当我的活动重新开始时，我会得到彼此重叠的片段，新片段超过旧片段，并且只有最新片段是可编辑的
我的片段看起来像这样，请忽略所有不必要的代码，此刻的应用程序已经很大，很难将一件事与另一件事分开：
package cu.me.cuanto;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.Fragment;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class FragmentCambio extends Fragment {
View view;
EditText inputCUC,inputCUP;
TextView exchangeExplain,eraseText,exchangeText;
ImageView rotatingImage; //esta es la imagen que gira en el fragment
ImageView backShadow;
Animation rotate180,fabOpen,fabClose,rotateForward,rotateBackward,shadowIn,shadowOut;
FloatingActionButton exchangeFab,optionsFab,eraseFab;
int exchange=25;
float cuc,cup;
boolean isOptionsOpen=false;
public FragmentCambio(){
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
view=inflater.inflate(R.layout.fragment_cambio,container,false);
backShadow = view.findViewById(R.id.back_shadow_2);
backShadow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
animateFab();
}
});
inputCUC=view.findViewById(R.id.input_cuc);
inputCUP=view.findViewById(R.id.input_cup);
rotatingImage=view.findViewById(R.id.rotating_image);
exchangeExplain=view.findViewById(R.id.exchange_explain_into_cambio);
eraseText=view.findViewById(R.id.erase_text_exchange_frag);
exchangeText=view.findViewById(R.id.exchange_text_exchange_frag);
exchangeFab=view.findViewById(R.id.exchangeFab);
optionsFab=view.findViewById(R.id.optionsFab);
eraseFab=view.findViewById(R.id.eraseFab);
rotate180= AnimationUtils.loadAnimation(getContext(),R.anim.rotate_180);
fabOpen=AnimationUtils.loadAnimation(getContext(),R.anim.fab_open);
fabClose=AnimationUtils.loadAnimation(getContext(),R.anim.fab_close);
rotateForward=AnimationUtils.loadAnimation(getContext(),R.anim.rotate_forward);
rotateBackward=AnimationUtils.loadAnimation(getContext(),R.anim.rotate_backward);
shadowIn=AnimationUtils.loadAnimation(getContext(),R.anim.shadow_in);
shadowOut=AnimationUtils.loadAnimation(getContext(),R.anim.shadow_out);
inputCUP.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
rotatingImage.startAnimation(rotate180); //animación de el icono del centro indicando conversión en sentido contrario
}
});
inputCUC.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if(!inputCUC.getText().toString().equals("")){
cuc=Float.valueOf(inputCUC.getText().toString());
cup=cuc*exchange;
inputCUP.setText(String.format("%.2f",cuc*exchange));
}
}
});
optionsFab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
animateFab();
}
});
eraseFab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
inputCUP.setText("");
inputCUC.setText("");
cuc=0;
cup=0;
animateFab();
}
});
exchangeFab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (exchange){
case 25:
exchange=24;
exchangeFab.setImageResource(R.drawable.custom24);
exchangeExplain.setText(String.format("Utilizando un cambio de %.0f:1",(float) exchange));
break;
case 24:
exchange=23;
exchangeFab.setImageResource(R.drawable.custom23);
exchangeExplain.setText(String.format("Utilizando un cambio de %.0f:1",(float) exchange));
break;
case 23:
exchange=25;
exchangeFab.setImageResource(R.drawable.custom25);
exchangeExplain.setText(String.format("Utilizando un cambio de %.0f:1",(float) exchange));
break;
default:
break;
}
//to be sure that CUC view is focused
if(inputCUC.hasFocus()){
inputCUP.setText(String.format("%.2f",cuc*exchange));
}
else if(inputCUP.hasFocus()){
Toast.makeText(getContext(),R.string.exchange_change_not_possible,Toast.LENGTH_SHORT).show();
animateFab();
}
if(inputCUC.getText().toString().equals("")){
inputCUP.setText("");
}
}
});
inputCUP.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if(inputCUP.isFocused()){
if(!s.toString().equals("")){
cup=Float.valueOf(s.toString());
cuc=cup/25;
inputCUC.setText(String.format("%.2f",cup/25));
}
else
inputCUC.setText("");
}
}
@Override
public void afterTextChanged(Editable s) {
}
});
inputCUC.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if(inputCUC.isFocused()){
if(!s.toString().equals("")){
cuc=Float.valueOf(s.toString());
cup=cuc*exchange;
inputCUP.setText(String.format("%.2f",cuc*exchange));
}
else
inputCUP.setText("");
}
}
@Override
public void afterTextChanged(Editable s) {
}
});
rotatingImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(inputCUC.isFocused()){
inputCUP.requestFocus();
}
else if(inputCUP.isFocused()){
inputCUC.requestFocus();
}
}
});
return view;
}
void animateFab(){
if(!isOptionsOpen){
optionsFab.startAnimation(rotateForward);
eraseFab.startAnimation(fabOpen);
eraseFab.setClickable(true);
eraseText.setVisibility(View.VISIBLE);
exchangeFab.startAnimation(fabOpen);
exchangeFab.setClickable(true);
exchangeText.setVisibility(View.VISIBLE);
backShadow.startAnimation(shadowIn);
backShadow.setVisibility(View.VISIBLE);
backShadow.setClickable(true);
isOptionsOpen=!isOptionsOpen;
}
else {
optionsFab.startAnimation(rotateBackward);
eraseFab.startAnimation(fabClose);
eraseFab.setClickable(false);
eraseText.setVisibility(View.INVISIBLE);
exchangeFab.startAnimation(fabClose);
exchangeFab.setClickable(false);
exchangeText.setVisibility(View.INVISIBLE);
backShadow.startAnimation(shadowOut);
backShadow.setVisibility(View.INVISIBLE);
backShadow.setClickable(false);
isOptionsOpen=!isOptionsOpen;
}
}
}
我相信问题是，当活动重新启动时，将再次调用onCreateView方法，因此将创建一个新视图而不会擦除旧视图。问题很烦人，因为在屏幕旋转时会创建新视图，我已经解决了强制肖像的问题，但这并不是真正的解决方案，至少不是一个优雅的解决方案。
活动中：
package cu.me.cuanto;
import android.Manifest;
import android.app.Dialog;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Handler;
import android.support.design.widget.NavigationView;
import android.support.v4.app.ActivityCompat;
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.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.FrameLayout;
import android.widget.TextView;
public class ActivityMain extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, FragmentHome.FragmentHomeListener {
//Variable Definitions
FragmentTransaction mFragmentTransaction,mDelayedFragmentTransaction;
Animation slideIn,slideOut,fullSlideIn;
FrameLayout homeFragmentContainer,conteoFragmentContainer,exchangeFragmentContainer,debtsFragmentContainer;
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mToggle;
NavigationView mNavigationView;
//Other elements like fragments and some other stuff
FragmentHome home = new FragmentHome();
FragmentConteo conteo = new FragmentConteo();
FragmentCambio cambio = new FragmentCambio();
FragmentRecargas deudas = new FragmentRecargas();
@Override
protected void onCreate(Bundle savedInstanceState) {
//Return app to default theme for avoid keep using the one set in manifest
setTheme(R.style.AppTheme);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(!allPermissionsGranted()){
final Dialog grantPermissions = new Dialog(ActivityMain.this);
grantPermissions.setContentView(R.layout.dialog_grant_permissions);
grantPermissions.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
TextView grantPermissionsButton = grantPermissions.findViewById(R.id.main_grant_permissions);
grantPermissionsButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
grantPhoneRelatedPermissions();
if(allPermissionsGranted()){
grantPermissions.dismiss();
}
}
});
grantPermissions.show();
}
//para el intercambio de fragments
slideIn= AnimationUtils.loadAnimation(getApplicationContext(),R.anim.slide_in);
slideOut= AnimationUtils.loadAnimation(getApplicationContext(),R.anim.slide_out);
fullSlideIn = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.full_slide_in);
homeFragmentContainer=findViewById(R.id.home_fragment_container);
conteoFragmentContainer=findViewById(R.id.conteo_fragment_container);
exchangeFragmentContainer=findViewById(R.id.exchange_fragment_container);
debtsFragmentContainer=findViewById(R.id.debts_fragment_container);
//para el navigation drawer y la hamburquesa
mDrawerLayout = findViewById(R.id.drawer_layout_id);
mToggle = new ActionBarDrawerToggle(this,mDrawerLayout,R.string.open,R.string.close);
mDrawerLayout.addDrawerListener(mToggle);
mToggle.syncState();
//Get no shadow under appBar
getSupportActionBar().setElevation(0);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mNavigationView = (NavigationView) findViewById(R.id.navigation_view);
mNavigationView.setNavigationItemSelectedListener(this);
//Declare FragmentTransactions and set their views
mFragmentTransaction = getSupportFragmentManager().beginTransaction();
mDelayedFragmentTransaction = getSupportFragmentManager().beginTransaction();
mFragmentTransaction.add(R.id.home_fragment_container,home,"Home Fragment");
mFragmentTransaction.commit();
//TODO: make this other shit after first shit
mDelayedFragmentTransaction.add(R.id.conteo_fragment_container,conteo,"Conteo Fragment");
mDelayedFragmentTransaction.add(R.id.exchange_fragment_container,cambio,"Exchange Fragment");
mDelayedFragmentTransaction.add(R.id.debts_fragment_container,deudas,"Debts Fragment");
mDelayedFragmentTransaction.commit();
//Select First item on the list
mNavigationView.setCheckedItem(R.id.home_fragment_selector);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(mToggle.onOptionsItemSelected(item)){
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(final MenuItem item) {
final int id = item.getItemId();
Runnable closeDrawerLayoutRunnable = new Runnable() {
@Override
public void run() {
mDrawerLayout.closeDrawer(GravityCompat.START);
}
};
Handler mHandler = new Handler();
switch (id){
case R.id.home_fragment_selector:
if(homeFragmentContainer.getVisibility()!=View.VISIBLE){
homeFragmentContainer.startAnimation(fullSlideIn);
homeFragmentContainer.setVisibility(View.VISIBLE);
conteoFragmentContainer.setVisibility(View.INVISIBLE);
exchangeFragmentContainer.setVisibility(View.INVISIBLE);
debtsFragmentContainer.setVisibility(View.INVISIBLE);
}
break;
case R.id.conteo_fragment_selector:
if(conteoFragmentContainer.getVisibility()!=View.VISIBLE){
conteoFragmentContainer.startAnimation(fullSlideIn);
conteoFragmentContainer.setVisibility(View.VISIBLE);
homeFragmentContainer.setVisibility(View.INVISIBLE);
exchangeFragmentContainer.setVisibility(View.INVISIBLE);
debtsFragmentContainer.setVisibility(View.INVISIBLE);
conteo.isOptionsOpen=false;
}
break;
case R.id.exchange_fragment_selector:
if(exchangeFragmentContainer.getVisibility()!=View.VISIBLE) {
exchangeFragmentContainer.startAnimation(fullSlideIn);
exchangeFragmentContainer.setVisibility(View.VISIBLE);
homeFragmentContainer.setVisibility(View.INVISIBLE);
conteoFragmentContainer.setVisibility(View.INVISIBLE);
debtsFragmentContainer.setVisibility(View.INVISIBLE);
cambio.isOptionsOpen = false;
}
break;
case R.id.debts_fragment_selector:
if(debtsFragmentContainer.getVisibility()!=View.VISIBLE){
debtsFragmentContainer.startAnimation(fullSlideIn);
debtsFragmentContainer.setVisibility(View.VISIBLE);
homeFragmentContainer.setVisibility(View.INVISIBLE);
conteoFragmentContainer.setVisibility(View.INVISIBLE);
exchangeFragmentContainer.setVisibility(View.INVISIBLE);
}
break;
case R.id.navigation_settings:
Intent settings = new Intent(getApplicationContext(), ActivitySettings.class);
startActivity(settings);
break;
case R.id.about_cuanto:
Intent about = new Intent(getApplicationContext(), ActivityAbout.class);
startActivity(about);
break;
default:
break;
}
mHandler.post(closeDrawerLayoutRunnable);
return true;
}
@Override
public void onBackPressed() {
// check if there are some FAB menu opened
if(cambio.isOptionsOpen){
cambio.animateFab();
cambio.isOptionsOpen=false;
}
else if(conteo.isOptionsOpen){
conteo.animateFab();
conteo.isOptionsOpen=false;
}
// this sequence works fine just because first is checked if there are FABs open, then the selected fragment
else if(homeFragmentContainer.getVisibility()!=View.VISIBLE){
homeFragmentContainer.setVisibility(View.VISIBLE);
mNavigationView.setCheckedItem(R.id.home_fragment_selector);
if(conteoFragmentContainer.getVisibility()==View.VISIBLE){
conteoFragmentContainer.startAnimation(slideOut);
conteoFragmentContainer.setVisibility(View.INVISIBLE);
}
else if(exchangeFragmentContainer.getVisibility()==View.VISIBLE){
exchangeFragmentContainer.startAnimation(slideOut);
exchangeFragmentContainer.setVisibility(View.INVISIBLE);
}
else if(debtsFragmentContainer.getVisibility()==View.VISIBLE){
debtsFragmentContainer.startAnimation(slideOut);
debtsFragmentContainer.setVisibility(View.INVISIBLE);
}
}
else{
super.onBackPressed();
}
}
//Custom interfaces implementation
@Override
public void onButtonListener(View view) {
if(view.getId()==R.id.conteo_card){
mNavigationView.setCheckedItem(R.id.conteo_fragment_selector);
conteoFragmentContainer.startAnimation(fullSlideIn);
conteoFragmentContainer.setVisibility(View.VISIBLE);
Handler mHandler = new Handler();
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
homeFragmentContainer.setVisibility(View.INVISIBLE);
exchangeFragmentContainer.setVisibility(View.INVISIBLE);
}
},300);
conteo.isOptionsOpen=false;
}
else if(view.getId()==R.id.cambio_card){
mNavigationView.setCheckedItem(R.id.exchange_fragment_selector);
exchangeFragmentContainer.startAnimation(fullSlideIn);
exchangeFragmentContainer.setVisibility(View.VISIBLE);
Handler mHandler = new Handler();
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
homeFragmentContainer.setVisibility(View.INVISIBLE);
conteoFragmentContainer.setVisibility(View.INVISIBLE);
}
},300);
cambio.isOptionsOpen=false;
}
else if(view.getId()==R.id.debts_card){
mNavigationView.setCheckedItem(R.id.debts_fragment_selector);
debtsFragmentContainer.startAnimation(fullSlideIn);
debtsFragmentContainer.setVisibility(View.VISIBLE);
Handler mHandler = new Handler();
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
homeFragmentContainer.setVisibility(View.INVISIBLE);
conteoFragmentContainer.setVisibility(View.INVISIBLE);
}
},300);
}
}
//My own Functions
private void grantPhoneRelatedPermissions(){
if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED || ActivityCompat.checkSelfPermission(getApplicationContext(),Manifest.permission.READ_PHONE_STATE)!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(ActivityMain.this,new String[]{Manifest.permission.CALL_PHONE,Manifest.permission.READ_PHONE_STATE},1);
return;
}
}
private boolean allPermissionsGranted(){
if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CALL_PHONE) == PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(getApplicationContext(),Manifest.permission.READ_PHONE_STATE)== PackageManager.PERMISSION_GRANTED){
return true;
}
else
return false;
}
}
if (savedInstanceState == null) {
// Create new instances if the savedInstanceState == null
home = new FragmentHome();
conteo = new FragmentConteo();
cambio = new FragmentCambio();
deudas = new FragmentRecargas();
//Declare FragmentTransactions and set their views
mFragmentTransaction = getSupportFragmentManager().beginTransaction();
mDelayedFragmentTransaction = getSupportFragmentManager().beginTransaction();
mFragmentTransaction.add(R.id.home_fragment_container,home,"Home Fragment");
mFragmentTransaction.commit();
//TODO: make this other shit after first shit
mDelayedFragmentTransaction.add(R.id.conteo_fragment_container,conteo,"Conteo Fragment");
mDelayedFragmentTransaction.add(R.id.exchange_fragment_container,cambio,"Exchange Fragment");
mDelayedFragmentTransaction.add(R.id.debts_fragment_container,deudas,"Debts Fragment");
mDelayedFragmentTransaction.commit();
} else {
// Get the already existing Fragments out of FragmentManager
home = (FragmentHome) getSupportFragmentManager().findFragmentById(R.id.home_fragment_container);
conteo = (FragmentConteo) getSupportFragmentManager().findFragmentById(R.id.conteo_fragment_container);
cambio = (FragmentCambio) getSupportFragmentManager().findFragmentById(R.id.exchange_fragment_container);
deudas = (FragmentRecargas) getSupportFragmentManager().findFragmentById(R.id.debts_fragment_container);
}
您会注意到，当保存的实例状态为
not null时，我们将从FragmentManager获取已经存在的片段实例，而不是创建一个新实例。