Android使用元数据实现配置信息的传递方法详细介绍

<meta-data android:name="weather" android:value="xxx"/>

        <activity
            android:name=".MetaDataActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <meta-data android:name="weather" android:value="xxx"/>
        </activity>

<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:id="@+id/tv_meta"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

public class MetaDataActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_meta_data);
        TextView tv_meta = findViewById(R.id.tv_meta);
        //获取应用包管理器
        PackageManager pm = getPackageManager();
            try {
                //从应用包管理器中获取当前的活动信息
                ActivityInfo info = pm.getActivityInfo(getComponentName(), PackageManager.GET_META_DATA);
                //获取活动附加的元数据信息
                Bundle bundle = info.metaData;
                String weather = bundle.getString("weather");
                tv_meta.setText(weather);
            } catch (PackageManager.NameNotFoundException e) {
                e.printStackTrace();
            }
    }
}

     <activity
            android:name=".ActStartActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <meta-data android:name="android.app.shortcuts" android:resource="@xml/shortcuts"/>
        </activity>

<resources xmlns:android="http://schemas.android.com/apk/res/android">
    <shortcut
        android:shortcutId="first"
        android:enabled="true"
        android:icon="@mipmap/ic_launcher"
        android:shortcutLongLabel="@string/first_long"
        android:shortcutShortLabel="@string/first_short">
<!--文字太长则显示shotLabel ↑-->
<!--点击选项跳转到的页面 ↓-->
        <intent
            android:action="android.intent.action.VIEW"
            android:targetPackage="com.example.chapter2"
            android:targetClass="com.example.chapter2.ActStartActivity"/>
        <categories android:name="android.shortcut.conversation"/>
    </shortcut>
</resources>