Question

目前我有一个正确填充的ListView。当点击一行时，我有这个回电：

   private void registerClickCallBack() {
        ListView listView = (ListView) findViewById(R.id.carsListView);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View viewClicked, int position, long id) {
                Car clickedCar = myCars.get(position);
                String message = "Your password \""+clickedCar.getMake() + "\" has been copied to your clipboard ";
                Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
                ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
                clipboard.setText(clickedCar.getMake().toString());
                Intent intent = new Intent(getApplicationContext(), view_selected_item.class);

                startActivityForResult(intent, 0);
                TextView tv = (TextView) findViewById(R.id.asdasd); // I have made sure asdasd is really a value
                tv.setText("asd"); // tv is null

            }
        });
    }

如果注释掉这两行，则上述代码有效。

TextView tv = (TextView) findViewById(R.id.asdasd); // I have made sure asdasd is really a value
tv.setText("asd"); // tv is null

目的是让调用创建startActivityForResult所做的新视图。如何在新创建的页面上为文本字段设置值。

基本上，我问我如何将信息传递给尚未创建的视图。在本例中为view_selected_item.class

Answer 1

要通过Intent传递信息，请使用额外内容。

例如intent.putExtra("key", "value")，在您的活动中，使用getIntent().getStringExtra("key")

将信息添加到尚未加载的视图

1 个答案: