Check box of android menu

Check box of android menu

A beginner in android, which is currently in an android demand, needs to integrate a media player, add a checkbox in the menu, stop the player when the checkbox is selected, and start the player when the player is deselected, currently, I have enabled checkbox to stop the player.

When I unselect the checkbox, an error is reported. I haven't found the cause for a long time. The mood is bad .....

My code is as follows:
MainActivity

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@Override public boolean onOptionsItemSelected(MenuItem item) { //Switch-sats i syfte om att det kommer tillkomma fler alternativ //Switchen bygger på att hämta rätt id ifrån användarens val switch (item.getItemId()) { case R.id.action_help: //Bytar Activity till help Intent intent = new Intent(MainActivity1.this, help.class); startActivity(intent); return true; case R.id.music: final CheckBox music = (CheckBox)findViewById(R.id.music); music.setChecked(true); music.setOnClickListener(new OnClickListener(){ public void onClick(View v){ if (((CheckBox) v).isChecked()) { backsound = MediaPlayer.create(MainActivity1.this, R.raw.backsound); backsound.start(); backsound.setLooping(true); }else{ music.setChecked(false); backsound.stop(); } }}); default: return super.onOptionsItemSelected(item); }}}

Main_activity.xml

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<menu xmlns:android=http://schemas.android.com/apk/res/android > <item android:id=@+id/action_settings android:orderInCategory=100 android:showAsAction=never android:title=@string/action_settings/> <item android:id=@+id/action_help android:orderInCategory=100 android:showAsAction=never android:title=@string/help/> <item android:id=@+id/music android:title=@string/musik android:checkable=true android:checked=true />

Solution

 

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<preferencescreen xmlns:android=http://schemas.android.com/apk/res/android> <preferencecategory android:title=@string/title_category android:summary=@string/summary_category> <checkboxpreference android:title=@string/title_main android:summary=@string/summary_main android:defaultvalue=true android:key=main> checkboxpreference> preferencecategory> preferencescreen>

You only need to set setting android: dependancy to implement this function. Now you can create an xml file in the res directory, put the above xml code, and then perform the following operations:

 

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public class SettingsActivity extends PreferenceActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.preferences); } }

Of course, you can also do it in other ways, such as fragments, but this method is simpler.