出错提示：

    android.content.ActivityNotFoundException:
Unable to find explicit activity class

1. 刚开始发现这个问题，觉得是代码有问题，但实际上并不是。

CODE snipet

 @Override
        public void onClick(View v) {
            Intent intent = CrimeActivity.newIntent(getActivity(), mCrime.getId());
            startActivity(intent);
        }

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2. Solution

依据提示”have you declared this activity in your
AndroidManifest.xml?”，可以明白大概方向，google一处1，基本上就知道在AndroidManifest.xml中少了部分，只是我不太明白为什么非要在这里注册呢？

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

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

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

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后记

From this code, I learned lately that this code let the
OS can start it.

…to the manifest so that the OS can start
it.