Android应用开发之MetaData之数据挖掘

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        今天我们学习如何为Activity、Service、BroadcastReceiver等组件设置MetaData元数据，下面给出该场景的案例：

1案例技术要点（待整理）

2案例代码陈列

2.1AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.lynn.metadata"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="8" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >        <activity            android:label="@string/app_name"            android:name=".MetaDataMainActivity" >            <intent-filter >                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>                        <meta-data android:name="cn.lynn.name" android:value="lynn1229"/>            <meta-data android:name="cn.lynn.age" android:value="25"/>            <meta-data android:name="cn.lynn.app" android:value="@string/app_name"/>            <meta-data android:name="cn.lynn.id" android:resource="@string/app_name"/>        </activity>    </application></manifest>

2.2strings.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">Activity的MetaData元数据使用</string></resources>

2.3main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/app_name" /></LinearLayout>

2.4MetaDataMainActivity.java

package cn.lynn.metadata;import android.app.Activity;import android.content.ComponentName;import android.content.pm.ActivityInfo;import android.content.pm.PackageManager;import android.content.pm.PackageManager.NameNotFoundException;import android.os.Bundle;import android.widget.Toast;public class MetaDataMainActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        try {            ActivityInfo activityInfo = this.getPackageManager().getActivityInfo(new ComponentName(this, MetaDataMainActivity.class), PackageManager.GET_META_DATA);            Bundle bundle = activityInfo.metaData;            String name = bundle.getString("cn.lynn.name");            String app = bundle.getString("cn.lynn.app");            int age = bundle.getInt("cn.lynn.age");            int sourceid = bundle.getInt("cn.lynn.id");            Toast.makeText(this, "name= " + name + ", age=" + age + ", app= " + app + ", sourceid= " + sourceid, Toast.LENGTH_LONG).show();        } catch (NameNotFoundException e) {            e.printStackTrace();        }    }}

3案例效果展示