AndroidRestart Activity from PreferenceFragment

Question

I declared my PreferenceFragment within a SettingsActivity like this

public class ChordsSettings extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    getFragmentManager().beginTransaction()
            .replace(android.R.id.content, new MyPreferenceFragment())
            .commit();
}

public static class MyPreferenceFragment extends PreferenceFragment {
    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings_preferences);
    }
}
}

I did it like this and didn't create a Fragment on top of the MainActivity because I need to be able to use the back button to get from the SettingsActivity to the MainActivity and this seamed like the only way to go to achieve that.

I need to restart my MainActivity once the preferences changed.

I tried sending a Broadcast from the preferenceFragment but sendBroadcast() cannot be used from a static context. Is there any other way I can achieve this?

Answer 1

Your MainActivity should probably look like this. Note that when btnGoToSetting is clicked finish() method is called. This is for closing the currrent Activity.

MainActivity.java

public class MainActivity extends Activity {

    Button btnGoToSetting;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnGoToSetting = (Button)findViewById(R.id.btnGoToSetting);
        btnGoToSetting.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
                Intent intent = new Intent(MainActivity.this, SettingsActivity.class);
                startActivity(intent);
            }
        });
    }

}

SettingsActivity.java

public class SettingsActivity extends Activity {

    Button btnSavePreferences;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        btnSavePreferences = (Button)findViewById(R.id.btnSavePreferences);
        btnSavePreferences.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Here is where you save all your preferences
                yourSaveFunction();
                finish();
                Intent intent = new Intent(SettingsActivity.this, MainActivity.class);
                startActivity(intent);
            }
        });
    }

    @Override
    public void onBackPressed() {
        finish();
        Intent intent = new Intent(SettingsActivity.this, MainActivity.class);
        startActivity(intent);
    }

}

Note : There is another way to resfresh you data in MainActivity by making your data asynchronous so that everytime the data changes it will be refresh automatically.