Android基础——intent的ComponentName

intent通过ComponentName指定要执行的组件名字，创建一个Activity时就可以用这个方式进行指定

通过Main启动Detail

两个活动的布局

Detail

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="详细内容"/>

</LinearLayout>

Main

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

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="详细信息"/>

</LinearLayout>

java调用代码

package com.example.myintenti;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.KeyEventDispatcher;

import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

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

        //ComponentName属性：要启动的组件名字
        Button button = (Button)findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override//使用ComponentName属性创建一个活动
            public void onClick(View v) {
                Intent intent = new Intent();
                ComponentName componentName = new ComponentName(
                        "com.example.mtintenti","com.example.mtintenti.DetailActivity"
                );
                intent.setComponent(componentName);
                startActivity(intent);
            }
        });
    }
}