我正在使用导航抽屉模板。在我的主活动中,我有"HomeFragment",其中有许多ImageViews。我想点击其中一个图像视图,我希望它把我带到另一个片段,其中包含该图像视图的更大图片和一些文本。然后我想按后退按钮,并希望它将我带回上一个片段。
请有人通过提供代码来提供帮助吗?然后,我将研究代码以了解其工作原理。
主活动代码:
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
// Code to display Home Fragment on App Launch Page
HomeFragment homeFragment = new HomeFragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.relativelayout_for_fragment,
homeFragment,
homeFragment.getTag()
).commit();
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.action_LoginPage:
Intent intent = new Intent(this, LoginPageMain.class);
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Code for Nav Bar Item Clicks (Button Clicks)
int id = item.getItemId();
// Code to link Fragment to Button
if (id == R.id.nav_home) {
HomeFragment homeFragment = new HomeFragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.relativelayout_for_fragment,
homeFragment,
homeFragment.getTag()
).commit();
} else if (id == R.id.nav_SUV) {
SUVFragment suvFragment = new SUVFragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.relativelayout_for_fragment,
suvFragment,
suvFragment.getTag()
).commit();
} else if (id == R.id.nav_hatchbacks) {
HatchbackFragment hatchbackFragment = new HatchbackFragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.relativelayout_for_fragment,
hatchbackFragment,
hatchbackFragment.getTag()
).commit();
} else if (id == R.id.nav_coupes) {
CoupesFragment coupesFragment = new CoupesFragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.relativelayout_for_fragment,
coupesFragment,
coupesFragment.getTag()
).commit();
} else if (id == R.id.nav_find_us) {
FindUsFragment findUsFragment = new FindUsFragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.relativelayout_for_fragment,
findUsFragment,
findUsFragment.getTag()
).commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
HomeFragment 代码(我想用将用户带到第二个片段的代码替换显示"它已被单击"的位(
import android.app.AlertDialog;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
/**
* A simple {@link Fragment} subclass.
*/
public class HomeFragment extends Fragment {
public HomeFragment() {
// Required empty public constructor
}
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.home_fragment, container, false);
ImageView button1 = (ImageView) view.findViewById(R.id.imageViewa45);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder alert = new AlertDialog.Builder(v.getContext());
alert.setTitle("its been clicked");
alert.show();
}
});
return view;
}
}
主页片段 XML 代码:
<ImageView
android:id="@+id/imageViewa45"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignBottom="@+id/imageView2"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginBottom="318dp"
android:src="@drawable/a45hatchback" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_marginTop="350dp"
android:src="@drawable/velarad" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="310dp"
android:src="@drawable/rs5coupe" />
</RelativeLayout>
A45片段(我希望用户在单击图像视图后看到的片段(
public class A45Fragment {
}
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
A45Fragment findUsFragment = new A45Fragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.relativelayout_for_fragment,
findUsFragment,
findUsFragment.getTag()
).commit();
}
});
试试这个。通过使用上面的调用,您可以在图像单击时加载片段。