AndroidManifest.png

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.elly.myapplication">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".BActivity" android:exported="false">
            <!--//export 是否导出(导出就可以被其它应用调用访问  false 不能被外部应用访问   true 能被外部应用访问)-->
            <intent-filter>
                <action android:name="com.example.elly.myapplication.intent.action.BActivity"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

图片.png

public final static String ACTION = "com.example.elly.myapplication.intent.action.BActivity";

//
startActivity(new Intent(BActivity.ACTION));