从列表中开始活动 [英] starting activity from a list

问题描述

我试图启动一个不同的活动，每次一个项目是点击一个ListView，但我只succeded使用意图，开始一个新的活动，但如果我想通过一个活动，从一系列的活动我会被卡住，这里是我code也许有人得到了同样的问题。

 公共类ListViewExample扩展ListActivity {的String [] presidents = {
    艾森豪威尔
    约翰·肯尼迪，
    约翰逊
    尼克松，
    杰拉尔德·福特，
    吉米·卡特，
    罗纳德·里根
    乔治·H·W·布什，
    比尔·克林顿
    乔治·W·布什，
    奥巴马
};

@覆盖
公共无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.listview）;

    setListAdapter（新ArrayAdapter＆LT;字符串＆GT;（这一点，android.R.layout.simple_list_item_1，presidents））;
}
公共无效onListItemClick（
    ListView的父母，视图V，
    INT位置，长ID）
    {


     的String []欲望= {

             AutoCompleteExample
             BasicViewsExample
             DateTimePickerExample
             ListViewExample
             ViewsActivity
             AutoCompleteExample
             BasicViewsExample
             DateTimePickerExample
             ListViewExample
             ViewsActivity
             AutoCompleteExample
     };


    意图I =新的意图（欲望[位置]）;
    startActivity（ⅰ）;


}


}
 

解决方案

而不是字符串数组使用类数组

 类＆LT;＆GT; []欲望= {AutoCompleteExample.class，
                      BasicViewsExample.class，
                       //等等
                      ViewsActivity.class};
  意图I =新的意图（MyActivity.this，希望[位置]）;
  startActivity（ⅰ）;
 

I'm trying to start a different activity everytime an item is clicked on a ListView but I only succeded to start a single new activity using intent but if I want to pass an activity from an array of activities I get stuck here's my code maybe someone get the same problem

public class ListViewExample extends ListActivity{   String[] presidents = {
    "Dwight D. Eisenhower",
    "John F. Kennedy",
    "Lyndon B. Johnson",
    "Richard Nixon",
    "Gerald Ford",
    "Jimmy Carter",
    "Ronald Reagan",
    "George H. W. Bush",
    "Bill Clinton",
    "George W. Bush",
    "Barack Obama"
};

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.listview);

    setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, presidents));
}
public void onListItemClick (
    ListView parent, View v,
    int position, long id) 
    {   


     String[] desires = {

             "AutoCompleteExample",
             "BasicViewsExample",
             "DateTimePickerExample",
             "ListViewExample",
             "ViewsActivity",
             "AutoCompleteExample",
             "BasicViewsExample",
             "DateTimePickerExample",
             "ListViewExample",
             "ViewsActivity",
             "AutoCompleteExample",
     };


    Intent i = new Intent(desires[position]);
    startActivity(i);


}


}

解决方案

Instead of a String array use a class array

Class<?>[] desires = {AutoCompleteExample.class,
                      BasicViewsExample.class,
                       //etc
                      ViewsActivity.class};
  Intent i = new Intent(MyActivity.this, desires[position]);
  startActivity(i);

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