【异常解决】android.content.ActivityNotFoundException: Unable to find explicit activity class

异常：
01-01 16:19:13.269: E/AndroidRuntime(2969): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.x210.communication/com.x210.communication.SubActivity};have you declared this activity in your AndroidManifest.xml?
问题呈现：

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
textView = (TextView) findViewById(R.id.textShow);
final Button btn1 = (Button) findViewById(R.id.btn1);

btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(ActivityCommunication.this,
SubActivity.class);
startActivity(intent);//从当前Activity跳转到SubActivity
}
});
}

AndroidManifest.xml

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".ActivityCommunication" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />

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

</application>

问题解决：
其实可以根据错误提示：have you declared this activity in your AndroidManifest.xml?    知道错误根源是在清单文件中没有注册Activity；

在AndroidManifest.xml的<application></application>节点中添加如下注册代码即可：

<activity android:name =".SubActivity"/>