我试图隐藏RecyclerView
,直到用户传递了一些有效信息。但它没有发生。当我尝试这个时会发生一些奇怪的事情,但它并没有显示任何错误。
这是我的代码:
MainActivity.java
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private LinearLayout recyclerRow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Paper.init(getApplicationContext());
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
NavigationDrawerFragment drawerFragment = (NavigationDrawerFragment) getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), (Toolbar) findViewById(R.id.app_bar));
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.goalList);
RVAdapter adapter = new RVAdapter(getApplicationContext(), getData());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
recyclerRow = (LinearLayout) findViewById(R.id.goal_row);
if(Paper.get("goalTitle") == null){
recyclerView.setVisibility(View.GONE);
recyclerRow.setVisibility(View.GONE);
}
}
public List<RVData> getData() {
Log.d("Check6", Paper.get("goalTitle") + "");
List<RVData> data = new ArrayList<>();
String[] titles = {(String) Paper.get("goalTitle")};
for (int i = 0; i < titles.length; i++) {
RVData current = new RVData();
current.goalTitle = titles[i];
data.add(current);
}
return data;
}
public void newGoal(View view) {
Intent intent = new Intent(MainActivity.this, NewGoal.class);
startActivity(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
我正在使用Paper作为我的数据库。