android 获取application和activity下meta-data中的值

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。

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<meta-data
android:name="com.lzy.test"
android:value="测试" />
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<meta-data
android: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";
@Override
protected 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;
}
}

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android 获取application和activity下meta-data中的值

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