如何解决在Android Studio中的片段中打开片段
我有一个框架布局。在其中设置了扫描仪视图。
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:orientation="vertical"
android:id="@+id/root"
android:padding="10dp">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.budiyev.android.codescanner.CodeScannerView
android:id="@+id/scanner_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:autoFocusButtonColor="@android:color/white"
app:autoFocusButtonVisible="true"
app:flashButtonColor="@android:color/white"
app:flashButtonVisible="true"
app:frameColor="@android:color/white"
app:frameCornersSize="50dp"
app:frameCornersRadius="0dp"
app:frameAspectRatioWidth="1"
app:frameAspectRatioHeight="1"
app:frameSize="0.75"
app:frameThickness="2dp"
app:maskColor="#77000000"/>
</FrameLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
现在我要在另一个片段上打开它，但我不想这样做。我想在按钮上单击打开它
@BindView(R.id.start_scan)
ImageButton startScan;
public void bindListners()
{
startScan.setOnClickListener(startScanning);
}
private final View.OnClickListener startScanning = v -> {
if(v.getId()==R.id.start_scan){
//here I want to call it
}
}
更新1个MainActivity
我的MainActivity中还有一些其他片段。以下是我的整个主要活动代码
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
//fragments
ScanFragment scanFragment = null;
NewFormFragment mNewFormFragment = null;
InstallationListFragment mInstallationListFragment = null;
ProgressFragment progressFragment = null;
boolean quitPress = false;
NavigationView navigationView;
@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) {
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
}
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
}
@Override
public void onDrawerSlide(View drawerView,float slideOffset) {
super.onDrawerSlide(drawerView,slideOffset);
Common.hideSoftKeyboard(MainActivity.this);
}
@Override
public void onDrawerStateChanged(int newState) {
super.onDrawerStateChanged(newState);
}
};
drawer.setDrawerListener(toggle);
toggle.syncState();
navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
mNewFormFragment = new NewFormFragment();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.setCustomAnimations(android.R.animator.fade_in,android.R.animator.fade_out,android.R.animator.fade_in,android.R.animator.fade_out)
.replace(R.id.fragment_container,mNewFormFragment,Constants.FRAGMENTS_NEW_FORM_TAG)
.commit();
fragmentManager.executePendingTransactions();
navigationView.setCheckedItem(R.id.new_form);
View headerView = navigationView.getHeaderView(0);
TextView t = (TextView) headerView.findViewById(R.id.user_name);
t.setText(Common.SharedPreferenceHelper.getSharedPreference(this,getString(R.string.user_name_key),""));
Log.d("zaidi","auth = "+Common.getAuthKey(this));
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
}
FragmentManager manager = getFragmentManager();
if (manager.getBackStackEntryCount() == 0 && !quitPress) {
Toast.makeText(MainActivity.this,"Press again to quit",Toast.LENGTH_SHORT).show();
quitPress = true;
} else {
quitPress = false;
try {
super.onBackPressed();
} catch (Exception e) {
}
}
if (manager.getBackStackEntryCount() > 0) {
String backStack = manager.getBackStackEntryAt(manager.getBackStackEntryCount() - 1).getName();
setNavigationItem(getMenuIdByTag(backStack));
} else {
setNavigationItem(getMenuIdByTag(Constants.FRAGMENTS_NEW_FORM_TAG));
}
}
private void setNavigationItem(int id) {
try {
navigationView.getMenu().getItem(id).setChecked(true);
} catch (Exception e) {
e.printStackTrace();
}
}
private int getMenuIdByTag(String tag) {
switch (tag) {
case Constants.FRAGMENTS_NEW_FORM_TAG: {
return 0;
}
case Constants.FRAGMENT_INSTALLATIONS_TAG: {
return 1;
}
case Constants.FRAGMENT_INSTALLATION_PROGRESS_TAG: {
return 2;
}
case Constants.FRAGMENT_SETTINGS_TAG: {
return 3;
}
default: {
return -1;
}
}
}
@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 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();
Common.hideSoftKeyboard(MainActivity.this);
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
SettingsFragment myFragment = (SettingsFragment) getFragmentManager().findFragmentByTag(Constants.FRAGMENT_SETTINGS_TAG);
if (myFragment != null && myFragment.isVisible()) {
// add your code here
} else {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.setCustomAnimations(android.R.animator.fade_in,android.R.animator.fade_out)
.replace(R.id.fragment_container,new SettingsFragment(),Constants.FRAGMENT_SETTINGS_TAG)
.addToBackStack(Constants.FRAGMENT_SETTINGS_TAG).commit();
fragmentManager.executePendingTransactions();
setNavigationItem(getMenuIdByTag(Constants.FRAGMENT_SETTINGS_TAG));
}
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.new_form) {
NewFormFragment myFragment = (NewFormFragment) getFragmentManager().findFragmentByTag(Constants.FRAGMENTS_NEW_FORM_TAG);
if (myFragment != null && myFragment.isVisible() && this.getTitle() == "New Form") {
// add your code here
} else if (mNewFormFragment == null) {
mNewFormFragment = new NewFormFragment();
}
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.setCustomAnimations(android.R.animator.fade_in,android.R.animator.fade_out)
.replace(R.id.fragment_container,Constants.FRAGMENTS_NEW_FORM_TAG)
.addToBackStack(Constants.FRAGMENTS_NEW_FORM_TAG).commit();
fragmentManager.executePendingTransactions();
} else if (id == R.id.action_settings) {
SettingsFragment myFragment = (SettingsFragment) getFragmentManager().findFragmentByTag(Constants.FRAGMENT_SETTINGS_TAG);
if (myFragment != null && myFragment.isVisible()) {
// add your code here
} else {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.setCustomAnimations(android.R.animator.fade_in,Constants.FRAGMENT_SETTINGS_TAG)
.addToBackStack(Constants.FRAGMENT_SETTINGS_TAG).commit();
fragmentManager.executePendingTransactions();
}
} else if (id == R.id.installations) {
InstallationListFragment myFragment = (InstallationListFragment) getFragmentManager().findFragmentByTag(Constants.FRAGMENT_INSTALLATIONS_TAG);
if (myFragment != null && myFragment.isVisible()) {
// add your code here
} else {
if (this.mInstallationListFragment == null) {
this.mInstallationListFragment = new InstallationListFragment();
}
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.setCustomAnimations(android.R.animator.fade_in,mInstallationListFragment,Constants.FRAGMENT_INSTALLATIONS_TAG)
.addToBackStack(Constants.FRAGMENT_INSTALLATIONS_TAG).commit();
fragmentManager.executePendingTransactions();
}
} else if (id == R.id.progress) {
ProgressFragment myFragment = (ProgressFragment) getFragmentManager().findFragmentByTag(Constants.FRAGMENT_INSTALLATION_PROGRESS_TAG);
if (myFragment != null && myFragment.isVisible()) {
// add your code here
} else {
if (this.progressFragment == null) {
this.progressFragment = new ProgressFragment();
}
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.setCustomAnimations(android.R.animator.fade_in,progressFragment,Constants.FRAGMENT_INSTALLATION_PROGRESS_TAG)
.addToBackStack(Constants.FRAGMENT_INSTALLATION_PROGRESS_TAG).commit();
fragmentManager.executePendingTransactions();
}
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onRequestPermissionsResult(int requestCode,String permissions[],int[] grantResults) {
switch (requestCode) {
case Constants.MY_PERMISSIONS_LOCATION_REQUEST_CODE: {
// If request is cancelled,the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted,yay! Do the
// contacts-related task you need to do.
mNewFormFragment.getGPSLocation();
} else {
// permission denied,boo! Disable the
// functionality that depends on this permission.
}
return;
}
case Constants.MY_PERMISSIONS_CAMERA_REQUEST_CODE: {
// If request is cancelled,yay! Do the
// contacts-related task you need to do.
if (mNewFormFragment.checkStoragePermission()) {
mNewFormFragment.openCamera();
}
} else {
// permission denied,boo! Disable the
// functionality that depends on this permission.
}
return;
}
case Constants.MY_PERMISSIONS_STORAGE_REQUEST_FOR_CAMERA_CODE: {
// If request is cancelled,yay! Do the
mNewFormFragment.openCamera();
} else {
// permission denied,boo! Disable the
// functionality that depends on this permission.
}
return;
}
case RefreshRefrenceNumber.WRITE_PERMISSION_REQUEST_CODE_REF_NO: {
// If request is cancelled,the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted,yay! Do the
RefreshRefrenceNumber.refreshManagerInstance(this).refreshReferenceNumber();
RefreshMeterNumber.refreshManagerInstance(this).refreshMetetNumber();
RefreshImsiNumber.refreshManagerInstance(this).refreshImsiNumber();
} else {
// permission denied,boo! Disable the
// functionality that depends on this permission.
}
return;
}
}
}}
任何帮助将不胜感激。
解决方法
当我必须管理几个片段时，一个片段的动作可以启动另一个片段，这是我使用的体系结构： 一个管理片段启动的父活动，我们称其为MainActivity： 和框架： Fragment1和Fragment2：这是代码：
MainActivity
public class MAinActivity extends AppCompatActivity implements
Fragment1.ActionListener,Fragment2.ActionListener {
private FragmentManager manager=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
manager=getSupportFragmentManager();
//you should launch one fragment at startup
changefrag(new Fragment1());
}
public void changefrag(Fragment frag) {
manager = getSupportFragmentManager();
if (!manager.beginTransaction().isEmpty()) {
manager.beginTransaction().detach(frag);
}
manager.beginTransaction()
.replace(R.id.activity_main_frame_layout,frag).commit();
}
/**
*
*To start Fragment1 when action is perform in Fragment2
*/
@Override
public void onFragment1() {
changefrag(new Fragment1());
}
/**
* to start frament 2 when action is performe inside Fragment1
* @param id
*/
@Override
public void onFragment2() {
changefrag(new Fragment2());
}
}
Fragment1：
public class Fragment1 extends Fragment {
private ActionListener listerner;
public Fragment1() {
// Required empty public constructor
}
public static Fragment1 newInstance() {
Fragment1 fragment = new Fragment1();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
listener=(ActionListener)getActivity();
}
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view=inflater.inflate(R.layout.fragment_1,container,false);
view.findViewById(R.id.start_frag2).setOnClickListener(new
View.OnClickListener() {
@Override
public void onClick(View view) {
listener.onFragment2();
}
});
return view;
}
public interface ActionListener{
void onFragment2();
}
}
Fragment2：
public class Fragment2 extends Fragment {
private ActionListener listerner;
public Fragment1() {
// Required empty public constructor
}
public static Fragment2 newInstance() {
Fragment2 fragment = new Fragment2();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
listener=(ActionListener)getActivity();
}
@Override
public View onCreateView(LayoutInflater inflater,Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view=inflater.inflate(R.layout.fragment_2,false);
view.findViewById(R.id.start_frag1).setOnClickListener(new
View.OnClickListener() {
@Override
public void onClick(View view) {
listener.onFragment1();
}
});
return view;
}
public interface ActionListener{
void onFragment1();
}
}
点击按钮即可执行
Fragment someFragment = new SomeFragment();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container,someFragment );
// give your fragment container id in first parameter
transaction.addToBackStack(null);
// if written,this transaction will be added to backstack
transaction.commit();
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