Android Studio 简单的JunitTest

 1public class MainActivity extends AppCompatActivity {
 2
 3    // Used to load the 'native-lib' library on application startup.
 4    static {
 5        System.loadLibrary("kikt-camera");
 6    }
 7
 8    @Override
 9    protected void onCreate(Bundle savedInstanceState) {
10        super.onCreate(savedInstanceState);
11        setContentView(R.layout.activity_main);
12
13        // Example of a call to a native method
14        TextView tv = (TextView) findViewById(R.id.sample_text);
15        tv.setText(stringFromJNI());
16    }
17
18    /**
19     * A native method that is implemented by the 'native-lib' native library,
20     * which is packaged with this application.
21     */
22    public native String stringFromJNI();
23
24    public void showTest() {
25        Log.d("MainActivity", stringFromJNI());
26    }
27}

 1@RunWith(JUnit4.class)
 2public class MainActivityTest {
 3
 4    @Rule
 5    public ActivityTestRule<MainActivity> rule = new ActivityTestRule<>(MainActivity.class);
 6
 7    @Test
 8    public void stringFromJNI() throws Exception {
 9        MainActivity activity = rule.getActivity();
10        TextView textView = (TextView) activity.findViewById(R.id.sample_text);
11        String s = textView.getText().toString();
12        Log.d("MainActivityTest", s);
13        Log.d("MainActivityTest", activity.stringFromJNI());
14    }
15
16}