android preference framework demo

package com.freedie.preferencedemo; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.widget.TextView; public class MainActivity extends Activity { TextView checkboxTv, ringtoneTv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); checkboxTv = (TextView)findViewById(R.id.checkboxTextView); ringtoneTv = (TextView)findViewById(R.id.ringtoneTextView); } @Override protected void onResume() { SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); checkboxTv.setText(String.valueOf(sharedPreferences.getBoolean("checkbox", false))); String ringtone =sharedPreferences.getString("ringtone", "unset"); ringtoneTv.setText("".equals(ringtone) ? "静音" : ringtone); super.onResume(); } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); MenuInflater menuInflater = getMenuInflater(); menuInflater.inflate(R.menu.simple_menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch(item.getItemId()){ case R.id.chooseMenu: Intent intent = new Intent(this, PreferenceDemoActivity.class); startActivity(intent); return true; } return super.onOptionsItemSelected(item); } }