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以下this示例在這裏，我試圖將映射插入到片段中。這裏是我的片段類：將映射添加到片段會產生異常
package com.example.mapfragdemo;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapPageFragment extends Fragment {
private SupportMapFragment fragment;
private GoogleMap map;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.map_fragment_layout, container, false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
FragmentManager fm = getChildFragmentManager();
fragment = (SupportMapFragment) fm.findFragmentById(R.id.map);
if (fragment == null) {
fragment = SupportMapFragment.newInstance();
fm.beginTransaction().replace(R.id.map, fragment).commit();
}
}
@Override
public void onResume() {
super.onResume();
if (map == null) {
map = fragment.getMap();
map.addMarker(new MarkerOptions().position(new LatLng(0, 0)));
}
}
}
這是我的主要活動：
package com.example.mapfragdemo;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class MainActivity extends Activity {
@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.activity_main, menu);
return true;
}
}
activity_main.xml中
<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"
tools:context=".MainActivity" >
<fragment
android:id="@+id/fragment1"
android:name="com.example.mapfragdemo.MapPageFragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</RelativeLayout>
map_fragment_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:id="@+id/map"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
class="com.google.android.gms.maps.SupportMapFragment"
map:uiCompass="true"
map:mapType= "normal"
map:uiRotateGestures="true"
map:uiScrollGestures="true"
map:uiTiltGestures="true"
map:uiZoomControls="true"
map:uiZoomGestures="true" />
我得到以下例外：
02-10 02:23:40.731: E/Trace(23341): error opening trace file: No such file or directory (2)
02-10 02:23:40.731: D/ActivityThread(23341): setTargetHeapUtilization:0.25
02-10 02:23:40.731: D/ActivityThread(23341): setTargetHeapIdealFree:8388608
02-10 02:23:40.731: D/ActivityThread(23341): setTargetHeapConcurrentStart:2097152
02-10 02:23:40.841: D/AndroidRuntime(23341): Shutting down VM
02-10 02:23:40.841: W/dalvikvm(23341): threadid=1: thread exiting with uncaught exception (group=0x40d65378)
02-10 02:23:40.851: E/AndroidRuntime(23341): FATAL EXCEPTION: main
02-10 02:23:40.851: E/AndroidRuntime(23341): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mapfragdemo/com.example.mapfragdemo.MainActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2071)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2096)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.ActivityThread.access$600(ActivityThread.java:138)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1207)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.os.Handler.dispatchMessage(Handler.java:99)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.os.Looper.loop(Looper.java:213)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.ActivityThread.main(ActivityThread.java:4787)
02-10 02:23:40.851: E/AndroidRuntime(23341): at java.lang.reflect.Method.invokeNative(Native Method)
02-10 02:23:40.851: E/AndroidRuntime(23341): at java.lang.reflect.Method.invoke(Method.java:511)
02-10 02:23:40.851: E/AndroidRuntime(23341): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
02-10 02:23:40.851: E/AndroidRuntime(23341): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
02-10 02:23:40.851: E/AndroidRuntime(23341): at dalvik.system.NativeStart.main(Native Method)
02-10 02:23:40.851: E/AndroidRuntime(23341): Caused by: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
02-10 02:23:40.851: E/AndroidRuntime(23341): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:262)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.Activity.setContentView(Activity.java:1867)
02-10 02:23:40.851: E/AndroidRuntime(23341): at com.example.mapfragdemo.MainActivity.onCreate(MainActivity.java:12)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.Activity.performCreate(Activity.java:5008)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2035)
02-10 02:23:40.851: E/AndroidRuntime(23341): ... 11 more
02-10 02:23:40.851: E/AndroidRuntime(23341): Caused by: java.lang.ClassCastException: com.example.mapfragdemo.MapPageFragment cannot be cast to android.app.Fragment
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.Fragment.instantiate(Fragment.java:577)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.Fragment.instantiate(Fragment.java:552)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.app.Activity.onCreateView(Activity.java:4656)
02-10 02:23:40.851: E/AndroidRuntime(23341): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
02-10 02:23:40.851: E/AndroidRuntime(23341): ... 21 more
爲什麼會發生上述異常。任何幫助表示讚賞。