsset; if (m_isPhoneSilent == true) { newAsset = getResources().getDrawable(R.drawable.phone_silent); } else { newAsset = getResources().getDrawable(R.drawable.phone_on); } imageView.setImageDrawable(newAsset); } </code></pre> <p>I've tried to debug, but I haven't found the problem. Please help.</p>
 

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