【安卓4】事件处理——时间日期事件处理、长按事件

OnTimeChangedListener(日期和时间的事件处理)

        DatePicker  

/*取得DatePicker对象，以init()设置初始值与OnDateChangedListener()*/
DatePicker dp= (DatePicker)findViewById(R.id.DatePicker01);
dp.init (year, month, day, new OnDateChangedListener () {
    public void onDateChanged(DatePicker view,int Year,int monthOfYear,int dayOfMonth) {}
});

　　　TimePicker 

/*取得TimePicker对象,并设置为24小时制*/
TimePicker tp= (TimePicker)findViewById(R.id.TimePicker01);
tp.setIs24HourView (true);
tp.setOnTimeChangedListener (new OnTimeChangedListener () {
    public void onTimeChanged(TimePicker view, int hourOfDay, int Minute) {}
});

OnLongClickListener(长按事件)

        修改AndroidMainfest.xml文件，增加授权操作:

                <uses - permission android: name="android. permission. SET_WALLPAPER"/>

//取得TextView
    TextView info= (TextView)super. findViewById (R.id. TextView);    
//取得ImageView控件
    ImageView image= (ImageView)super. findViewById (R.id. ImageView);
    image.setOnLongClickListener(new OnLongClickListener(){      //长按监听
        public boolean onLongClick(View v) {        //长按事件
            try {
                类名.this.clearWallpaper();    //清除桌面
                //设置新的桌面背景
                类名.this.setWallpaper(
                        类名.this. image.getResources().
                        openRawResource(R.drawable.图片名));    
                //修改显示文字
                类名.this.info.setText("手机桌面背景已修改");
            } catch (IOException e) {
                类名.this.info.setText("手机桌面背景设置失败");
            }    
            return true;
        } );