meta-data在AndroidManifest中是以键值对的形式存在的，可以将meta-data放在application根节点下，也可以放在某个activity节点下。因为存放的位置不同，因此获取value时也要使用对应的方法，下面是我写的一个小测试。
代码如下：
先是在AndroidManifest中的application和mainActivity下添加两个meta-data属性。
<applicationandroid:allowBackup="true"android:icon="@drawable/ic_launcher"android:label="@string/app_name"android:theme="@style/AppTheme" ><meta-dataandroid:name="com.lzy.test"android:value="测试" /><activityandroid:name=".MainActivity"android:label="@string/app_name" ><meta-dataandroid:name="com.example.metatest.MainActivity.com.lzy.activity.test"android:value="Activity测试" /><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application>接下来在mainActivity中来获取这两个属性的值。package com.example.metatest;import android.app.Activity;import android.content.ComponentName;import android.content.pm.ActivityInfo;import android.content.pm.ApplicationInfo;import android.content.pm.PackageManager;import android.content.pm.PackageManager.NameNotFoundException;import android.os.Bundle;import android.util.Log;import android.widget.Toast;/** * meta 测试 * * @author Administrator * */public class MainActivity extends Activity {public static final String TEST = "com.lzy.test";public static final String ACTIVITYTEST = MainActivity.class.getName()+".com.lzy.activity.test";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);String test = getMetaDataStringApplication(TEST, null);String activityTest = getMetaDataStringFromActivity(ACTIVITYTEST, null);Toast.makeText(this, test+"–"+activityTest, Toast.LENGTH_LONG).show();}/** * 根据key从Application中返回的Bundle中获取value * * @param key * @param defValue * @return */private String getMetaDataStringApplication(String key, String defValue) {Bundle bundle = getAppMetaDataBundle(getPackageManager(), getPackageName());if (bundle != null && bundle.containsKey(key)) {return bundle.getString(key);}return defValue;}/** * 获取Application中的meta-data. * * @param packageManager * @param packageName * @return */private Bundle getAppMetaDataBundle(PackageManager packageManager,String packageName) {Bundle bundle = null;try {ApplicationInfo ai = packageManager.getApplicationInfo(packageName,PackageManager.GET_META_DATA);bundle = ai.metaData;} catch (NameNotFoundException e) {Log.e("getMetaDataBundle", e.getMessage(), e);}return bundle;}/** * 根据key从Activity中返回的Bundle中获取value * * @param key * @param defValue * @return */private String getMetaDataStringFromActivity(String key, String defValue) {Bundle bundle = getActivityMetaDataBundle(getPackageManager(), getComponentName());if (bundle != null && bundle.containsKey(key)) {return bundle.getString(key);}return defValue;}/** * 获取Activity中的meta-data. * * @param packageManager * @param component * @return */private Bundle getActivityMetaDataBundle(PackageManager packageManager, ComponentName component) {Bundle bundle = null;try {ActivityInfo ai = packageManager.getActivityInfo(component,PackageManager.GET_META_DATA);bundle = ai.metaData;} catch (NameNotFoundException e) {Log.e("getMetaDataBundle", e.getMessage(), e);}return bundle;}}源码下载
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可见内心底对旅行是多么的淡漠。
