Question

好的，我正在创建一个ArrayAdapter并在我的Alert Dialog中使用它，因为我不想在SingleItemSelection对话框中显示默认的单选按钮。

相反，我想要更改所选项目的背景，然后当用户按下肯定按钮时，我将执行与所选项目相关的操作。

    private void showAlertDialog()
    {
        final String[] options = getResources().getStringArray(R.array.dialog_options);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, options);

        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
        dialogBuilder.setTitle("My Dialog");

        dialogBuilder.setAdapter(adapter, new OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                Toast.makeText(getApplicationContext(), "item clicked at index " + which, Toast.LENGTH_LONG).show();
// Here I need to change the background color of the item selected and prevent the dialog from being dismissed
            }
        });

        //String strOkay = getString(R.string.okay);
        dialogBuilder.setPositiveButton("OK", null); // TODO
        dialogBuilder.setNegativeButton("Cancel", null); // nothing simply dismiss

        AlertDialog dialog = dialogBuilder.create();
        dialog.show();
    }

我正在努力解决两个问题。

如何在用户点击项目时阻止对话框被解除

如何更改用户点击时所选项目的背景

Answer 1

要防止对话框在项目点击时被忽略，您可以使用 AdapterView .OnItemClickListener而不是 DialogInterface .OnClickListener。

像这样：

dialogBuilder.setAdapter(adapter, null);
...
AlertDialog dialog = dialogBuilder.create();
alertDialog.getListView().setOnItemClickListener(
new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// do your stuff here
}
});

Answer 2

您可以将自定义ListView设置为AlertDialog的内容并设置OnItemClickListener

AlertDialog.Builder builder = new AlertDialog.Builder(this);
String[] items = ...;
ListView list = new ListView(this);
list.setAdapter(new ArrayAdapter<String>(this, android.R.layout.select_dialog_item, items));
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        public void onItemClick(AdapterView<?> arg0, View view, int pos, long id) {
            ...
        }
    });
builder.setView(list);

然后保存对话框的引用

mDialog = builder.show();

以便在必要时解雇

mDialog.dismiss();

Answer 3

如何在用户点击项目时阻止对话框被解除

如何更改用户点击时所选项目的背景

这是示例

public class MainActivity extends AppCompatActivity {
private static final String listFragmentTag = "listFragmentTag";
private static final String data[] = {"one", "two", "three", "four"};

public MainActivity() {
    super();
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

public void btnClick(View v) {
    ListFragment lf = new ListFragment();
    lf.show(getSupportFragmentManager(), listFragmentTag);
}

public static class ListFragment extends DialogFragment {
    @Override @NonNull
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder adb = new AlertDialog.Builder(getActivity());
        adb.setIcon(android.R.drawable.ic_dialog_info)
                .setTitle("List")
                .setItems(data, null)
                .setPositiveButton("OK", null); // pass your onClickListener instead of null

        // to keep dialog open after click on item
        AlertDialog ad = adb.create();
        ad.getListView().setOnItemClickListener(new AdapterView.OnItemClickListener() {
            private int colorOrg = 0x00000000;
            private int colorSelected = 0xFF00FF00;
            private View previousView;
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                // restoring color of previous view
                if(previousView != null) {
                    previousView.setBackgroundColor(colorOrg);
                }
                // changing items's BG color
                view.setBackgroundColor(colorSelected);
                previousView = view;
            }
        });

        return ad;
    }

    @Override
    public void onDismiss(DialogInterface dialog) {
        super.onDismiss(dialog);
    }

}
}

Answer 4

您可以使用setCanceledOnTouchOutside（false）或setCanceleable（false）。
为对话框布局xml的根元素标记设置选择器。

AlertDialog - 不要忽略项目点击

4 个答案: