Android meta-data

Android meta-data数据的读取

meta-data元数据，当我们在集成第三方sdk时会经常遇到，比如百度地图sdk，talkingData统计等，所以做了一个小总结，以备使用。

在清单文件中，meta-data可以在Application,Activity,Service,Receiver中，在不同的位置，读取数据的方式有稍微的差别，现写了一个小demo。

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.dc.metadatasummary01">    <application    android:allowBackup="true"    android:icon="@mipmap/ic_launcher"    android:label="@string/app_name"    android:supportsRtl="true"    android:theme="@style/AppTheme">    <activity android:name=".MainActivity">        <intent-filter>            <action android:name="android.intent.action.MAIN" />            <category android:name="android.intent.category.LAUNCHER" />        </intent-filter>        <!--位于activity中-->        <meta-data            android:name="in_main_activity"            android:value="I am in activity"></meta-data>    </activity>    <service android:name=".DCTestMetaDataService">        <!--位于服务中-->        <meta-data            android:name="in_service"            android:value="I am in Service"></meta-data>    </service>    <receiver android:name=".DCTestMetaDataReceiver">        <!--位于广播接收者中-->        <intent-filter>            <action android:name="dc_test_meta_data_receiver"></action>        </intent-filter>        <meta-data            android:name="in_receiver"            android:value="I am in Receiver"></meta-data>    </receiver>        <!--位于application中-->    <meta-data        android:name="in_application"        android:value="I am in application"></meta-data></application></manifest>

1.Activity中拿取数据

ActivityInfo info = this.getPackageManager().getActivityInfo(getComponentName(),PackageManager.GET_META_DATA);String msg = info.metaData.getString("in_main_activity");

2.Application中拿取数据

ApplicationInfo appInfo = this.getPackageManager().getApplicationInfo(getPackageName(),PackageManager.GET_META_DATA);String msg = appInfo.metaData.getString("in_application");

3.Service中拿取数据

ComponentName cn = new ComponentName(this, DCTestMetaDataService.class);ServiceInfo info2 = this.getPackageManager().getServiceInfo(cn, PackageManager.GET_META_DATA);String msg = info2.metaData.getString("in_service");

4.Receiver中拿取数据

ComponentName cn = new ComponentName(context, DCTestMetaDataReceiver.class);ActivityInfo info = context.getPackageManager().getReceiverInfo(cn, PackageManager.GET_META_DATA);String msg = info.metaData.getString("in_receiver");

MainActivity代码

 @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //拿取activity中的元数据        ActivityInfo info = null;        try {            info = this.getPackageManager()                    .getActivityInfo(getComponentName(),                            PackageManager.GET_META_DATA);            String msg = info.metaData.getString("in_main_activity");            Toast.makeText(MainActivity.this, msg, Toast.LENGTH_LONG).show();        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }        //拿取application中的元数据        ApplicationInfo appInfo = null;        try {            appInfo = this.getPackageManager()                    .getApplicationInfo(getPackageName(),                            PackageManager.GET_META_DATA);            String msg = appInfo.metaData.getString("in_application");            Toast.makeText(MainActivity.this, msg, Toast.LENGTH_LONG).show();        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }        //开启服务        startService(new Intent(MainActivity.this, DCTestMetaDataService.class));        //发送广播        Intent intent = new Intent();        intent.setAction("dc_test_meta_data_receiver");        sendBroadcast(intent);    }    @Override    protected void onDestroy() {        //关闭服务        stopService(new Intent(MainActivity.this, DCTestMetaDataService.class));        super.onDestroy();    }

DCTestMetaDataReceiver代码

/** * @author zyc *  created at 2016/4/22 18:01 */public class DCTestMetaDataReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        if (TextUtils.equals(intent.getAction(), "dc_test_meta_data_receiver")) {            ComponentName cn = new ComponentName(context, DCTestMetaDataReceiver.class);            ActivityInfo info = null;            try {                info = context.getPackageManager()                        .getReceiverInfo(cn, PackageManager.GET_META_DATA);                String msg = info.metaData.getString("in_receiver");                Toast.makeText(context, msg, Toast.LENGTH_LONG).show();            } catch (PackageManager.NameNotFoundException e) {                e.printStackTrace();            }        }    }}

DCTestMetaDataService代码

/** * @author zyc * created at 2016/4/22 11:42 */public class DCTestMetaDataService extends Service {    @Override    public IBinder onBind(Intent intent) {        return null;    }    @Override    public void onCreate() {        super.onCreate();    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        //拿到meta-data元数据        ComponentName cn = new ComponentName(this, DCTestMetaDataService.class);        ServiceInfo info2 = null;        try {            info2 = this.getPackageManager().getServiceInfo(cn, PackageManager.GET_META_DATA);            String msg = info2.metaData.getString("in_service");            Toast.makeText(this, msg, Toast.LENGTH_LONG).show();        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }        return super.onStartCommand(intent, flags, startId);    }    @Override    public void onDestroy() {        super.onDestroy();    }}

ok，so easy……