Question

我使用以下代码生成自定义ListView。一切都运行正常，但是当用户点击列表视图时，我无法转到另一个类，因为Intents不能在非Activity类中使用。有没有办法为下面的代码启动活动???

public class CustomAdapter extends BaseAdapter  {
String[] result;
Context context;
int[] imageId;
private static LayoutInflater inflater = null;

public CustomAdapter(MainActivityList mainActivity, String[] prgmNameList,
        int[] prgmImages) {
    // TODO Auto-generated constructor stub
    result = prgmNameList;
    context = mainActivity;
    imageId = prgmImages;
    inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return result.length;
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

public class Holder {
    TextView tv;
    ImageView img;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    Holder holder = new Holder();
    View rowView;
    rowView = inflater.inflate(R.layout.program_list, null);
    holder.tv = (TextView) rowView.findViewById(R.id.textViewlist);
    holder.img = (ImageView) rowView.findViewById(R.id.imageViewlist);
    holder.tv.setText(result[position]);
    holder.img.setImageResource(imageId[position]);

    rowView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            switch(position)
            {
            case 0:
            {
                //Intent is not working here
                                    //Here i need some help 
            }
            }
        }
    });
    return rowView;
}

}

我被困在项目的这一部分，请帮助我..

Answer 1

使用活动上下文

Intent intent = new Intent(context,AnotherActivity.class);
context.startActivity(intent);

Answer 2

为了不过度使用Adapter，我会使用registerForContextMenu(convertView)为每个行注册一个上下文菜单。这样，您就必须在onCreateContextMenu()之外实施onContextItemSelected()和Adapter，可能在填充Activity的{{1}}内，并定义<{1}}里面的ListView，它可以正常工作。

以下是一个例子：

startActivity()

Answer 3

你也可以这样做..

public void onClick(View v){
Intent yourIntent = new Intent(context,AnotherActivity.class);
yourIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK |Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
v.getContext().startActivity(yourIntent);

}

Answer 4

   TextView mealName = (TextView) view.findViewById(R.id.mealNameDietTXT);
    mealName.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v)
        {
            SessionClass.subMealID=mealsArray.get(position).getMealComponentId();
            Intent i = new Intent(dietRadioAdapter.this.context, dietDetails.class);
           dietRadioAdapter.this.context.startActivity(i);

        }
    });

Answer 5

list.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1,int pos, long arg3) {
        Intent intent= new Intent(currentClass.this,secondActivity.class);
        currentClass.this.startActivity(intent);
        finish();                       
    }
});

如何从扩展BaseAdapter的类启动一个Activity？

5 个答案: