问题
I want to develop the UI in which user will touch the touch pad and if he is registered user of the system , he will be verified by my app. So to indicate that I want to change the fingerprint image by green (valid user) , red (invalid user). So I have created the fragment in which I am getting that result in following two methods
@Override
public void authenticate() {
Log.d(TAG, "authoticate: ");
result = "Yes";
//customBuilder.setImage(R.drawable.ic_fingerprint_pressed);//tried but not working
}
@Override
public void errorAuthenticate() {
Log.d(TAG, "fail: ");
result = "No";
// customBuilder.setImage(R.drawable.ic_fingerprint_pressed_error);//tried but not working
}
Now in same fragment I have created the CustomDialog to show the above images which will be change dynamically. Code for CustomDialog class is given below
public class CustomDialog extends AlertDialog {
public CustomDialog(Context context, int theme) {
super(context, theme);
}
public CustomDialog(Context context) {
super(context);
}
/**
* Helper class for creating a custom dialog
*/
public static class Builder {
private Context context;
private String title;
private int res;
private String message;
private String positiveButtonText;
private String negativeButtonText;
private View contentView;
private DialogInterface.OnClickListener
positiveButtonClickListener,
negativeButtonClickListener;
public Builder(Context context) {
this.context = context;
}
public Builder setMessage(String message) {
this.message = message;
return this;
}
public Builder setMessage(int message) {
this.message = (String) context.getText(message);
return this;
}
/**
* Set the Dialog title from resource
* @param title
* @return
*/
public Builder setTitle(int title) {
this.title = (String) context.getText(title);
return this;
}
/**
* Set the Dialog title from String
* @param title
* @return
*/
public Builder setTitle(String title) {
this.title = title;
return this;
}
public Builder setImage(int res){
this.res = res;
return this;
}
/**
* Set a custom content view for the Dialog.
* If a message is set, the contentView is not
* added to the Dialog...
* @param v
* @return
*/
public Builder setContentView(View v) {
this.contentView = v;
return this;
}
/**
* Set the positive button resource and it's listener
* @param positiveButtonText
* @param listener
* @return
*/
public Builder setPositiveButton(int positiveButtonText,
DialogInterface.OnClickListener listener) {
this.positiveButtonText = (String) context
.getText(positiveButtonText);
this.positiveButtonClickListener = listener;
return this;
}
/**
* Set the positive button text and it's listener
* @param positiveButtonText
* @param listener
* @return
*/
public Builder setPositiveButton(String positiveButtonText,
DialogInterface.OnClickListener listener) {
this.positiveButtonText = positiveButtonText;
this.positiveButtonClickListener = listener;
return this;
}
/**
* Set the negative button resource and it's listener
* @param negativeButtonText
* @param listener
* @return
*/
public Builder setNegativeButton(int negativeButtonText,
DialogInterface.OnClickListener listener) {
this.negativeButtonText = (String) context
.getText(negativeButtonText);
this.negativeButtonClickListener = listener;
return this;
}
/**
* Set the negative button text and it's listener
* @param negativeButtonText
* @param listener
* @return
*/
public Builder setNegativeButton(String negativeButtonText,
DialogInterface.OnClickListener listener) {
this.negativeButtonText = negativeButtonText;
this.negativeButtonClickListener = listener;
return this;
}
/**
* Create the custom dialog
*/
public CustomDialog create() {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// instantiate the dialog with the custom Theme
final CustomDialog dialog = new CustomDialog(context,
R.style.Dialog);
View layout = inflater.inflate(R.layout.capture_finger_touch, null);
// dialog.addContentView(layout, new ViewGroup.LayoutParams(
// ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
// set the dialog title
((ImageView) layout.findViewById(R.id.imgView)).setImageResource(res);
// set the confirm button
if (positiveButtonText != null) {
((Button) layout.findViewById(R.id.btn))
.setText(positiveButtonText);
if (positiveButtonClickListener != null) {
((Button) layout.findViewById(R.id.btn))
.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
positiveButtonClickListener.onClick(
dialog,
DialogInterface.BUTTON_POSITIVE);
}
});
}
} else {
// if no confirm button just set the visibility to GONE
layout.findViewById(R.id.btn).setVisibility(
View.GONE);
}
dialog.setView(layout);
return dialog;
}
}
}
And I have used above CustomDialog by following way
public static String result = "No Found";
CustomDialog.Builder customBuilder = new CustomDialog.Builder(getActivity());
public void captureFingerPrintTouchCustom() {
if (result.equalsIgnoreCase("Yes")) {
customBuilder.setImage(R.drawable.ic_fingerprint_pressed);
} else if (result.equalsIgnoreCase("No")) {
customBuilder.setImage(R.drawable.ic_fingerprint_pressed_error);
//rl.startAnimation(animation);
} else customBuilder.setImage(R.drawable.ic_fingerprint_for_capture);
customBuilder.setPositiveButton("OK2", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog = customBuilder.create();
alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
alertDialog.setCanceledOnTouchOutside(false);
alertDialog.setCancelable(false);
alertDialog.show();
}
Here as per the result value I want to change the image of customdialog.
capture_finger_touch.xml code is given below
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:id="@+id/rl"
android:layout_width="@dimen/alert_dialog_size"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="@drawable/rounded_white_background"
android:padding="@dimen/view_internal_space">
<ImageView
android:id="@+id/imgView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="@drawable/key_bg_square"
android:src="@drawable/ic_fingerprint_for_capture" />
<Button
android:id="@+id/btn"
style="@style/button_style"
android:layout_height="@dimen/btnHeight"
android:layout_width="wrap_content"
android:layout_below="@+id/imgView"
android:layout_centerHorizontal="true"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:textColor="@color/white"
android:textSize="@dimen/BTC_title_size"
android:textStyle="bold" />
</RelativeLayout>
</RelativeLayout>
But problem is that its not changing the image dynamically. CustomDialog is created like this,
回答1:
I would suggest you to extend DialogFragment.class, inflate there you layout and communicate with it in you Activity or Fragment
public class FingerprintDialog extends AppCompatDialogFragment implements View.OnClickListener {
private DialogFingerprintBinding binding;
private Listener listener;
@Override
public void onAttach(Context context) {
super.onAttach(context);
try {
listener = (Listener) context;
} catch (ClassCastException e) {
throw new ClassCastException(context.toString() + " implement Listener");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//if you use databinding
//binding = DataBindingUtil.inflate(LayoutInflater.from(getContext()), R.layout.XXX, null, false);
//binding.buttonCancel.setOnClickListener(this);
View view = inflater.inflate(R.layout.XXX, container, false);
Button button = view.findViewById(R.id.button);
getDialog().setCanceledOnTouchOutside(false);
if (getDialog().getWindow() != null) {
getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);
getDialog().getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
}
//return binding.getRoot(); for binding
return view;
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button:
listener.cancel();
break;
default:
break;
}
}
public void changeImage(//posible resource) {
//change Image here
}
public interface Listener {
void cancel();
}
}
And then create instance of this dialog nad show it using method DialogFragment#show
回答2:
You need to setImageResource to ImageView as follows:
private fingerPrintImageView;
public CustomDialog create() {fingerPrintImageView = ((ImageView) layout.findViewById(R.id.imgView)).setImageResource(res);}
public Builder setImage(int res){this.res = res;fingerPrintImageView.setImageResource(res); return this;}
来源：https://stackoverflow.com/questions/50042110/change-imageview-of-alertdialog-as-per-the-result