安卓 java。lang.IllegalArgumentException:在给定视图中找不到合适的父级。请提供有效的视图

3 月，2 周 Questions & Answers 27808

我的应用程序在试图显示服务器消息时崩溃，我认为问题可能出在我的getView()。下面是崩溃发生时的registerActivity和我的activity_register.xml

import 安卓.app.Activity;
import 安卓.app.ProgressDialog;
import 安卓.content.Intent;
import 安卓.os.Bundle;
import 安卓.support.design.widget.Snackbar;
import 安卓.util.Log;
import 安卓.view.View;
import 安卓.widget.Button;
import 安卓.widget.EditText;
import 安卓.widget.ProgressBar;
import 安卓.widget.Toast;

import com.fastchat.helper.SQLiteHandler;
import com.fastchat.helper.SessionManager;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;


public class RegisterActivity extends Activity {

private static final String TAG = RegisterActivity.class.getSimpleName();
private Button btnRegister;
private Button btnLinkToLogin;
private EditText inputFullName;
private EditText inputEmail;
private EditText inputPassword;
private ProgressDialog pDialog;
private SessionManager session;
private SQLiteHandler db;
private ProgressBar progress;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_register);


    inputFullName = (EditText) findViewById(R.id.name);
    inputEmail = (EditText) findViewById(R.id.email);
    inputPassword = (EditText) findViewById(R.id.password);
    btnRegister = (Button) findViewById(R.id.btnRegister);
    btnLinkToLogin = (Button) findViewById(R.id.btnLinkToLoginScreen);

    // Progress dialog
    pDialog = new ProgressDialog(this);
    pDialog.setCancelable(true);

    /*
    // Session manager
    session = new SessionManager(getApplicationContext());

    // SQLite database handler
    db = new SQLiteHandler(getApplicationContext());

    // Check if user is already logged in or not
   if (session.isLoggedIn()) {
        // User is already logged in. Take him to main activity
        Intent intent = new Intent(RegisterActivity.this,
                SearchableActivity.class);
        startActivity(intent);
        finish();

    }
*/
    // Register Button Click event
    btnRegister.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            String name = inputFullName.getText().toString();
            String email = inputEmail.getText().toString();
            String password = inputPassword.getText().toString();

            if (!name.isEmpty() && !email.isEmpty() && !password.isEmpty()) {
                registerProcess(name, email, password);
            } else {
                Toast.makeText(getApplicationContext(),
                        "Please enter your details!", Toast.LENGTH_LONG)
                        .show();
            }
        }
    });

    // Link to Login Screen
    btnLinkToLogin.setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {
            Intent i = new Intent(getApplicationContext(),
                    LoginActivity.class);
            startActivity(i);
            finish();
        }
    });

}   

 private void registerProcess(String name,String email,String password){

    String tag_string_req = "req_register";
    //pDialog = new AlertDialog.Builder(getActivity());
    pDialog.setMessage("please wait");
    pDialog.show();


    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(Constants.BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .build();

    RequestInterface requestInterface = retrofit.create(RequestInterface.class);

    User user = new User();
    user.setName(name);
    user.setEmail(email);
    user.setPassword(password);
    ServerRequest request = new ServerRequest();
    request.setOperation(Constants.REGISTER_OPERATION);
    request.setUser(user);
    Call<ServerResponse> response = requestInterface.operation(request);

    response.enqueue(new Callback<ServerResponse>() {
        private View view;

        public View getView() {
            return view;

        }

        @Override
        public void onResponse(Call<ServerResponse> call, retrofit2.Response<ServerResponse> response) {

            ServerResponse resp = response.body();

           if(resp !=null)//tried to check if resp is null but its not

//crash occurs here
            Snackbar.make(getView(),resp.getMessage(), Snackbar.LENGTH_LONG).show();
            pDialog.dismiss();
        }


        @Override
        public void onFailure(Call<ServerResponse> call, Throwable t) {

           // progress.setVisibility(View.INVISIBLE);
            Log.d(Constants.TAG, "failed");
            Toast.makeText(getApplicationContext(), t.getLocalizedMessage(), Toast.LENGTH_LONG).show();
            pDialog.dismiss();


        }
    });
}

activity_register.xml

  <LinearLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
安卓:layout_width="fill_parent"
安卓:layout_height="fill_parent"
xmlns:tools="http://schemas.安卓.com/tools"
安卓:background="@color/bg_register"
安卓:gravity="center"
安卓:orientation="vertical"
安卓:padding="10dp"
安卓:id="@+id/chat">

<LinearLayout
    安卓:layout_width="fill_parent"
    安卓:layout_height="wrap_content"
    安卓:layout_gravity="center"
    安卓:orientation="vertical"
    安卓:paddingLeft="20dp"
    安卓:paddingRight="20dp" >

    <ImageView
        安卓:layout_width="389dp"
        安卓:layout_height="72dp"
        安卓:layout_gravity="center_horizontal"
        安卓:layout_marginBottom="24dp"
        安卓:src="@drawable/logo"
        tools:ignore="ContentDescription" />


    <EditText
        安卓:id="@+id/name"
        安卓:layout_width="fill_parent"
        安卓:layout_height="wrap_content"
        安卓:layout_marginBottom="10dp"
        安卓:background="@color/input_register_bg"
        安卓:hint="@string/hint_name"
        安卓:padding="10dp"
        安卓:singleLine="true"
        安卓:inputType="textCapWords"
        安卓:textColor="@color/input_register"
        安卓:textColorHint="@color/input_register_hint" />

    <EditText
        安卓:id="@+id/email"
        安卓:layout_width="fill_parent"
        安卓:layout_height="wrap_content"
        安卓:layout_marginBottom="10dp"
        安卓:background="@color/input_register_bg"
        安卓:hint="@string/hint_email"
        安卓:inputType="textEmailAddress"
        安卓:padding="10dp"
        安卓:singleLine="true"
        安卓:textColor="@color/input_register"
        安卓:textColorHint="@color/input_register_hint" />

    <EditText
        安卓:id="@+id/password"
        安卓:layout_width="fill_parent"
        安卓:layout_height="wrap_content"
        安卓:layout_marginBottom="10dp"
        安卓:background="@color/input_register_bg"
        安卓:hint="@string/hint_password"
        安卓:inputType="textPassword"
        安卓:padding="10dp"
        安卓:singleLine="true"
        安卓:textColor="@color/input_register"
        安卓:textColorHint="@color/input_register_hint" />

    <!-- Login Button -->

    <Button
        安卓:id="@+id/btnRegister"
        安卓:layout_width="fill_parent"
        安卓:layout_height="wrap_content"
        安卓:layout_marginTop="20dip"
        安卓:background="#ea4c88"
        安卓:text="register"
        安卓:textColor="@color/white" />

    <!-- Link to Login Screen -->

    <Button
        安卓:id="@+id/btnLinkToLoginScreen"
        安卓:layout_width="fill_parent"
        安卓:layout_height="wrap_content"
        安卓:layout_marginTop="40dip"
        安卓:background="@null"
        安卓:text="already a member? login"
        安卓:textAllCaps="false"
        安卓:textColor="@color/white"
        安卓:textSize="15dp" />
</LinearLayout>

下面是logcat消息

 java.lang.IllegalArgumentException: No suitable parent found from the given view. Please provide a valid view.
                                                              at 安卓.support.design.widget.Snackbar.make(Snackbar.java:137)
                                                              at com.chat.RegisterActivity$3.onResponse(RegisterActivity.java:143)
                                                              at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68)
                                                              at 安卓.os.Handler.handleCallback(Handler.java:739)
                                                              at 安卓.os.Handler.dispatchMessage(Handler.java:95)

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共 (6) 个答案

# 1 楼答案

我也有这个问题。。。当然有点不同

PROBLEM: I used MVVM architecture and LiveData observer for showing SnackBar by the following code...This error occurred to me when I was displaying another fragment and returning back again.

 myViewModel.mSnackbar.observe(this, new SnackBarText.SnackbarTextObserver() {
        @Override
        public void onNewMessage(@NotNull YourSnackBarClass msg) {
            // Showing the message on SnackBar
            Snackbar.make(view, msg.getMessage(), Snackbar.LENGTH_LONG).show();
        }
    });

SOLUTION: I remove this observer when fragment paused (Because I used replace() on fragment transaction)

// fragment area
@Override
protected void onPause() {
    super.onPause();
    mSnackbar.removeObservers(owner)
}

# 2 楼答案
我建议你试试findViewById(android.R.id.content)

这就是我的诀窍：
```
Snackbar.make(findViewById(android.R.id.content), resp.getMessage(), Snackbar.LENGTH_LONG).show();
```
android.R.id.content将为您提供视图的根元素（有关该元素的更多信息，请查看Android: What is android.R.id.content used for?）
# 3 楼答案
我找到了一个解决方案，可以帮助其他寻求共同解决方案的人

在加载整个XML文件之前，我试图用Snackbar显示消息时出现了这个错误

在片段中，我尝试在onCreateView();中调用API，并显示Internet connection is off的Snackbar消息，如下所示：
```
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    mBindingObject = DataBindingUtil.inflate(inflater, getLayoutResId(), container, false);

    getData();

    return mBindingObject.getRoot();
}
```
我只是把这个方法放在onViewCreated()
```
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    getData();
}
```
它现在对我有用

奖金：

Always try to use view after its loaded successfully. Each and every position of one line is matters.

多谢各位

# 4 楼答案

使用协调布局将布局包装起来

<android.support.design.widget.CoordinatorLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:id="@+id/chat"
     android:layout_height="match_parent">
     <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:background="@color/bg_register"
          android:gravity="center"
          android:orientation="vertical"
          android:padding="10dp">
               ...
               ...
               ...
    </LinearLayout>
</android.support.design.widget.CoordinatorLayout>

# 5 楼答案

使用KOTLIN

activity?.window?.decorView?.rootView?.snack("Done !!") fun View.snack(str: String) = Snackbar.make(this, str, Snackbar.LENGTH_SHORT).show()

或者如果您在活动中简单地删除activity?.

# 6 楼答案

用这个替换您的视图

getActivity().getCurrentFocus()

但不是在默认片段中

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有 Java 编程相关的问题?

安卓 java。lang.IllegalArgumentException:在给定视图中找不到合适的父级。请提供有效的视图

共 (6) 个答案

# 1 楼答案

# 2 楼答案

# 3 楼答案

# 4 楼答案

# 5 楼答案

使用KOTLIN

# 6 楼答案