如何显示带有 FAB 单击的自定义对话框

Question

我尝试创建一个带有布局的自定义对话框。 我还没有向对话框添加任何功能。 目前，我正在尝试通过从主活动单击FAB来启动它。

这是我的自定义对话框：

public class GenerateDialog extends Fragment implements DialogInterface.OnCancelListener, DialogInterface.OnDismissListener {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.dialog_layout, container, false);
    }
    ...
}

这是我的MainActivity. 我不知道我应该如何在onClick中启动对话框. 我尝试使用意图，但它抛出了一个错误，将对话框转换为活动：

public class MainActivity extends AppCompatActivity {
    ...
    GenerateDialog generateDialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ...
        generateDialog = new GenerateDialog();
        floatingActionButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Show GenerateDialog
            }
        });
    }
}

Answer 1

在执行类似操作后，您的对话框类应该扩展对话框而不是片段。它应该是：public class GenerateDialog extends Dialog

然后在构造函数上给它膨胀：

public class GenerateDialog extends Dialog {
public GenerateDialog(@NonNull Context context) {
        super(context, android.R.style.Theme_NoTitleBar_Fullscreen);
        setContentView(R.layout.dialog_layout);
    }
 … 
}

在 FAB 侦听器上，在启动对象后，只需调用 show(((例如，如果您的对象名为 generateDialog，则在实例化它后执行generateDialog.show();，因为它是出现对话框所必需的(。

F.i.：

public class MainActivity extends AppCompatActivity {
    ...
    GenerateDialog generateDialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ...
        generateDialog = new GenerateDialog(this);
        floatingActionButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                generateDialog.show();
            }
        });
    }
}

Answer 2

您可以像这样显示对话框

public class CustomDialog extends Activity {
    private static Context context;
    private static Dialog dialog;
    public static void dialog(final Context ctxt, final String calledBy,
                              String title, String message, String buttonText) {
        context = ctxt;
        if( dialog != null && dialog.isShowing() ) return;
        dialog = new Dialog(context);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.getWindow().setBackgroundDrawableResource(R.color.transparent);
        dialog.setCancelable(false);
        dialog.setCanceledOnTouchOutside(false);
        dialog.setContentView(R.layout.custom_dialog_single_button);
        TextView txtTitle = dialog.findViewById(R.id.txtTitle);
        TextView txtMessage = dialog.findViewById(R.id.txtMessage);
        TextView tvOK = dialog.findViewById(R.id.tvOK);
        txtTitle.setText(title);
        txtMessage.setText(message);
        tvOK.setText(buttonText);

        dialog.show();
    }

并像这样称呼它

CustomDialogSingleButton.dialog(context,
                        Constants.SYNC_FILES
                        , context.getResources().getString(R.string.sync_files_title),
                        context.getResources().getString(R.string.sync_files_msg), "OK");

只需尝试此代码，您的对话框就会出现

Answer 3

对话框片段的代码

public class MyCustomDialog extends DialogFragment{
 @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setStyle(android.app.DialogFragment.STYLE_NORMAL, android.R.style.Theme_Black_NoTitleBar);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.dialog_view, container, false);
return v;
}
}

并从您的活动中调用此 MyCustomDialog，如下所示，

 MyCustomDialog dialog = new MyCustomDialog();
 Bundle args = new Bundle();
 FragmentTransaction ft = getFragmentManager().beginTransaction();
 dialog.show(ft, MyCustomDialog.TAG);

Answer 4

自定义视图

<!-- fragment_edit_name.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/edit_name"
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:layout_gravity="center" android:orientation="vertical"  >
    <TextView
        android:id="@+id/lbl_your_name" android:text="Your name" 
        android:layout_width="wrap_content" android:layout_height="wrap_content" />
    <EditText
        android:id="@+id/txt_your_name"
        android:layout_width="match_parent"  android:layout_height="wrap_content" 
        android:inputType="text"
        android:imeOptions="actionDone" />
</LinearLayout>

并定义从对话片段的支持版本扩展的片段本身：

import android.support.v4.app.DialogFragment;
// ...
public class EditNameDialogFragment extends DialogFragment {
    private EditText mEditText;
    public EditNameDialogFragment() {
        // Empty constructor is required for DialogFragment
                // Make sure not to add arguments to the constructor
                // Use `newInstance` instead as shown below
    }
    public static EditNameDialogFragment newInstance(String title) {
        EditNameDialogFragment frag = new EditNameDialogFragment();
        Bundle args = new Bundle();
        args.putString("title", title);
        frag.setArguments(args);
        return frag;
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_edit_name, container);
    }
    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        // Get field from view
        mEditText = (EditText) view.findViewById(R.id.txt_your_name);
        // Fetch arguments from bundle and set title
        String title = getArguments().getString("title", "Enter Name");
        getDialog().setTitle(title);
        // Show soft keyboard automatically and request focus to field
        mEditText.requestFocus();
        getDialog().getWindow().setSoftInputMode(
            WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
    }
}

并在扩展 AppCompatActivity 的活动中显示对话框：

从 FAB 的点击方法调用showEditDialog()方法

private void showEditDialog() {
      FragmentManager fm = getSupportFragmentManager();
      EditNameDialogFragment editNameDialogFragment = EditNameDialogFragment.newInstance("Some Title");
      editNameDialogFragment.show(fm, "fragment_edit_name");
  }

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