一个小demo，selecotor pressd selector 两种状态的区别，实体类的作用域，程序退出的区别，Timer schedule的应用

本文链接：https://blog.youkuaiyun.com/bsddcxn/article/details/50260323

本文详细介绍了基于Android的设置界面实现与数据持久化管理，包括数据展示、设置按钮事件响应、数据更新及定时任务执行，以及设置活动的交互逻辑。

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                                                                                       MainActivity

public class MainActivity extends ActionBarActivity {

    TextView show,setting;
    Dao dao = Dao.getInstance();
    int i = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
            initView();
            initListener();

    }
    boolean flg=false;
    private void initListener() {
        setting.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this,SettingActivity.class);
                startActivity(intent);
                if (flg==true){
                    flg=false;
                }else {
                    flg=true;
                }
                setting.setSelected(flg);
                final Timer timer = new Timer();
                timer .schedule(new TimerTask() {
                       @Override
                       public void run() {
                           i++;
                           Log.e("=============", "youzhadan" + i);
                           if (i==5){
                               timer.cancel();
                           }
                       }
                   }, 0, 10000);
            }
        });
    }

    private void initView() {
        show= (TextView) findViewById(R.id.show);
        String name =dao.getName();
        show.setText(name);
        setting= (TextView) findViewById(R.id.setting);
    }

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        if(event.getKeyCode()==KeyEvent.KEYCODE_BACK){
               System.exit(0);
        }
        return super.dispatchKeyEvent(event);
    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
    }
}

                                          
                                           SettingActivity

 public class SettingActivity extends ActionBarActivity{
    TextView open,close,back;
    Dao dao= Dao.getInstance();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_setting);
        initView();
        initListener();
        Log.e("=====", dao.toString());
    }
    private void initListener() {
        open.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dao.setName("zhangsan");

            }
        });
        close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dao.setName("lisi");
            }
        });
        back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
            }
        });

    }

    private void initView() {
        open = (TextView) findViewById(R.id.open);
        close = (TextView) findViewById(R.id.close);
        back = (TextView) findViewById(R.id.back);
    }
}

Dao

 public class Dao implements Serializable{
    public static Dao instance;
    public static Dao getInstance(){
        if(instance==null){
            instance = new Dao();
        }
        return instance;
    }
    String Name;
    char Sex;
    int  age;

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    public char getSex() {
        return Sex;
    }

    public void setSex(char sex) {
        Sex = sex;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}