我正在尝试在我的 fragment 中显示自定义 toast。我的代码如下
public void showToastFav(){
LayoutInflater inflater = getLayoutInflater();
View layout = inflater.inflate(R.layout.correct_toast,
(ViewGroup) view.findViewById(R.id.toast_layout_root));
ImageView ToastIconNew = (ImageView) layout.findViewById(R.id.ToastIcon);
TextView text = (TextView) layout.findViewById(R.id.text);
text.setText("Helo");
//ToastIconNew.setImageDrawable(ToastIcon);
Toast toast = new Toast(getActivity());
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(layout);
toast.show();
}
我在 onClick 我的按钮上调用此函数，但出现错误
java.lang.NullPointerException: Attempt to invoke virtual method
android.view.View android.view.View.findViewById(int)
on a null object reference
我在onCreateView之外添加了上述函数。
我的 XML 如下所示
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/toast_layout_root"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp"
android:background="?attr/colorPrimaryDark">
<ImageView
android:id="@+id/ToastIcon"
android:layout_width="@dimen/nav_but_size"
android:layout_height="@dimen/nav_but_size"
android:src="@drawable/ic_like"
android:layout_gravity="center_horizontal|center_vertical"
android:tint="?attr/TextColor" />
<TextView
android:layout_marginLeft="15dp"
android:layout_marginStart="15dp"
android:background="?attr/List_Text"
android:layout_width="2dp"
android:layout_height="match_parent" />
<TextView
android:id="@+id/text"
android:textStyle="bold"
android:layout_marginLeft="15dp"
android:layout_marginStart="15dp"
android:textSize="@dimen/newMainText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="start"
android:text="two\n newlike "
android:textColor="?attr/TextColor" />
</LinearLayout>
我的完整 fragment 代码如下。
public class QuoteFragment extends Fragment implements View.OnClickListener{
int fragVal;
String text;
View view;
RelativeLayout image,message,whatsapp,facebook,insta;
public static QuoteFragment init(int val,String text) {
QuoteFragment truitonFrag = new QuoteFragment();
// Supply val input as an argument.
Bundle args = new Bundle();
args.putInt("val", val);
args.putString("text",text);
truitonFrag.setArguments(args);
return truitonFrag;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
fragVal = getArguments() != null ? getArguments().getInt("val") : 1;
text = getArguments() != null ? getArguments().getString("text") : "";
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.quote_fragment_layout, container, false);
image = (RelativeLayout) view.findViewById(R.id.image);
image.setOnClickListener(this);
whatsapp = (RelativeLayout) view.findViewById(R.id.whatsapp);
whatsapp.setOnClickListener(this);
insta = (RelativeLayout) view.findViewById(R.id.insta);
insta.setOnClickListener(this);
facebook = (RelativeLayout) view.findViewById(R.id.facebook);
facebook.setOnClickListener(this);
message = (RelativeLayout) view.findViewById(R.id.message);
message.setOnClickListener(this);
Typeface font = Typeface.createFromAsset(getActivity().getAssets(), constant.font);
final TextView mQuoteText = (TextView) view.findViewById(R.id.textDetailQuote);
mQuoteText.setTypeface(font,Typeface.BOLD);
try {
mQuoteText.setText(text);
} catch (Exception e) {
mQuoteText.setText("Hello !!");
}
return view;
}
public void showToastFav(){
LayoutInflater inflater = getLayoutInflater();
View layout = inflater.inflate(R.layout.correct_toast,
(ViewGroup).findViewById(R.id.toast_layout_root));
ImageView ToastIconNew = (ImageView) layout.findViewById(R.id.ToastIcon);
TextView text = (TextView) layout.findViewById(R.id.text);
text.setText("Helo");
//ToastIconNew.setImageDrawable(ToastIcon);
Toast toast = new Toast(getActivity());
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(layout);
toast.show();
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.image:
Intent i = new Intent(getActivity(), NameArt.class);
i.putExtra("quotetext", text);
startActivity(i);
break;
case R.id.whatsapp:
try{
Intent fbIntent = new Intent(Intent.ACTION_SEND);
fbIntent.putExtra(Intent.EXTRA_TEXT, text);
fbIntent.setType("text/plain");
fbIntent.setPackage("com.whatsapp");
fbIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
startActivity(fbIntent);
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(getActivity(), "Something Wrong", Toast.LENGTH_SHORT).show();
}
break;
case R.id.facebook:
try{
Intent fbIntent = new Intent(Intent.ACTION_SEND);
fbIntent.putExtra(Intent.EXTRA_TEXT, text);
fbIntent.setType("text/plain");
fbIntent.setPackage("com.facebook.orca");
fbIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
startActivity(fbIntent);
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(getActivity(), "Please Install Facebook Messenger", Toast.LENGTH_SHORT).show();
}
break;
case R.id.insta:
Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts("mailto", "", null));
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Best Hindi Status");
emailIntent.putExtra(Intent.EXTRA_TEXT, text);
startActivity(Intent.createChooser(emailIntent, "Send email..."));
break;
case R.id.message:
//String myText=currentQuote.getQuText();
android.content.ClipboardManager clipboard = (android.content.ClipboardManager) getActivity().getSystemService(Context.CLIPBOARD_SERVICE);
android.content.ClipData clip = android.content.ClipData.newPlainText("Copied Text",text );
clipboard.setPrimaryClip(clip);
Toast.makeText(getActivity(),text,Toast.LENGTH_SHORT).show();
showToastFav();
break;
default:
break;
}
}
}
我试图在过去两个小时内找到解决方案，但没有找到任何解决方案。让我知道我做错了什么。谢谢
最佳答案
正如错误消息告诉您的那样，R.id.toast_layout_root、R.id.ToastIcon 或您的 R.id.text变量为 null，因此不允许使用 null 值进行函数调用。
请调试您的代码并查看哪个变量为 null。
您还可以查看文档并了解具体错误消息的实际含义。
关于java - fragment 函数中的 NullPointerException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46264292/