问题
I am creating an android application using material design in android studio for pre lollipop devices and i am new to android studio i am creating a tool bar in my project but i am getting an error called " Caused by: android.view.InflateException: You must specifiy a layout in the include tag: " please help me to solve this, This is my activity code:
package sample.lakshman.com.sampleltester;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v7.widget.Toolbar;
public class MainActivity extends ActionBarActivity {
public Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(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;
}
return super.onOptionsItemSelected(item);
}
}
This is my xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include
android:id="@+id/tool_bar"
android:layout="@layout/tool_bar" />
</RelativeLayout>
This is my Toolbar Xml:
<?xml version="1.0" encoding="utf-8"?>
<android.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#E91E63">
</android.widget.Toolbar>
This is my logcat:
03-06 13:09:39.313 17890-17890/sample.lakshman.com.sampleltester E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: sample.lakshman.com.sampleltester, PID: 17890
java.lang.RuntimeException: Unable to start activity ComponentInfo{sample.lakshman.com.sampleltester/sample.lakshman.com.sampleltester.MainActivity}: android.view.InflateException: You must specifiy a layout in the include tag: <include layout="@layout/layoutID" />
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2338)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: You must specifiy a layout in the include tag: <include layout="@layout/layoutID" />
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:787)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:745)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:228)
at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102)
at sample.lakshman.com.sampleltester.MainActivity.onCreate(MainActivity.java:16)
at android.app.Activity.performCreate(Activity.java:5264)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
回答1:
I find answer to my own question. In my tool activity_main xml layout i replaced android:layout="@layout/tool_bar" with layout="@layout/tool_bar" and in tool bar layout android.widget.Toolbar with android.support.v7.widget.Tool bar Check out below my both xml files
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include
android:id="@+id/tool_bar"
android:layout="@layout/tool_bar" />
</RelativeLayout>
Corrected and working xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include
android:id="@+id/tool_bar"
layout="@layout/tool_bar" />
</RelativeLayout>
For refrernce see the answer here
回答2:
layout="@layout/view_toolbar"
instead
android:layout="@layout/view_toolbar
回答3:
In my case I added a layout with the correct attribute (layout="@layout/digits_layout"), but Android Studio kept throwing this annoying exception. I pressed File > Invalidate and restart, Build > Rebuild Project. Also removed <include> tag from XML. Only after that the exception disappeared. So I suppose only rebuild helps to avoid the problem if you already threw out the <include> tag.
So, in a fragment a have a layout like:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
<include
layout="@layout/digits_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
...
</android.support.constraint.ConstraintLayout>
digits_layout also contains included views:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:baselineAligned="false"
android:orientation="horizontal"
>
<include
android:id="@+id/digit_1"
layout="@layout/item_digit"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="25dp"
android:layout_marginLeft="25dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_weight="1"
/>
...
I think that was the reason.
I use Kotlin with Kotlin Android Extensions for importing resources like import kotlinx.android.synthetic.main.fragment_my.*, that simplifies accessing to views (no findViewById() needed). In my project I separated resources (drawables, layouts) by folders. Maybe it matters. Replacing <include> with <merge> as in https://developer.android.com/training/improving-layouts/reusing-layouts didn't help. Also accessing to any view inside this included layout made it null.
来源：https://stackoverflow.com/questions/28894173/how-to-fix-you-must-specifiy-a-layout-in-the-include-tag-include-layout-la