Java onclick侦听器不';我不能断断续续地工作
我已经在一个按钮上实现了onclicklistener,当我在应用程序中单击按钮时,什么都不会发生 代码Java onclick侦听器不';我不能断断续续地工作,java,android-studio,onclicklistener,android-button,Java,Android Studio,Onclicklistener,Android Button,我已经在一个按钮上实现了onclicklistener,当我在应用程序中单击按钮时,什么都不会发生 代码 它也不会显示Toast消息,而不是返回充气机。充气(R.layout.fragment\u statusfragment,container,false) do返回视图代替返回充气机。充气(R.layout.fragment\u status fragment,container,false) do返回视图您已经在初始化充气机。充气(R.layout.fragment\u statusfra
它也不会显示Toast消息,而不是返回充气机。充气(R.layout.fragment\u statusfragment,container,false)代码>
do
返回视图代码>代替返回充气机。充气(R.layout.fragment\u status fragment,container,false)代码>
do返回视图代码>您已经在初始化充气机。充气(R.layout.fragment\u statusfragment,container,false)代码>开始时,将其分配给视图
,因此只需返回视图代码>结束。您已经在初始化充气机。充气(R.layout.fragment\u statusfragment,container,false)代码>开始时,将其分配给视图
,因此只需返回视图代码>结束。首先尝试在片段的方法的onViewCreated()
中完成所有UI工作
在这里,您不会返回上面最后一段中初始化的视图
,而是使用按钮
变量来实现click listener
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_statusfragment,container,false);
imageView = view.findViewById(R.id.imageView);
button = (Button)view.findViewById(R.id.button2);
textView = view.findViewById(R.id.textView);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getActivity(),"Upload screenshot",Toast.LENGTH_LONG).show();
if(ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED){
requestPermissions(
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
2000);
}else {
Toast.makeText(getActivity(), "Choose Screenshot", Toast.LENGTH_LONG).show();
imageView.setVisibility(View.VISIBLE);
button.setVisibility(View.VISIBLE);
textView.setVisibility(View.VISIBLE);
Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
if (intent.resolveActivity(getActivity().getPackageManager()) != null) {
startActivityForResult(intent,1000);
}
}
}
});
// Inflate the layout for this fragment
return view;
}
首先尝试在Fragment
的onViewCreated()
方法中完成所有UI工作
在这里,您不会返回上面最后一段中初始化的视图
,而是使用按钮
变量来实现click listener
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_statusfragment,container,false);
imageView = view.findViewById(R.id.imageView);
button = (Button)view.findViewById(R.id.button2);
textView = view.findViewById(R.id.textView);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getActivity(),"Upload screenshot",Toast.LENGTH_LONG).show();
if(ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED){
requestPermissions(
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
2000);
}else {
Toast.makeText(getActivity(), "Choose Screenshot", Toast.LENGTH_LONG).show();
imageView.setVisibility(View.VISIBLE);
button.setVisibility(View.VISIBLE);
textView.setVisibility(View.VISIBLE);
Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
if (intent.resolveActivity(getActivity().getPackageManager()) != null) {
startActivityForResult(intent,1000);
}
}
}
});
// Inflate the layout for this fragment
return view;
}