Question

我在启动应用程序时遇到这三个错误，然后它立即崩溃（我已经在必要时添加了所有引用）：

android.view.InflateException: Binary XML file line #29: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #29: Error inflating class fragment
Caused by: java.lang.IllegalStateException: Fragment com.tifinnearme.priteshpatel.materialdrawer.NavigationFragment did not create a view.

这是Mainactivity.java

package com.tifinnearme.priteshpatel.materialdrawer;

import android.content.Intent;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;


public class MainActivity extends ActionBarActivity {
Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    toolbar=(Toolbar)findViewById(R.id.app_bar);
    setSupportActionBar(toolbar);

    getSupportActionBar().setHomeButtonEnabled(true);
    //Create object for drawer layout

    NavigationFragment navFrag=     (NavigationFragment)getSupportFragmentManager().findFragmentById(R.id.drawer_fragment);
    DrawerLayout drawerLayout=(DrawerLayout)findViewById(R.id.drawer_layout);//Get the object of drawer layout

    navFrag.setUp(R.id.drawer_fragment,drawerLayout,toolbar);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }
    if(id==R.id.navigate)
    {
        startActivity(new Intent(this,Subactivity.class));
    }

    return super.onOptionsItemSelected(item);
}
}

NavigationFragment.java

package com.tifinnearme.priteshpatel.materialdrawer;


import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.Toolbar;
import android.view.View;


/**
* A simple {@link Fragment} subclass.
*/
public class NavigationFragment extends Fragment {

public static final String PREF_FILE_NAME="testprefs";
public static final String KEY_USER_LEARNED_DRAWER="User learned drawer";
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private boolean mUserLearnedDrawer;//indicate whether user has opened drawer first time or not(
private boolean mFromSavedInstanceState;
private View containerView;
public NavigationFragment() {
    // Required empty public constructor
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mUserLearnedDrawer=Boolean.valueOf(readFromPrefs(getActivity(), KEY_USER_LEARNED_DRAWER, "false"));//false indicates user doesn't know about drawer
    if(savedInstanceState!=null){
        mFromSavedInstanceState=true;
    }
}


public void setUp(int drawer_fragment, DrawerLayout drawerLayout, Toolbar toolbar) {
    //Initialize the drawer layout and toggle
    containerView=getActivity().findViewById(drawer_fragment);
    mDrawerLayout=drawerLayout;
    mDrawerToggle=new ActionBarDrawerToggle(getActivity(),mDrawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close){
        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            if(!mUserLearnedDrawer)
            {
                mUserLearnedDrawer=true;
                savedPreferences(getActivity(),KEY_USER_LEARNED_DRAWER,mUserLearnedDrawer+"");
                //Save this value into our Key to indicate that user has seen drawer
            }
            getActivity().invalidateOptionsMenu();//It creates Actionbar again when drawer toggles


        }

        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
            getActivity().invalidateOptionsMenu();
        }
    };
    if(!mUserLearnedDrawer && !mFromSavedInstanceState)
    {
        mDrawerLayout.openDrawer(containerView);
    }
    mDrawerLayout.setDrawerListener(mDrawerToggle);
}
public static void savedPreferences(Context context,String prefName,String prefValue){
    SharedPreferences sharedPrefs=context.getSharedPreferences(PREF_FILE_NAME,Context.MODE_PRIVATE);
    SharedPreferences.Editor editor=sharedPrefs.edit();
    editor.putString(prefName,prefValue);
    /*editor.commit();*///It wait for the operation to become successful
    editor.apply();//It doesn't wait for the operation to become successful
}
public static String readFromPrefs(Context context,String prefName,String prefDefaultValue){
    SharedPreferences getPrefs=context.getSharedPreferences(PREF_FILE_NAME,Context.MODE_PRIVATE);
    return  getPrefs.getString(prefName,prefDefaultValue);
}
}

activity_main.xml中

<android.support.v4.widget.DrawerLayout     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:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <include
        android:id="@+id/app_bar"
        layout="@layout/app_bar"></include>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/app_bar"
        android:text="@string/hello_world" />
</RelativeLayout>

<fragment
    android:id="@+id/drawer_fragment"
    android:name="com.tifinnearme.priteshpatel.materialdrawer.NavigationFragment"
    android:layout_width="240dp"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    app:layout="@layout/fragment_navigation"
    tools:layout="@layout/fragment_navigation" />


 </android.support.v4.widget.DrawerLayout>

编辑：重复的问题并没有解决我的问题。我仍然遇到同样的问题。如果有人能帮忙解决这个问题，那就好了。谢谢！

Answer 1

改变你的：

<fragment
android:id="@+id/drawer_fragment"
android:name="com.tifinnearme.priteshpatel.materialdrawer.NavigationFragment"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
app:layout="@layout/fragment_navigation"
tools:layout="@layout/fragment_navigation" />

是：

<FrameLayout
       android:id="@+id/content_frame"
       android:layout_width="match_parent"
       android:layout_height="match_parent" />

然后将您的片段添加到content_frame：

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction
            .replace(R.id.content_frame, new your_fragment)
            .commit();

Android：由于添加了片段，无法对activity_main进行通知

1 个答案: