我试图合并两个 android 演示程序，但我做不对。
我试了好几种方法，都想不通。你能帮帮我吗？
这是我的错误信息:
09-20 03:28:25.617: E/AndroidRuntime(20108): FATAL EXCEPTION: main
09-20 03:28:25.617: E/AndroidRuntime(20108): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.navigation/com.example.android.navigation.MainActivity}: android.view.InflateException: Binary XML file line #18: Error inflating class fragment
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.app.ActivityThread.access$600(ActivityThread.java:141)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.os.Handler.dispatchMessage(Handler.java:99)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.os.Looper.loop(Looper.java:137)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.app.ActivityThread.main(ActivityThread.java:5041)
09-20 03:28:25.617: E/AndroidRuntime(20108): at java.lang.reflect.Method.invokeNative(Native Method)
09-20 03:28:25.617: E/AndroidRuntime(20108): at java.lang.reflect.Method.invoke(Method.java:511)
09-20 03:28:25.617: E/AndroidRuntime(20108): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-20 03:28:25.617: E/AndroidRuntime(20108): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-20 03:28:25.617: E/AndroidRuntime(20108): at dalvik.system.NativeStart.main(Native Method)
09-20 03:28:25.617: E/AndroidRuntime(20108): Caused by: android.view.InflateException: Binary XML file line #18: Error inflating class fragment
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
09-20 03:28:25.617: E/AndroidRuntime(20108): at com.example.android.navigation.BasicMapActivity.onCreateView(BasicMapActivity.java:57)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1470)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:925)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1102)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1458)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:551)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1164)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.app.Activity.performStart(Activity.java:5114)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2153)
09-20 03:28:25.617: E/AndroidRuntime(20108): ... 11 more
09-20 03:28:25.617: E/AndroidRuntime(20108): Caused by: java.lang.RuntimeException: API key not found. Check that <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="your API key"/> is in the <application> element of AndroidManifest.xml
09-20 03:28:25.617: E/AndroidRuntime(20108): at maps.ag.bb.a(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at maps.ag.bb.a(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at maps.ag.an.a(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at maps.ag.bi.a(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at maps.ag.bh.a(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at blf.onTransact(SourceFile:107)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.os.Binder.transact(Binder.java:310)
09-20 03:28:25.617: E/AndroidRuntime(20108): at com.google.android.gms.maps.internal.IMapFragmentDelegate$a$a.onCreateView(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at com.google.android.gms.maps.SupportMapFragment$a.onCreateView(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at com.google.android.gms.internal.bh$4.b(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at com.google.android.gms.internal.bh.a(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at com.google.android.gms.internal.bh.onCreateView(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at com.google.android.gms.maps.SupportMapFragment.onCreateView(Unknown Source)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1470)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:898)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1080)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1182)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:280)
09-20 03:28:25.617: E/AndroidRuntime(20108): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
09-20 03:28:25.617: E/AndroidRuntime(20108): ... 23 more
09-20 03:30:16.829: D/dalvikvm(20329): GC_CONCURRENT freed 189K, 3% free 8774K/9016K, paused 1ms+0ms, total 3ms
09-20 03:30:17.005: D/AndroidRuntime(20329): Shutting down VM
09-20 03:30:17.009: W/dalvikvm(20329): threadid=1: thread exiting with uncaught exception (group=0xa617f908)
09-20 03:30:17.025: E/AndroidRuntime(20329): FATAL EXCEPTION: main
09-20 03:30:17.025: E/AndroidRuntime(20329): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.navigation/com.example.android.navigation.MainActivity}: android.view.InflateException: Binary XML file line #18: Error inflating class fragment
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.app.ActivityThread.access$600(ActivityThread.java:141)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.os.Handler.dispatchMessage(Handler.java:99)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.os.Looper.loop(Looper.java:137)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.app.ActivityThread.main(ActivityThread.java:5041)
09-20 03:30:17.025: E/AndroidRuntime(20329): at java.lang.reflect.Method.invokeNative(Native Method)
09-20 03:30:17.025: E/AndroidRuntime(20329): at java.lang.reflect.Method.invoke(Method.java:511)
09-20 03:30:17.025: E/AndroidRuntime(20329): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-20 03:30:17.025: E/AndroidRuntime(20329): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-20 03:30:17.025: E/AndroidRuntime(20329): at dalvik.system.NativeStart.main(Native Method)
09-20 03:30:17.025: E/AndroidRuntime(20329): Caused by: android.view.InflateException: Binary XML file line #18: Error inflating class fragment
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
09-20 03:30:17.025: E/AndroidRuntime(20329): at com.example.android.navigation.BasicMapActivity.onCreateView(BasicMapActivity.java:57)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1470)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:925)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1102)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1458)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:551)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1164)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.app.Activity.performStart(Activity.java:5114)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2153)
09-20 03:30:17.025: E/AndroidRuntime(20329): ... 11 more
09-20 03:30:17.025: E/AndroidRuntime(20329): Caused by: java.lang.RuntimeException: API key not found. Check that <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="your API key"/> is in the <application> element of AndroidManifest.xml
09-20 03:30:17.025: E/AndroidRuntime(20329): at maps.ag.bb.a(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at maps.ag.bb.a(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at maps.ag.an.a(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at maps.ag.bi.a(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at maps.ag.bh.a(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at blf.onTransact(SourceFile:107)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.os.Binder.transact(Binder.java:310)
09-20 03:30:17.025: E/AndroidRuntime(20329): at com.google.android.gms.maps.internal.IMapFragmentDelegate$a$a.onCreateView(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at com.google.android.gms.maps.SupportMapFragment$a.onCreateView(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at com.google.android.gms.internal.bh$4.b(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at com.google.android.gms.internal.bh.a(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at com.google.android.gms.internal.bh.onCreateView(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at com.google.android.gms.maps.SupportMapFragment.onCreateView(Unknown Source)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1470)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:898)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1080)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1182)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:280)
09-20 03:30:17.025: E/AndroidRuntime(20329): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
09-20 03:30:17.025: E/AndroidRuntime(20329): ... 23 more
这是我的源代码，我只改变了这个功能:
private void selectItem(int position) {
// update the main content by replacing fragments
Fragment mapfragment = new BasicMapActivity();
Fragment fragment = new PlanetFragment();
Bundle args = new Bundle();
args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
fragment.setArguments(args);
mapfragment.getFragmentManager();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, mapfragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mPlanetTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
这是我的 map fragment :
public class BasicMapActivity extends Fragment {
/**
* Note that this may be null if the Google Play services APK is not available.
*/
private GoogleMap mMap;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setUpMapIfNeeded();
//setContentView(R.layout.basic_demo);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//setUpMapIfNeeded();
View rootView = inflater.inflate(R.layout.basic_demo, container, false);
setUpMapIfNeeded();
return rootView;
}
@Override
public void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}
}
还有 BasicMapActivity 的 xml 文件:
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment"/>
编辑:
这是主程序的 XML:
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- As the main content view, the view below consumes the entire
space available using match_parent in both dimensions. -->
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- android:layout_gravity="start" tells DrawerLayout to treat
this as a sliding drawer on the left side for left-to-right
languages and on the right side for right-to-left languages.
The drawer is given a fixed width in dp and extends the full height of
the container. A solid background is used for contrast
with the content view. -->
<ListView
android:id="@+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:background="#111"/>
</android.support.v4.widget.DrawerLayout>
只要我的 list :
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.navigation"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="17" />
<permission
android:name="com.example.mapdemo.permission.MAPS_RECEIVE"
android:protectionLevel="signature"/>
<uses-permission android:name="com.example.mapdemo.permission.MAPS_RECEIVE"/>
<!-- Copied from Google Maps Library/AndroidManifest.xml. -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<!-- External storage for caching. -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<!-- My Location -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<!-- Maps API needs OpenGL ES 2.0. -->
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<meta-data android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyDJbPX63ZJni6sbzNxaFvFUCnYLb7-9o28"/>
<application
android:label="@string/app_name"
android:icon="@drawable/ic_launcher"
android:theme="@android:style/Theme.Holo.Light.DarkActionBar"
android:allowBackup="true">
<activity
android:name=".MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
有人可以给我提示吗？我在这里卡了2-3天。
非常感谢!
最佳答案
你的问题很简单
API KEY必须在Application标签里面，也应该放在最后
示例:
<application
android:label="@string/app_name"
android:icon="@drawable/ic_launcher"
android:theme="@android:style/Theme.Holo.Light.DarkActionBar"
android:allowBackup="true">
<activity
android:name=".MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyDJbPX63ZJni6sbzNxaFvFUCnYLb7-9o28"/>
</application>
关于java - Android - 将 map v2 实现到抽屉导航，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18911753/
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MIMO技术的优缺点优点通过下面三个增益来总体概括：阵列增益。阵列增益是指由于接收机通过对接收信号的相干合并而活得的平均SNR的提高。在发射机不知道信道信息的情况下，MIMO系统可以获得的阵列增益与接收天线数成正比复用增益。在采用空间复用方案的MIMO系统中，可以获得复用增益，即信道容量成倍增加。信道容量的增加与min(Nt,Nr)成正比分集增益。在采用空间分集方案的MIMO系统中，可以获得分集增益，即可靠性性能的改善。分集增益用独立衰落支路数来描述，即分集指数。在使用了空时编码的MIMO系统中，由于接收天线或发射天线之间的间距较远，可认为它们各自的大尺度衰落是相互独立的，因此分布式MIMO