ActivityNotFoundExceptionstarted无处不在

Question

在我的申请工作正常之前。我刚刚创建了一个新类（在同一个包中）并在清单中声明了它，我仍然得到ActivityNotFoundException，有时候NoClassDefFoundException。

TestActivity.java

public class TestActivity extends Activity {

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

    }
}

Activity_NewOrder.java

public class Activity_NewOrder extends Activity
try {
         //Also tried Intent intent = new Intent(Activity_NewOrder.this, TestActivity.class);
         Intent intent = new Intent(getApplicationContext(), TestActivity.class);
         startActivity(intent);
    } catch (ActivityNotFoundException e) {
         e.printStackTrace();
    }

的AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mypackage">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".Activities.Activity_OrderSummaryNew"
            android:configChanges="orientation|keyboardHidden"
            android:screenOrientation="landscape" />
        <activity
            android:name=".Activities.Activity_Login"
            android:configChanges="orientation"
            android:screenOrientation="landscape">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Activities.Activity_Orders"
            android:configChanges="orientation|keyboardHidden"
            android:screenOrientation="landscape" />
        <activity
            android:name=".Activities.Activity_NewOrder"
            android:configChanges="orientation|keyboardHidden"
            android:screenOrientation="landscape" />

        <activity
            android:name=".Activities.Activity_OrderHistory"
            android:configChanges="orientation|keyboardHidden"
            android:screenOrientation="landscape" />

        <activity android:name=".Activities.TestActivity" />

    </application>

</manifest>