安卓 使用TimePicker进行时间选择器 定闹钟一类时间滚动选定 （21）

在闹钟里面，我们都会看到一个时分滚动的条，里面可以选择24小时里面各个时间，这里用TimePicker可以实现一个时分的时间选择器。

首先写一个布局放入两种TimePicker：

实现一个Activity：

public class TimePickActivity extends Activity implements View.OnClickListener{

    private TimePicker timePicker_spinner;
    private TimePicker timePicker_clock;
    private Button btn_change;
    private Button btn_setData;
    private LinearLayout layout_clock;
    private LinearLayout layout_spinner;

    private boolean change_Timepicker = false;
    private int clock_hour;
    private int clock_minute;
    private int spinner_hour;
    private int spinner_minute;

    private String clock;
    private String spinner;

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

        layout_clock = findViewById(R.id.layout_clock);
        layout_spinner = findViewById(R.id.layout_spinner);

        btn_change = findViewById(R.id.change_timepicker);
        btn_setData = findViewById(R.id.setdata_timepicker);

        timePicker_spinner = findViewById(R.id.time_piker_spinner);
        timePicker_clock = findViewById(R.id.time_picker_clock);

        btn_change.setOnClickListener(this);
        btn_setData.setOnClickListener(this);

        //设置其显示方式为24小时（如果参数为false则分为AM与PM显示）
        timePicker_clock.setIs24HourView(true);
        timePicker_spinner.setIs24HourView(true);

        //自动获取焦点
        timePicker_spinner.setDescendantFocusability(TimePicker.FOCUS_BLOCK_DESCENDANTS);
        timePicker_clock.setDescendantFocusability(TimePicker.FOCUS_BLOCK_DESCENDANTS);

        //设置初始值（即00:00）
        timePicker_clock.setCurrentHour(0);
        timePicker_clock.setCurrentMinute(0);
        timePicker_spinner.setCurrentHour(0);
        timePicker_spinner.setCurrentMinute(0);

        //通过OnTimeChangedListener来得到当前的时与分
        timePicker_spinner.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
            @Override
            public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
                spinner_hour = hourOfDay;
                spinner_minute = minute;
            }


        });

        timePicker_clock.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
            @Override
            public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
                clock_hour = hourOfDay;
                clock_minute = minute;

            }
        });
    }

    @Override
    public void onClick(View v) {
        switch(v.getId()){
            //使用该按钮更换两种形式Clock Spinner
            case R.id.change_timepicker:
                if(!change_Timepicker){
                    layout_spinner.setVisibility(View.GONE);
                    layout_clock.setVisibility(View.VISIBLE);
                    change_Timepicker = !change_Timepicker;
                }else{
                    layout_spinner.setVisibility(View.VISIBLE);
                    layout_clock.setVisibility(View.GONE);
                    change_Timepicker = !change_Timepicker;
                }
                break;

            //得到我们所需求的时间
            case R.id.setdata_timepicker:
                if(!change_Timepicker){
                    spinner = getTimeString(spinner_hour,spinner_minute);
                    Toast.makeText(TimePickActivity.this, spinner, Toast.LENGTH_SHORT).show();
                }else{
                    clock = getTimeString(clock_hour,clock_minute);
                    Toast.makeText(TimePickActivity.this, clock, Toast.LENGTH_SHORT).show();
                }
        }
    }

    public String getTimeString(int hour, int minute){
        String string_hour, string_minute;
        // 显示格式：xx:xx
        // for example:03:07
        if(hour < 10){
            string_hour = "0" + hour;
        }else{
            string_hour = "" + hour;
        }

        if(minute < 10){
            string_minute = "0" + minute;
        }else {
            string_minute = "" + minute;
        }
        return string_hour + "：" + string_minute;
    }
}