Question

我有一个ListView，它包含来自解析的xml的数据。所以这是我的示例代码：我不能从列表视图到新活动

    list=(ListView)findViewById(R.id.list);
    // Getting adapter by passing xml data ArrayList
    adapter=new LazyAdapter(this, songsList);           
    list.setAdapter(adapter);

    list.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {

             String title = ((TextView) view.findViewById(R.id.title)).getText().toString();
             String date = ((TextView) view.findViewById(R.id.artist)).getText().toString();

             Intent i = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
             i.putExtra(KEY_HEADLINE, title);
             i.putExtra(KEY_ARTICLEDATE, date);
             startActivity(i);
        }
      });

Answer 1

getApplicationContext()几乎总是错的。你需要像Ashish所说的那样传递当前Activity的Context， getApplicationContext()返回当前进程的单个全局Application对象的上下文。这通常只应在需要生命周期与当前上下文分离的上下文时使用，该上下文与进程的生命周期而不是当前组件相关联。在dev.android.com

了解更多信息

Answer 2

您正在Intent中传递Application上下文。传递活动上下文。

         Intent i = new Intent(YourActivity.this, SingleMenuItemActivity.class);
         i.putExtra(KEY_HEADLINE, title);
         i.putExtra(KEY_ARTICLEDATE, date);
         startActivity(i);

Answer 3

您尝试从getApplicationContext()课程致电OnItemClickListener，但这是一种活动方法。

例如，您的活动名称为MyActivity。所以你应该把它称为MyActivity.this.getApplicationContext()。

Answer 4

first You have to add
list.setClickable("true");

then, get the listview position
  Object o = lv.getItemIdAtPosition(position);
  int posix = Integer.parseInt(o.toString());

So, Final code will be..

list=(ListView)findViewById(R.id.list);
    // Getting adapter by passing xml data ArrayList
    adapter=new LazyAdapter(this, songsList);           
    list.setAdapter(adapter);
    list.setClickable("true");

    list.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {

             String title = ((TextView) view.findViewById(R.id.title)).getText().toString();
             String date = ((TextView) view.findViewById(R.id.artist)).getText().toString();
 Object o = lv.getItemIdAtPosition(position);
  int posix = Integer.parseInt(o.toString());
             Intent i = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
             i.putExtra(KEY_HEADLINE, title);
             i.putExtra(KEY_ARTICLEDATE, date);
             startActivity(i);
        }
      });

我无法将listview用于新活动

4 个答案: