Snackbar InflateException

Question

我一直在挣扎，因为工作室抱怨Dialog被弃用了，所以我又去看了一遍文档，似乎Toast也被弃用了。所以我试着从Toast迁移到Snackbar，但现在失败了…我补充说

implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:design:28.0.0'

添加到我的gradle依赖项中，以便从文档中访问所需的类。

我用CoordinatorLayout包装了原始的LinearLayout，并将我的主布局改为

<android.support.design.widget.CoordinatorLayout
  android:id="@+id/myCoordinatorLayout"
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <FrameLayout
      android:layout_height="match_parent"
      android:layout_width="match_parent"
      android:orientation="vertical"
      android:id="@+id/shellView"
      android:padding="10dp">
   </FrameLayout>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>

然后，在MainActivity的onCreate中检索对该CoordinatorLayout的引用

 coordinatorView = findViewById(R.id.myCoordinatorLayout);

稍后在onOptionsItemSelected中，在我正在调试的一个菜单点中：

Snackbar mySnackbar = Snackbar.make(coordinatorView, "Launched import", Snackbar.LENGTH_LONG);
mySnackbar.show();

一旦输入这两行代码，应用程序就会崩溃：

android.view.InflateException: Binary XML file line #41: Binary XML file line #41: Error         inflating class android.widget.Button
    Caused by: android.view.InflateException: Binary XML file line #41: Error inflating class     android.widget.Button
    Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Constructor.newInstance0(Native Method)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
        at android.view.LayoutInflater.createView(LayoutInflater.java:647)
        at         com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58)
        at android.view.LayoutInflater.onCreateView(LayoutInflater.java:720)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:788)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
        at android.support.design.widget.Snackbar.make(Snackbar.java:188)
        at com.nohkumado.nohfibu.MainActivity.onOptionsItemSelected(MainActivity.java:187)
        at android.app.Activity.onMenuItemSelected(Activity.java:3450)

如上所示，它没有按钮？？centerview (外壳视图)由一个显示实际功能的可切换片段填充，它以一个简单的TextView+EditView启动，所以启动片段不能也是罪魁祸首，那里没有按钮...

所以欢迎任何关于如何解决这个问题的想法！

按照要求，我添加了整个onOptionsItemSelected

@Override
public boolean onOptionsItemSelected(MenuItem item)
{
FragmentManager fm = getFragmentManager();
Log.d(TAG,"got item clicked "+item.getItemId());

switch (item.getItemId())
    {
  case R.id.menuLsbook:
    Log.d(TAG,"starting up ls book frag");
    LsBookFragment lbook = new LsBookFragment().shell(shell);
    lbook.show(fm, getResources().getString(R.string.mlsbook));
    Log.d(TAG,"ls book running");
    break;
  case R.id.menuShowKpl:
    Log.d(TAG,"starting up kpl frag");

    EditorFrag editorFrag = (EditorFrag) fm.findFragmentByTag(KPLFRAG);
      if(editorFrag == null)
      {
        editorFrag = new EditKplFrag().shell(shell);
      }
      fm.beginTransaction().replace(R.id.shellView,editorFrag,KPLFRAG).commit();
    Log.d(TAG,"kpl running");
    break;
        case R.id.menuShowJrl:
            Log.d(TAG,"starting up jrl frag");

            editorFrag = (EditorFrag) fm.findFragmentByTag(JRLFRAG);
            if(editorFrag == null)
            {
                editorFrag = new EditJrlFrag().shell(shell);
            }
            fm.beginTransaction().replace(R.id.shellView,editorFrag,JRLFRAG).commit();
            Log.d(TAG,"jrl running");
            break;
  case R.id.menu_import:
    Log.d(TAG,"selecting a source for importation of a new book book frag");
    ImportBookFragment ibook = new ImportBookFragment().shell(shell);
    //ibook.show(fm, getResources().getString(R.string.mlsbook));
    Log.d(TAG,"import book running");
    Snackbar mySnackbar = Snackbar.make(coordinatorView, "Launched import", Snackbar.LENGTH_LONG);
    mySnackbar.show();

    break;

  case R.id.menu_show_shell:
    Log.d(TAG,"starting shell frag");
    ShellFragment shellfrag = (ShellFragment) fm.findFragmentByTag(SHELLFRAG);
    if (shellfrag == null)
    {
      //Log.d(TAG, "no shell frag");
      shellfrag = new ShellFragment();
      shellfrag.callback(this);
      fm.beginTransaction().add(R.id.shellView, shellfrag, SHELLFRAG).commit();
      //Log.d(TAG, "shellfrag added");
      if(shell != null) shellfrag.shell(shell);
    }//if (shellfrag == null)
    shell = shellfrag.shell();
    Log.d(TAG,"shell displaying");
    break;


  case R.id.menu_settings:
            Log.d(TAG, "case is settings, creating intent");
            //Intent intent = new Intent();
            //intent.setClassName(this, "com.nohkumado.nohfibu.SettingsActivity");
            Intent intent = new Intent(this, SettingsActivity.class);
            startActivity(intent);
            //startActivityForResult(i, RESULT_SETTINGS);
            Log.d(TAG, "fired intent");
            break;
        case R.id.mabout:
            AboutDialogFragment about = new AboutDialogFragment();
            about.setVersion(new VersionCommand(shell).execute());
            about.show(fm, getResources().getString(R.string.mabout));
            break;
  case R.id.menu_manual:
    about = new AboutDialogFragment();
    about.setVersion(new VersionCommand(shell).execute());
    about.show(fm, getResources().getString(R.string.empty));
    break;
    }

    return true;
}

Answer 1

二进制XML文件第41行:膨胀类时出错

android.widget.Button

它来自Button类。然而，，

添加：

implementation 'com.android.support:appcompat-v7:28.0.0'

添加到您的build.gradle依赖项中，然后尝试。

您不需要：

implementation 'com.android.support:coordinatorlayout:28.0.0-alpha1'

更新：检查您添加的代码后，似乎您实际上是在尝试使用Fragment id在LinearLayout中显示shellView s。将其更改为FrameLayout，然后我希望它应该可以工作。