Question

我正在尝试使用ListActivity的OnItemListClick方法来启动一个新活动，其中包含有关列表项的更多特定信息。为了做到这一点，我正在使用How do I pass an object from one activity to another on Android?的最佳答案所建议的捆绑，但无论我尝试OnItemListClick似乎都没有做任何事情。我也试过没有通过捆绑思考导致问题，因为这里建议Using an intent to start new activity from ListActivity并且也没有做任何onClick。如果单击listview中的某个项目，它返回与该行关联的对象并将其传递给新活动，我该怎么做呢？

public class TaskList extends ListActivity {

private ArrayList<Task> stuffToDo, completed;
private TaskAdapter t_adapter;
public Button add;
private File saveFile;
private Bundle clickBundle = new Bundle();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_task_list);
    stuffToDo = new ArrayList<Task>();
    completed = new ArrayList<Task>();
    t_adapter = new TaskAdapter(this, R.layout.row_rl, stuffToDo);

    setListAdapter(t_adapter);
}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {

    super.onListItemClick(l, v, position, id);
    // Make a bundle and put the Task selected in it then pass this to the
    // intent to start the new activity
    Intent launchIntent = new Intent(getApplicationContext(), TaskDisplay.class);
    Log.d("Debug", "Intent made");
    clickBundle.clear();
    clickBundle.putSerializable("Task", stuffToDo.get(position));
    Log.d("Debug", "Task put in bundle");
    launchIntent.putExtras(clickBundle);
    this.startActivity(launchIntent);
    Log.d("Debug", "launched");


}


@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
    // TODO Auto-generated method stub
    switch (item.getItemId()) {
    case R.id.addtaskbutton:
        promptUserForInfo();
        t_adapter.notifyDataSetChanged();
        // added for debug
        saveInfo();
        return true;
    case R.id.cleartasks:
        clearTasks();
        t_adapter.notifyDataSetChanged();
        return true;
    }

    return super.onMenuItemSelected(featureId, item);
}

和我在更具体的活动中的代码

//      Set the bundle equal to the extra put with the intent
        input = this.getIntent().getExtras();
//      If there are extras(a task) then assign it to the empty task variable
        if (input != null){
            task = (Task) input.getSerializable("Task");
        }

Answer 1

这意味着你指向列表。

更改Intent launchIntent = new Intent(this, TaskDisplay.class);

到意图launchIntent = new Intent(youractivityname.this, TaskDisplay.class);

或Intent launchIntent = new Intent(getApplicationContext(), TaskDisplay.class);

并将此super.onListItemClick(l, v, position, id);列表项的第一行点击方法。

Answer 2

试试这个......

this.startActivity(launchIntent);

无法从ListActivity OnItemListClick中启动意图

2 个答案: