Introduction
接下來我們在點擊 Navigation Drawer item 時，加入點擊事件
Implement the method
首先我們先在代碼裡，呼叫 setNavigationItemSelectedListener 方法，去添加 Listener，接下來在 activity class 下實現 NavigationView.OnNavigationItemSelectedListener 接口，並覆寫 onNavigationItemSelected 方法
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| public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
Toolbar toolbar;
DrawerLayout drawerLayout;
NavigationView navigationView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.navigation_drawer);
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawerLayout = findViewById(R.id.drawer_layout);
navigationView = findViewById(R.id.navigation_view);
//這邊添加 NavigationItemSelectedListener
navigationView.setNavigationItemSelectedListener(this);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.open_drawer, R.string.close_drawer);
drawerLayout.addDrawerListener(toggle);
toggle.syncState();
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
// 實現此方法
return false;
}
}
|
Add function
接下來在 onNavigationItemSelected 方法中，把return 改為 true，並在方法裡取出 MenuItem 的 id 以 switch 判別哪個 item 被點擊。在 switch 部份結束後，我們呼叫 drawerLayout closeDrawer() 方法，表示在點擊事件結束後，會關閉 drawer。
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| public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
...
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.inbox_id:
// 這邊新增要呼叫的方法
Toast.makeText(getApplicationContext(), "inbox", Toast.LENGTH_LONG).show();
break;
case R.id.starred_id:
Toast.makeText(getApplicationContext(), "starred", Toast.LENGTH_LONG).show();
break;
case R.id.sent_id:
Toast.makeText(getApplicationContext(), "sent mail", Toast.LENGTH_LONG).show();
break;
case R.id.drafts_id:
Toast.makeText(getApplicationContext(), "drafts", Toast.LENGTH_LONG).show();
break;
case R.id.allmail_id:
Toast.makeText(getApplicationContext(), "all mail", Toast.LENGTH_LONG).show();
break;
case R.id.trash_id:
Toast.makeText(getApplicationContext(), "trash", Toast.LENGTH_LONG).show();
break;
case R.id.spam_id:
Toast.makeText(getApplicationContext(), "spam", Toast.LENGTH_LONG).show();
break;
}
// 關閉 drawer，GravityCompat.START 表示 drawer 關閉會回到螢幕的左方
drawerLayout.closeDrawer(GravityCompat.START);
return true;
}
}
|
運行效果如下:
參考網站:
Android Developer
Material Design