MainActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Activity.MainActivity">

    <Button
        android:id="@+id/ys_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="309dp"
        android:text="使用隐式Intent打开TargetActivity"
        tools:layout_editor_absoluteX="140dp"
        tools:layout_editor_absoluteY="293dp" />
</RelativeLayout>

TargetActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Activity.TargetActivity">

    <TextView
        android:id="@+id/textView7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="271dp"
        android:layout_marginEnd="47dp"
        android:text="恭喜您，成功使用隐式Intent打开了这个Activity！！"
        android:textSize="14dp"
        tools:layout_editor_absoluteX="142dp"
        tools:layout_editor_absoluteY="190dp" />
</RelativeLayout>

AndroidManifest.xml

 <activity android:name=".Activity.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".Activity.TargetActivity" >
            <intent-filter>
                <action android:name="yinshiIntent"/>
                <category android:name="my_intent"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </activity>

MainActivity.java

package com.example.learning.Activity;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import com.example.learning.R;

public class MainActivity extends AppCompatActivity {
    

    // 声明组件
    Button ys_btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        // 获取组件
        ys_btn = findViewById(R.id.ys_btn);

        // 添加点击事件
        ys_btn.setOnClickListener(new View.OnClickListener() {
    
            @Override
            public void onClick(View v) {
    
                // 创建隐式启动
                Intent intent = new Intent();
                intent.setAction("yinshiIntent");   // 指定Action
                intent.addCategory("my_intent");    // 指定Category
                startActivity(intent);
            }
        });
    }
}