Alertdialog.Builder setview：调用需要 API 级别 21

Question

我试图在扩展 DialogPreference 的 class 中获得一个半径 NumberPicker 运行，但我在让 setView() 工作时遇到了很多麻烦。让我们从一些代码开始：

public class RadiusPickerPreference extends DialogPreference{
    public RadiusPickerPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    @Override
    protected void onPrepareDialogBuilder(android.app.AlertDialog.Builder builder) {
        builder.setTitle(R.string.set_radius_dialog_fragment_title);
        builder.setView(R.layout.dialog_radius_picker);
        builder.setPositiveButton(android.R.string.ok, null);
        builder.setNegativeButton(android.R.string.cancel, null);
    }
}

这让我在 builder.setView 上出现错误，说 "Call requires API 21 (current min is 15)." 我想支持 APIs 15+ 的设备，因此无法更改此选项。现在，如果我尝试覆盖

protected void onPrepareDialogBuilder(android.support.v7.app.AlertDialog.Builder builder)

而是 "Method does not override method from its superclass."

问题是，如何设置视图？不一定非要在onPrepareDialogBuilder()中，只要支持API15+即可。谢谢！

PS：如果您需要更多代码，请告诉我。要使其显示在 XML 中，只需将其添加到 <PreferenceScreen>:

<com.example.project.RadiusPickerPreference
    android:id="@+id/radPickerPref"
    android:key="@string/pref_key_default_radius"
    android:title="@string/pref_title_default_radius"/>

Answer 1

我在尝试自定义警报对话框时有过一些不太有趣的经历，建议您在确实需要详细的弹出窗口时绕过这个想法。如果您想改为尝试该路线，这里有一些对话片段代码...

public class AboutUs extends DialogFragment {



public interface DialogListener {
    void onDialogFinish();
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_about_us, container,
            false);
    getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);

    Display display = getActivity().getWindowManager().getDefaultDisplay();
    Point size = new Point(); display.getSize(size);
    int width=size.x; int height=size.y;  //change these to make your dialog the size you wish

    WindowManager.LayoutParams wmlp = getDialog().getWindow().getAttributes();
    wmlp.height=height; wmlp.width=width;

    getDialog().getWindow().setAttributes(wmlp);
    WindowManager.LayoutParams lp = getDialog().getWindow().getAttributes();
    lp.dimAmount=0.4f;
    getDialog().getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
    getDialog().setCanceledOnTouchOutside(true);



    return rootView;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setStyle(DialogFragment.STYLE_NO_FRAME, android.support.v7.appcompat.R.style.Theme_AppCompat_Light);

}


public AboutUs()
{
}


}




\to call fragment from activity

AboutUs aboutUs = new AboutUs();
aboutUs.show(getSupportFragmentManager(), "Dialog Fragment");

Answer 2

您在这里要做的是调用 API 21 中添加的函数，而不是 API 1 中添加的函数。根据 the documentation, you want setView(View view) instead of setView(int layoutResId). To get a View from a layout, you need a LayoutInflater. To get an instance of LayoutInflater, you will need a context object. When you create your dialog, I would recommend storing your Context as a variable in the class for future use. Then, in onPrepareDialogBuilder, you can use (as per the docs):

LayoutInflater inflater = (LayoutInflater)context.getSystemService (Context.LAYOUT_INFLATER_SERVICE)

现在，您可以使用 inflater 从布局中获取 View 并按如下方式设置对话框的 View：

 View v = inflater.inflate(R.layout.dialog_radius_picker, null);

因此，您的代码可能如下所示：

@Override
protected void onPrepareDialogBuilder(android.app.AlertDialog.Builder builder) {
    LayoutInflater inflater = (LayoutInflater)context.getSystemService (Context.LAYOUT_INFLATER_SERVICE);
    builder.setTitle(R.string.set_radius_dialog_fragment_title);
    View v = inflater.inflate(R.layout.dialog_radius_picker, null);
    builder.setView(v);
    builder.setPositiveButton(android.R.string.ok, null);
    builder.setNegativeButton(android.R.string.cancel, null);
}

希望对您有所帮助！

Answer 3

无需调用 setView(int resourceId)，这需要 API21+，只需创建一个 View 对象，扩充资源并调用 setView(View view) 传递此视图。

Alertdialog.Builder setview：调用需要 API 级别 21

Alertdialog.Builder setview: Call requires API level 21

java

android

android-alertdialog

dialog-preference