Hello Everyone!
I am a begginer in Java for Android development. I am reading a book
called "Android Application Development for Dummies". In chapter 5 of the
book, the following code snippet is given which is not
working.
I am simply not able to get the app to display on the android emulator and
work correctly.
Can someone please help me know what I'm doing wrong within the code?
Enter code here...
package helloandroid.android.dummies.com.silentmodetoggle;
import android.support.v7.app.AppCompatActivity;
import android.graphics.drawable.Drawable;
import android.media.AudioManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
private AudioManager mAudioManager;
private boolean mPhoneIsSilent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setButtonClickListener();
mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
checkIfPhoneIsSilent();
setButtonClickListener();
}
private void setButtonClickListener() {
Button toggleButton = (Button) findViewById(R.id.toggleButton);
toggleButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (mPhoneIsSilent) {
//Change back to silent mode
mAudioManager
.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
mPhoneIsSilent = false;
} else {
// Change to silent mode
mAudioManager
.setRingerMode(AudioManager.RINGER_MODE_SILENT);
mPhoneIsSilent = true;
}
// Now toggle the UI again
toggleUI();
}
});
}
/**
* Checks to see if the phone is currently in silent mode
*/
private void checkIfPhoneIsSilent() {
int ringerMode = mAudioManager.getRingerMode();
if (ringerMode == AudioManager.RINGER_MODE_SILENT) {
mPhoneIsSilent = true;
} else {
mPhoneIsSilent = false;
}
}
/**
* Toggles the UI images from silent to normal and vice versa
*/
private void toggleUI() {
ImageView imageView = (ImageView) findViewById(R.id.phone_icon);
Drawable newPhoneImage;
if (mPhoneIsSilent) {
newPhoneImage = getResources(drawable.phone_silent
}
else {
newPhoneImage =
getResources(drawable.phone_on);
}
imageView.setImageDrawable(newPhoneImage);
}
@Override
protected void onResume() {
super.onResume();
checkIfPhoneIsSilent();
toggleUI();
}
}
All help is appreciated.
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