Value sharing solution between Android activity, sharing parent class values between tabhost

1.tabhost solution for sharing parent class values

Dianzhanliebiao.java is a value-Zhuyemian.java page, and the Tabhost,dianzhangaikuang.java is the specific sub-layout of Tabhost.

First Dianzhanliebiao.java the value of the pass

Intent.putextra ("id", "1234");
Intent.setclass (Dianzhanliebiao.this, Zhuyemian.class);
Dianzhanliebiao.this.startActivity (Intent);

Zhuyemian.java get the value from Dianzhanliebiao.java
Intent=getintent ();
String Id=intent.getstringextra ("id");

Dianzhangaikuang.java gets the ID in the following ways:

Intent Intent = GetParent (). Getintent ();
String id = intent.getstringextra ("id");

2.activity between the values, personal feeling with sharedpreferences better, but need to declare a global variable (can also be used for value sharing between tabhost)

Generally built a constant class, I am Constant.java

In the declaration public static sharedpreferences Sharedata;

Zhuyemian.java Pass-through value

Constant.sharedata =getsharedpreferences ("Rixin", 0);//The first parameter is the name of the store, and the second argument is how the file is opened
Editor Editor=constant.sharedata.edit ();
Editor.putstring ("id", "1234");
Editor.commit (); A little to commit, or else the page can't get

Fadianliang.java Getting Data

Constant.sharedata=getsharedpreferences ("Rixin", 0);
String id=constant.sharedata.getstring ("id", NULL);

3. String reshaping

Integer.parseint (string,10);//String converted to 10 binary

Double.parsedouble (string);//string converted to double

string.valueof (100);//plastic change to string

Array conversion to List

1. string[] arr = new string[] {"str1", "str2"};
2. list<string> list = Arrays.aslist (arr);

List conversions to arrays

1. list<string> list = new arraylist<string> ();
2. List.add ("str1");
3. List.add ("str2");
4. int size = List.size ();
5. String[] arr = (string[]) List.toarray (new string[size]); The second interface is used, and the return value and parameters are both results

4. Get the item content for each ListView

Get the contents of each item, I am a custom ListView with TextView control inside it
Tv_name= (TextView) View.findviewbyid (r.id.tv_name);
String Dzmc=tv_name.gettext (). toString ();

Value sharing solution between Android activity, sharing parent class values between tabhost