Question

我正在开发一个AlertDialog，它应该显示一个包含图像和文本的大小为2的列表。但是我无法让它发挥作用。

我按照这个链接
Icons in a List dialog
当我放置getActivity（）时，它没有认识到帖子的建议我把getApplicationContext（）;

public MainActivity extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_complaint);
        cameraButton = (ImageView) findViewById(R.id.cmp_camera);
        cameraButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                final String[] items = new String[]{"From Gallery", "From Camera"};
                final Integer[] icons = new Integer[]{R.drawable.ic_launcher, R.drawable.ic_drawer};
                ListAdapter adapter = new CameraPickAdapter(getApplicationContext(), items, icons);

                new AlertDialog.Builder(getApplicationContext()).setTitle("Select Image")
                        .setAdapter(adapter, new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int item) {
                                Toast.makeText(getApplicationContext(), "Item Selected: " + item, Toast.LENGTH_SHORT).show();
                            }
                        }).show();
            }
        });
    }
}

以下代码是Adapter类

CameraPickAdapter

public class CameraPickAdapter extends ArrayAdapter<String> {

    private List<Integer> images;

    public CameraPickAdapter(Context context, List<String> items, List<Integer> images) {
        super(context, android.R.layout.select_dialog_item, items);
        this.images = images;
    }

    public CameraPickAdapter(Context context, String[] items, Integer[] images) {
        super(context, android.R.layout.select_dialog_item, items);
        this.images = Arrays.asList(images);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);
        TextView textView = (TextView) view.findViewById(android.R.id.text1);
        textView.setCompoundDrawablesWithIntrinsicBounds(images.get(position), 0, 0, 0);
        textView.setCompoundDrawablePadding(
                (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 12, getContext().getResources().getDisplayMetrics()));
        return view;
    }
}

我不知道为什么我没有得到。我认为这很简单，但我发现它很难破解

Answer 1

将getApplicationContext()更改为MainActivity.this，即更改

  new AlertDialog.Builder(getApplicationContext()).setTitle("Select Image")
                        .setAdapter(adapter, new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int item) {
                                Toast.makeText(getApplicationContext(), "Item Selected: " + item, Toast.LENGTH_SHORT).show();
                            }
                        }).show();

到

new AlertDialog.Builder(MainActivity.this).setTitle("Select Image")
                    .setAdapter(adapter, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int item) {
                            Toast.makeText(MainActivity.this, "Item Selected: " + item, Toast.LENGTH_SHORT).show();
                        }
                    }).show();

Answer 2

这样做 -

new AlertDialog.Builder(MainActivity.this)

它可能适合你。

Answer 3

在尝试在 AlertDialog 上应用自定义布局之前，我遇到了同样的问题，当我将其更改为对话时效果很好请查看我的{{3 }}

自定义布局AlertDialog无法正常工作？

3 个答案: