[英]Starting a new activity on navigation drawer item click
我知道這是一個經常被問到的問題,但是在閱讀了有關堆棧溢出的許多問題和解決方案后,我感到很困惑。 我對Fragments
以及通過單擊導航抽屜中的項目啟動活動所需的條件感到困惑。
有人可以解釋一下從這個導航抽屜項目開始基本活動需要什么嗎? 我需要在代碼中指定的地方實現onClick
方法嗎? 這與意圖有何關系?
這是我的 MainActivity.java
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
DrawerLayout drawerLayout;
ActionBarDrawerToggle drawerToggle;
NavigationView navigation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initInstances();
}
private void initInstances() {
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
drawerToggle = new ActionBarDrawerToggle(MainActivity.this, drawerLayout, R.string.hello_world, R.string.hello_world);
drawerLayout.setDrawerListener(drawerToggle);
navigation = (NavigationView) findViewById(R.id.navigation_view);
navigation.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
int id = menuItem.getItemId();
switch (id) {
case R.id.navigation_item_1:
//Do some thing here
// add navigation drawer item onclick method here
break;
case R.id.navigation_item_2:
//Do some thing here
// add navigation drawer item onclick method here
break;
case R.id.navigation_item_3:
//Do some thing here
// add navigation drawer item onclick method here
break;
case R.id.navigation_item_4:
//Do some thing here
// add navigation drawer item onclick method here
break;
case R.id.navigation_item_5:
//Do some thing here
// add navigation drawer item onclick method here
break;
}
return false;
}
});
}
@Override
public void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
drawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
drawerToggle.onConfigurationChanged(newConfig);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.navigation_view_items, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (drawerToggle.onOptionsItemSelected(item))
return true;
// 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.string.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
這是第二個活動 Playboard.java,它只加載背景圖像:
import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class Playboard extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_playboard);
}
}
非常感謝所有輸入,謝謝!
對於每個 case 語句,您只需指定要通過Intent
啟動的Activity
。
例如,您想在選擇navigation_item_1
時啟動Playboard
活動。
您可以將此代碼添加到該特定case
。
case R.id.navigation_item_1:
Intent i = new Intent(MainActivity.this, Playboard.class);
startActivity(i);
break;
而不是
NavigationUI.setupWithNavController(navigationView, navController);
這樣做
navigationView.setNavigationItemSelectedListener(new
NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Toast.makeText(MainActivity.this, "clicked", Toast.LENGTH_SHORT).show();
return false;
}
}
);
一個警告:如果抽屜盒上有任何動畫,直接從主線程啟動 Activity 會導致動畫過早結束並看起來很奇怪。 要解決此問題,您可以執行以下操作(代碼使用 retrolambda 來美觀,但這不是必需的):
Class<? extends Activity> activityClass = null;
switch (menuItem.getItemId()) {
case R.id.navigation_item_1:
activityClass = MainActivity.class;
break;
}
final Class<?> finalActivityClass = activityClass;
Executors.newSingleThreadExecutor().execute(() -> {
Intent intent = new Intent(getApplicationContext(), finalActivityClass);
startActivity(intent);
});
menuItem.setChecked(true);
mDrawerLayout.closeDrawers();
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