我知道这是一个经常被问到的问题,但在阅读了Stack Overflow上许多问题和解决方案后,我感到困惑。我对Fragments
以及从导航抽屉中单击项目开始活动所需的内容感到困惑。
请问有人能够解释一下如何从这个导航抽屉项开始一个基本的活动吗?我是否需要在代码中指定的位置实现一个onClick
方法?还有这与Intent有什么关系?
这是我的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);
}
这里是第二个活动,Playboard.java,它只是加载一个背景图片:
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);
}
}
非常感谢您的所有输入!
import android.content.Intent;
。不过,Android Studio 和 Eclipse 都可以帮助您解决缺少的导入问题。 - George Mulligan