时间演算之Dates - 实例HelloDatePicker - 用java回布局activity(贴个代码),动态生成页面

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▪时间演算之Dates 时间运算之Dates Creating Date Objects NSTimeInterval secondsPerDay = 24 * 60 * 60; NSDate *tomorrow = [NSDate dateWithTimeIntervalSinceNow:secondsPerDay]; NSDate *yesterday = [NSDate dateWithTimeIntervalSinceNow:-secondsPe.........

▪ 实例HelloDatePicker 范例HelloDatePicker Android docs中的范例，简单翻译整理如下。 --------------------------------------------1、创建新项目，名称HelloDatePicker； 2、修改res/layout/main.xml，内容如下： <?xml version="1.0" encoding.........

▪ 用java回布局activity(贴个代码),动态生成页面用java来布局activity(贴个代码),动态生成页面，虽然功能上实现了但是布局上不够漂亮，很丑啊，考虑用网页的方式来实现，思路如果可以借鉴请借鉴。作用主要是动态生成一些页面控件，.........

[1]时间演算之Dates

来源: 互联网发布时间: 2014-02-18

时间运算之Dates

Creating Date Objects

NSTimeInterval secondsPerDay = 24 * 60 * 60;
NSDate *tomorrow = [NSDate
            dateWithTimeIntervalSinceNow:secondsPerDay];
NSDate *yesterday = [NSDate
            dateWithTimeIntervalSinceNow:-secondsPerDay];

To get new date objects with date-and-time values adjusted from existing date objects, use addTimeInterval:.

NSTimeInterval secondsPerDay = 24 * 60 * 60;
NSDate *today = [NSDate date];
NSDate *tomorrow, yesterday;
 
tomorrow = [today addTimeInterval:secondsPerDay];
yesterday = [today addTimeInterval:-secondsPerDay];

Basic Date Calculations

To compare dates, use the isEqualToDate:, compare:, laterDate:, and earlierDate: methods. These methods perform exact comparisons, which means they will detect subsecond differences between dates. You might want to compare dates with a less fine granularity. For example, you might want to consider two dates equal if they are within a minute of each other. If this is the case, use timeIntervalSinceDate: to compare the two dates or use a Gregorian date instead (NSCalendarDate in Objective-C, NSGregorianDate in Java). The following Objective-C code shows how to use timeIntervalSinceDate: to see if two dates are within one minute (60 seconds) of each other.

if (fabs([date2 timeIntervalSinceDate:date1]) < 60) ...

[2] 实例HelloDatePicker

来源: 互联网发布时间: 2014-02-18

范例HelloDatePicker
Android docs中的范例，简单翻译整理如下。
--------------------------------------------
1、创建新项目，名称HelloDatePicker；

2、修改res/layout/main.xml，内容如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">
    <TextView android:id="@+id/dateDisplay"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""/>
    <Button android:id="@+id/pickDate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Change the date"/>
</LinearLayout>

3、修改HelloDatePicker.java，增加成员变量定义，代码如下：

    private TextView mDateDisplay;
    private Button mPickDate;
    private int mYear;
    private int mMonth;
    private int mDay;

    static final int DATE_DIALOG_ID = 0;

4、修改HelloDatePicker.java的onCreate方法，内容如下：

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // capture our View elements
        mDateDisplay = (TextView) findViewById(R.id.dateDisplay);
        mPickDate = (Button) findViewById(R.id.pickDate);

        // add a click listener to the button
        mPickDate.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                showDialog(DATE_DIALOG_ID);
            }
        });

        // get the current date
        final Calendar c = Calendar.getInstance();
        mYear = c.get(Calendar.YEAR);
        mMonth = c.get(Calendar.MONTH);
        mDay = c.get(Calendar.DAY_OF_MONTH);

        // display the current date (this method is below)
        updateDisplay();
    }

5、修改HelloDatePicker.java增加updateDisplay方法，内容如下：

    // updates the date in the TextView
    private void updateDisplay() {
        mDateDisplay.setText(
            new StringBuilder()
                    // Month is 0 based so add 1
                    .append(mMonth + 1).append("-")
                    .append(mDay).append("-")
                    .append(mYear).append(" "));
    }

6、修改HelloDatePicker.java增加日期选择对话框，内容如下：

    // the callback received when the user "sets" the date in the dialog
    private DatePickerDialog.OnDateSetListener mDateSetListener =
            new DatePickerDialog.OnDateSetListener() {

                public void onDateSet(DatePicker view, int year, 
                                      int monthOfYear, int dayOfMonth) {
                    mYear = year;
                    mMonth = monthOfYear;
                    mDay = dayOfMonth;
                    updateDisplay();
                }
            };

7、修改HelloDatePicker.java增加onCreateDialog方法，内容如下：

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case DATE_DIALOG_ID:
        return new DatePickerDialog(this,
                    mDateSetListener,
                    mYear, mMonth, mDay);
    }
    return null;
}

8、运行项目，即可看到运行效果，如下图所示：

[3] 用java回布局activity(贴个代码),动态生成页面

来源: 互联网发布时间: 2014-02-18

用java来布局activity(贴个代码),动态生成页面，
虽然功能上实现了但是布局上不够漂亮，很丑啊，考虑用网页的方式来实现，思路如果可以借鉴请借鉴。作用主要是动态生成一些页面控件，大家有好的思路也可以提供给我啊。或者修改这段代码，layout.xml方式暂时不考虑

typeindex = 0;
		adindex = 0;
		for(int i = 0; i <list.size();i++){
			final int tempint = i;
			String flag = list.get(i).getFlg();
			RelativeLayout rel = new RelativeLayout(Act.this);
			rel.setGravity(Gravity.CENTER_HORIZONTAL);
			RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
					ViewGroup.LayoutParams.WRAP_CONTENT);
			if("1".equals(flag)){
				TextView t = new TextView(Act.this);
				t.setText("类 型:");
				t.setTextColor(R.color.define_blue);
				t.setTextSize(18);
				t.setId(1);
				RelativeLayout rel2 = new RelativeLayout(Act.this);
				RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
					ViewGroup.LayoutParams.WRAP_CONTENT);
				
				final EditText tt = new EditText(Act.this);
				tt.setBackgroundDrawable(getResources().getDrawable(R.drawable.select_edit));
				tt.setEnabled(false);
				tt.setSingleLine();
				tt.setId(2);
				ImageView image1 = new ImageView(Act.this);
				image1.setImageDrawable(getResources().getDrawable(R.drawable.select));
				image1.setOnClickListener(new OnClickListener() {
					
					@Override
					public void onClick(View v) {
						List<SelectBean> selectList = list.get(tempint).getList();
						final String[] names = new String[selectList.size()];
						final String[] ids = new String[selectList.size()];
						for(int i=0;i<selectList.size();i++){
							names[i] = selectList.get(i).getName();
							ids[i] = selectList.get(i).getId();
						}
						
						dialog =	 new AlertDialog.Builder(Act.this)
		                .setTitle("请选择类型")
		                .setSingleChoiceItems(names, typeindex, new DialogInterface.OnClickListener() {
		                    public void onClick(DialogInterface dialog, int whichButton) {
								typeindex = whichButton;
		                    }
		                }).setPositiveButton("确 定", new DialogInterface.OnClickListener() {
		                    public void onClick(DialogInterface dialog, int id) {
		                    	tt.setText(names[typeindex]);
		                    	typeStr = "&"+list.get(tempint).getArg_name()+"="+ids[typeindex];
		                    }
		               })
		               .setNegativeButton("取 消", new DialogInterface.OnClickListener() {
		            	   public void onClick(DialogInterface dialog, int id) {
		            		 
		                   }
		               }).create();
						dialog.show();
					}
				});
				rel2.addView(tt);
				lp2.addRule(RelativeLayout.RIGHT_OF, tt.getId());
				rel2.addView(image1,lp2);
				lp.addRule(RelativeLayout.RIGHT_OF,t.getId());
				
				rel.addView(t);
				rel.addView(rel2,lp);
			}else if("2".equals(flag)){
				TextView t = new TextView(Act.this);
				t.setText("前 缀:");
				t.setTextColor(R.color.define_blue);
				t.setTextSize(18);
				t.setId(1);
				RelativeLayout rel2 = new RelativeLayout(Act.this);
				RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
					ViewGroup.LayoutParams.WRAP_CONTENT);
				
				final EditText tt = new EditText(Act.this);
				tt.setBackgroundDrawable(getResources().getDrawable(R.drawable.select_edit));
				tt.setEnabled(false);
				tt.setSingleLine();
				tt.setId(2);
				ImageView image1 = new ImageView(Act.this);
				image1.setImageDrawable(getResources().getDrawable(R.drawable.select));
				image1.setOnClickListener(new OnClickListener() {
					
					@Override
					public void onClick(View v) {
						List<SelectBean> selectList1 = list.get(tempint).getList();
						final String[] namess = new String[selectList1.size()];
						final String[] idss = new String[selectList1.size()];
						for(int i=0;i<selectList1.size();i++){
							namess[i] = selectList1.get(i).getName();
							idss[i] = selectList1.get(i).getId();
						}
						
						dialog =	 new AlertDialog.Builder(Act.this)
		                .setTitle("前 缀:")
		                .setSingleChoiceItems(namess, adindex, new DialogInterface.OnClickListener() {
		                    public void onClick(DialogInterface dialog, int whichButton) {
		                    	adindex = whichButton;
		                    }
		                }).setPositiveButton("确 定", new DialogInterface.OnClickListener() {
		                    public void onClick(DialogInterface dialog, int id) {
		                    	tt.setText(namess[adindex]);
		                    	adStrx = namess[adindex];
		                    	adStr = "&"+list.get(tempint).getArg_name()+"="+idss[adindex];
		                    }
		               })
		               .setNegativeButton("取 消", new DialogInterface.OnClickListener() {
		            	   public void onClick(DialogInterface dialog, int id) {
		            	
		                   }
		               }).create();
						dialog.show();
					}
				});
				rel2.addView(tt);
				lp2.addRule(RelativeLayout.RIGHT_OF, tt.getId());
				rel2.addView(image1,lp2);
				lp.addRule(RelativeLayout.RIGHT_OF,t.getId());
				
				rel.addView(t);
				rel.addView(rel2,lp);
			}else if("3".equals(flag)){
				TextView t = new TextView(Act.this);
				t.setText("号 :");
				t.setTextColor(R.color.define_blue);
				t.setTextSize(18);
				t.setId(1);
				tt3 = new EditText(Act.this);
				tt3.setBackgroundDrawable(getResources().getDrawable(R.drawable.text));
				lp.addRule(RelativeLayout.RIGHT_OF,t.getId());
				rel.addView(t);
				rel.addView(tt3,lp);
			}else if("4".equals(flag)){
				TextView t = new TextView(Act.this);
				t.setText(" 号:");
				t.setTextColor(R.color.define_blue);
				t.setTextSize(18);
				t.setId(1);
				tt4 = new EditText(Act.this);
				tt4.setBackgroundDrawable(getResources().getDrawable(R.drawable.text));
				lp.addRule(RelativeLayout.RIGHT_OF,t.getId());
				rel.addView(t);
				rel.addView(tt4,lp);
			}else if("5".equals(flag)){
				TextView t = new TextView(Act.this);
				t.setText("代 码:");
				t.setTextColor(R.color.define_blue);
				t.setTextSize(18);
				t.setId(1);
				tt5 = new EditText(Act.this);
				tt5.setBackgroundDrawable(getResources().getDrawable(R.drawable.text));
				lp.addRule(RelativeLayout.RIGHT_OF,t.getId());
				rel.addView(t);
				rel.addView(tt5,lp);
			}else if("6".equals(flag)){
				TextView t = new TextView(Act.this);
				t.setText("编 号:");
				t.setTextColor(R.color.define_blue);
				t.setTextSize(18);
				t.setId(1);
				tt6 = new EditText(Act.this);
				tt6.setBackgroundDrawable(getResources().getDrawable(R.drawable.text));
				lp.addRule(RelativeLayout.RIGHT_OF,t.getId());
				rel.addView(t);
				rel.addView(tt6,lp);
			}else if("9".equals(flag)){
				TextView t = new TextView(Act.this);
				t.setText("号: ");
				t.setTextColor(R.color.define_blue);
				t.setTextSize(18);
				t.setId(1);
				tt9 = new EditText(Act.this);
				tt9.setBackgroundDrawable(getResources().getDrawable(R.drawable.text));
				lp.addRule(RelativeLayout.RIGHT_OF,t.getId());
				rel.addView(t);
				rel.addView(tt9,lp);
			}
			
			linear.addView(rel);
		}
	}