Question

我正在使用适配器类来填充我的列表视图，但我的列表视图中的每个项目都有两个文本视图，我想要将其设置为监听器。所以我在适配器类中设置它，当我尝试显示吐司时它工作正常。

但问题是我在OnClickListener中无法启动活动。该应用程序崩溃。请帮助或建议另一种方法来实现相同的目标。 Manifest中已经提到了该活动。

这是我的代码： -

public class Adapter_NearMe_TyreWorx extends ArrayAdapter<List_NearMe> implements View.OnClickListener {
    ArrayList<List_NearMe> arraylist;



    private Context context;
    private List<List`enter code here`_NearMe> list;
    public Adapter_NearMe_TyreWorx(Context context, int resource, List<List_NearMe> objects) {
        super(context, resource, objects);
        this.context = context;
        this.List = objects;
        arraylist = new ArrayList<List_NearMe>();
        arraylist.addAll(List);

    }
    TextView Btn_Call;
     String Fac_landmark;
    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.canvas_two, parent, false);
        List_NearMe list= list.get(position);

        String Fac_name=list.getName();
         Fac_landmark=list.getLandmark();

        String Fac_gMap=list.getgMap();
        String Fac_contact=list.getContact();

        TextView distance=(TextView)view.findViewById(R.id.fac_distance);
        TextView Fac_Name=(TextView)view.findViewById(R.id.fac_name);
        TextView Fac_Address=(TextView)view.findViewById(R.id.fac_address);
         Btn_Call=(TextView)view.findViewById(R.id.btn_call);
        TextView Btn_Go=(TextView)view.findViewById(R.id.btn_go);

        Btn_Go.setOnClickListener(this);
        return view;
    }



    public void onClick(View v) {
       Toast.makeText(getContext(),"Toast text",LENGTH.SHORT).show(); //working toast code



        Intent intent = new Intent(getContext(), SampleActivity.class);
        getContext().startActivity(intent);

    }
}

Answer 1

你必须添加一个Intent标志来从非活动类private ViewFlipper viewFlipper; private float lastX; viewFlipper = (ViewFlipper) findViewById(R.id.viewflipper); public boolean onTouchEvent(MotionEvent touchevent) { switch (touchevent.getAction()) { case MotionEvent.ACTION_DOWN: lastX = touchevent.getX(); break; case MotionEvent.ACTION_UP: float currentX = touchevent.getX(); // Handling left to right screen swap. if (lastX < currentX) { // If there aren't any other children, just break. if (viewFlipper.getDisplayedChild() == 1) break; // c.add(Calendar.DAY_OF_MONTH,-1); // formattedDate = df.format(c.getTime()); // txt1.setText(formattedDate); // Next screen comes in from left. viewFlipper.setInAnimation(this, R.anim.slide_in_from_left); // Current screen goes out from right. viewFlipper.setOutAnimation(this, R.anim.slide_out_to_right); // Display next screen. viewFlipper.showNext(); } // Handling right to left screen swap. if (lastX > currentX) { // If there is a child (to the left), kust break. if (viewFlipper.getDisplayedChild() == 1) break; // c.add(Calendar.DAY_OF_MONTH,1); // formattedDate = df.format(c.getTime()); // txt1.setText(formattedDate); // Next screen comes in from right. viewFlipper.setInAnimation(this, R.anim.slide_in_from_right); // Current screen goes out from left. viewFlipper.setOutAnimation(this, R.anim.slide_out_to_left); // Display previous screen. viewFlipper.showPrevious(); } break; } return false; }传递一个Intent，在intent中添加这个标志会很好地尝试传递你的Intent：

Intent.FLAG_ACTIVITY_NEW_TASK

或

Intent intent = new Intent(getContext(), SampleActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getContext().startActivity(intent);

Answer 2

   textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                context.startActivity(new Intent(context.getApplicationContext(), SampleActivity.class));
            }
        });

在您在适配器的构造函数中设置的上下文中调用该方法。

因为startActivity()只能从应用程序上下文中的方法启动，因为你的适配器不存在，你必须引用你在{{1}提供的context您的适配器类

Answer 3

用上下文替换getContext()。

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

可以显示吐司但不能启动活动

3 个答案: