我是Android Studio的新手,我正在尝试使用一个活动和一个片段构建一个简单的界面。但是,当我运行应用程序时,它说“错误膨胀类片段”这是我的代码:
activity_main.xml中:
<?xml version="1.0" encoding="utf-8"?>
<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:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<include layout="@layout/content_main" />
</android.support.design.widget.CoordinatorLayout>
MainActivity.java:
package com.example.zhuol.sunshine;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@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);
}
}
content_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/activity_main" tools:context=".MainActivity"
android:orientation="vertical">
<fragment
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:name="com.example.zhuol.sunshine.Fragment_Item"
android:id="@+id/fragment"
android:layout_gravity="center_horizontal|bottom" />
</FrameLayout>
fragment_fragment_item.xml:
<FrameLayout 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" tools:context="com.example.zhuol.sunshine.Fragment_Item">
<!-- TODO: Update blank fragment layout -->
<TextView android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/hello_blank_fragment" />
</FrameLayout>
主要错误:
11-12 00:47:42.179 10787-10787/com.example.zhuol.sunshine E/AndroidRuntime:
FATAL EXCEPTION: main
11-12 00:47:42.179 10787-10787/com.example.zhuol.sunshine E/AndroidRuntime:
Process: com.example.zhuol.sunshine, PID: 10787
11-12 00:47:42.179 10787-10787/com.example.zhuol.sunshine E/AndroidRuntime:
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.example.zhuol.sunshine/com.example.zhuol.sunshine.MainActivity}: android.view.InflateException: Binary XML file line #17: Error inflating class fragment
E/AndroidRuntime: Caused by: android.view.InflateException: Binary XML file line #17: Error inflating class fragment
E/AndroidRuntime: Caused by: java.lang.ClassCastException: com.example.zhuol.sunshine.MainActivity@101ed69b must implement OnFragmentInteractionListener
答案 0 :(得分:1)
以下是问题的根源:
com.example.zhuol.sunshine.MainActivity@101ed69b must implement OnFragmentInteractionListener
您应该在OnFragmentInteractionListener
MainActivity
因此,如果您的com.example.zhuol.sunshine.Fragment_Item
使用OnFragmentInteractionListener
定义了onFragmentInteractionHome
界面,openHome
方法
public class Fragment_Item extends Fragment {
private OnFragmentInteractionListener mListener;
.
.
public interface OnFragmentInteractionListener {
public void onFragmentInteractionHome(Uri uri);
public void openHome(View view);
}
}
然后,您应该在MainActivity中实施OnFragmentInteractionListener
并实施onFragmentInteractionHome
,openHome
方法
public class MainActivity extends Activity implements HomeFragment.OnFragmentInteractionListener {
.
.
.
@Override
public void openHome(View view) {
System.out.println("Success");
}
@Override
public void onFragmentInteractionHome(Uri uri) {
Toast.makeText(this, "Success", Toast.LENGTH_SHORT).show();
}
}