小编use*_*095的帖子

我正在为Android开发谷歌地图应用程序.

但是,不知怎的,我的应用程序崩溃给出了如下错误:

java.lang.IllegalStateException: A required meta-data tag in your app's AndroidManifest.xml does not exist.  

这是我的AndroidManifest.xml的样子: -

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.locations"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
  <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true"/>
  <permission android:name ="com.example.locations.permission.MAPS_RECEIVE" android:protectionLevel="signature"></permission>

  <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.locations.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="AIzaSyAZhJllASbTnrFta8hj55shKydSi0ks824"/>

    </application>

</manifest>

日志: -

01-09 12:29:35.249: E/AndroidRuntime(7448): Caused by: java.lang.IllegalStateException: A required …

I have a array:-

private string[][] barValues = new string[][] { new string[]{ "1.9", "5.8", "4.8", "Since Inception", "24-Jan 2014 to 24 Jun 2014" },
                                                new string[]{"1.2", "16.5","9.8", "Year to date","01-Apr 2014 to 24-Jun 2014" }, 
                                                new string[]{"11.6","28.8","23.5","Last quarter","01-Jan to 24-Jun 2014"} };

I want to convert this array into my custom list :-

List<Portfolio> list = new List<Portfolio>();

I tried doing :-

List<Portfolio> list=myArray.Cast<Portfolio>().ToList();

But I get a error:-

System.InvalidCastException: Cannot cast from source type to destination type.

How …

我有一个ArrayList,它有一些元素.重复此列表中的项目.我想将类似的值分组并将其转换为数组.

目前我的ArrayList是: -

ArrayList<String> isonC = new ArrayList<String>();

isonC =`[a,a,a,a,b,c,c,C,c,c,c,d,d,d,d,d,d,d]的值I组合如下: -

icons = isonC.toArray(new String[isonC.size()]);
icons = new HashSet<String>(Arrays.asList(icons)).toArray(new String[0]);

我得到的值为: - icons = [a, c, b,d]

而元素的实际顺序应为: -

[a,b, c,d]

为什么第二和第三个值互换了？

任何建议都会有所帮助.谢谢

我在片段中有以下构造函数：-

public PlaceDialogFragment(Place place, DisplayMetrics dm){
        super();
        this.mPlace = place;
        this.mMetrics = dm;
    }

我也试过这个：-

public static final DialogFragment newInstance(Place place, DisplayMetrics dm)
{
    DialogFragment fragment = new DialogFragment();
    Bundle bundle = new Bundle(2);
    bundle.putParcelable("Place", place);
    bundle.putLong("Metrics", dm);
    fragment.setArguments(bundle);
    return fragment ;
}

但是bundle.putLong("Metrics", dm) 网上有错误

这Place是一个实现 Parceable 接口的类

但我收到一条错误消息：-

Avoid non-default constructors in fragments: use a default constructor plus Fragment#setArguments(Bundle) instead

任何建议如何解决这个问题？