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