<meta-data>的使用

来源：互联网发布：外汇手机看盘软件编辑：程序博客网时间：2024/05/18 00:07

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.need88.apptests">    <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">            <meta-data android:name="str1" android:value="activity meta"/>            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <service android:name=".service.MyService">            <meta-data android:name="str3" android:value="service meta"/>        </service>        <receiver android:name=".broadcastReceiver.MyReceiver">            <intent-filter>                <action android:name="android.intent.action.PHONE_STATE"/>            </intent-filter>            <meta-data android:name="str4" android:value="receiver meta"/>        </receiver>        <meta-data android:name="str2" android:value="application meta"/>    </application></manifest>

核心代码

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        try {            //获取Activity中的元数据            ActivityInfo activityInfo = getPackageManager().getActivityInfo(getComponentName(), PackageManager.GET_META_DATA);            String msg_activity = activityInfo.metaData.getString("str1");            Log.d("wl",getComponentName()+"的元数据是: "+ msg_activity);            //获取Application 中的元数据            ApplicationInfo applicationInfo = getPackageManager().getApplicationInfo(getPackageName(), PackageManager.GET_META_DATA);            String msg_applic = applicationInfo.metaData.getString("str2");            Log.d("wl",getPackageName()+"的元数据是: "+ msg_applic);            //获取service中的元数据            ComponentName componentName = new ComponentName(this, MyService.class);            ServiceInfo serviceInfo = getPackageManager().getServiceInfo(componentName, PackageManager.GET_META_DATA);            String msg_service = serviceInfo.metaData.getString("str3");            Log.d("wl",componentName+"的元数据是: "+ msg_service);            //在 Receiver中的应用            ComponentName receiver = new ComponentName(this, MyReceiver.class);            //没有 ReceiverInfo 类            ActivityInfo info = getPackageManager().getReceiverInfo(receiver, PackageManager.GET_META_DATA);            String msg_receiver = info.metaData.getString("str4");            Log.d("wl",receiver+"的元数据是: "+ msg_receiver);        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }    }}

打印日志

0 0