setting.java

android开发入门与实践源代码

package com.iceskysl.iTracks;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;

public class Setting extends Activity {
    private static final String TAG = "Setting";
	//定义菜单需要的常量
	private static final int MENU_MAIN = Menu.FIRST + 1;
	private static final int MENU_NEW = MENU_MAIN + 1;
	private static final int MENU_BACK = MENU_NEW + 1;;	

	// 保存个性化设置
	public static final String SETTING_INFOS = "SETTING_Infos";
	public static final String SETTING_GPS = "SETTING_Gps";
	public static final String SETTING_MAP = "SETTING_Map";
	public static final String SETTING_GPS_POSITON = "SETTING_Gps_p";
	public static final String SETTING_MAP_POSITON = "SETTING_Map_p";
	
	private Button button_setting_submit;
	private Spinner field_setting_gps;
	private Spinner field_setting_map_level;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.setting);
    	setTitle(R.string.menu_setting);
		findViews();
		setListensers();
		restorePrefs();
    }
    
	private void findViews() {
		Log.d(TAG, "find Views");
		button_setting_submit = (Button) findViewById(R.id.setting_submit);
		field_setting_gps = (Spinner) findViewById(R.id.setting_gps);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this, R.array.gps, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        field_setting_gps.setAdapter(adapter);
        
		field_setting_map_level = (Spinner) findViewById(R.id.setting_map_level);
        ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(
                this, R.array.map, android.R.layout.simple_spinner_item);
        adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        field_setting_map_level.setAdapter(adapter2);
	}
	
	// Listen for button clicks
	private void setListensers() {
		Log.d(TAG, "set Listensers");
		button_setting_submit.setOnClickListener(setting_submit);
	}
	private Button.OnClickListener setting_submit = new Button.OnClickListener() {
		public void onClick(View v) {
			Log.d(TAG, "onClick new_track..");
			try {
				String gps = (field_setting_gps.getSelectedItem().toString());
				String map = (field_setting_map_level.getSelectedItem()
						.toString());
				if (gps.equals("") || map.equals("")) {
					Toast.makeText(Setting.this,
							getString(R.string.setting_null),
							Toast.LENGTH_SHORT).show();
				} else {
					//保存设定
					storePrefs();
					Toast.makeText(Setting.this,
							getString(R.string.setting_ok),
							Toast.LENGTH_SHORT).show();
					//跳转到主界面
					Intent intent = new Intent();
					intent.setClass(Setting.this, iTracks.class);
					startActivity(intent);
				}
			} catch (Exception err) {
				Log.e(TAG, "error: " + err.toString());
				Toast.makeText(Setting.this, getString(R.string.setting_fail),
						Toast.LENGTH_SHORT).show();
			}
		}
	};
	
	// Restore preferences
	private void restorePrefs() {
		SharedPreferences settings = getSharedPreferences(SETTING_INFOS, 0);
		int setting_gps_p = settings.getInt(SETTING_GPS_POSITON, 0);
		int setting_map_level_p = settings.getInt(SETTING_MAP_POSITON, 0);
		Log.d(TAG, "restorePrefs: setting_gps= "+ setting_gps_p + ",setting_map_level=" + setting_map_level_p);

		if (setting_gps_p != 0 && setting_map_level_p != 0) {
			field_setting_gps.setSelection(setting_gps_p);
			field_setting_map_level.setSelection(setting_map_level_p);
			button_setting_submit.requestFocus();
		}else if(setting_gps_p != 0 ){
			field_setting_gps.setSelection(setting_gps_p);
			field_setting_map_level.requestFocus();
		}else if(setting_map_level_p != 0){
			field_setting_map_level.setSelection(setting_map_level_p);
			field_setting_gps.requestFocus();
		}else{
			field_setting_gps.requestFocus();
		}
	}
	
	@Override
	protected void onStop(){
		super.onStop();
		Log.d(TAG, "save setting infos");
		// Save user preferences. We need an Editor object to
		// make changes. All objects are from android.context.Context
		storePrefs();
	}

	//保存个人设置
	private void storePrefs() {
		Log.d(TAG, "storePrefs setting infos");
		SharedPreferences settings = getSharedPreferences(SETTING_INFOS, 0);
		settings.edit()
			.putString(SETTING_GPS, field_setting_gps.getSelectedItem().toString())
			.putString(SETTING_MAP, field_setting_map_level.getSelectedItem().toString())
			.putInt(SETTING_GPS_POSITON, field_setting_gps.getSelectedItemPosition())
			.putInt(SETTING_MAP_POSITON, field_setting_map_level.getSelectedItemPosition())
			.commit();		
	}
	
	// 初始化菜单
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		super.onCreateOptionsMenu(menu);
		menu.add(0, MENU_MAIN, 0, R.string.menu_main).setIcon(
				R.drawable.icon).setAlphabeticShortcut('M');
		menu.add(0, MENU_NEW, 0, R.string.menu_new).setIcon(
				R.drawable.new_track).setAlphabeticShortcut('N');
		menu.add(0, MENU_BACK, 0, R.string.menu_back).setIcon(
				R.drawable.back).setAlphabeticShortcut('E');
		return true;
	}
	
	// 当一个菜单被选中的时候调用
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		Intent intent = new Intent();
		switch (item.getItemId()) {
		case MENU_NEW:
			intent.setClass(Setting.this, NewTrack.class);
			startActivity(intent);
			return true;
		case MENU_MAIN:
			intent.setClass(Setting.this, iTracks.class);
			startActivity(intent);
			return true;
		case MENU_BACK:
		    finish();
			break;
		}
		return true;
	}
	
}