public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.e(TAG, "onCreate: 111");
        Uri uri = Uri.parse("content://ngyb.ltz/insert");
        Log.e(TAG, "onCreate: 222");
        getContentResolver().registerContentObserver(uri, true, new ContentObserver(new Handler()) {
            @Override
            public void onChange(boolean selfChange) {
                //System.out.println("哈哈哈,我执行了");
                Log.e(TAG, "onChange:哈哈哈,我执行了 ");
                super.onChange(selfChange);
            }
        });
    }
}