Android隐式调用intent问题求解

AndroidManifest：<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="example.com.activitytest">    <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=".FirstActivity"
            android:label="This is FirstActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>        <activity android:name=".SecondActivity">
            <intent-filte>
                <actioin android:name="example.com.activitytest.ACTION_START"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filte>
        </activity>
    </application></manifest>
FirstActivity：protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_layout);
        Button button1 = (Button)findViewById(R.id.button_1);
        button1.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                Intent intent = new Intent();
                intent.setAction("example.com.activitytest.ACTION_START");
                startActivity(intent);
            }
        });    }
报错一直显示无法 No Activity found to handle Intent{ act=example.com.activitytest.ACTION_START }，但是.....我代码找不出问题啊，改写的都写了啊。