Java tutorial
/* * Copyright 2013 serso aka se.solovyev * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * Contact details * * Email: se.solovyev@gmail.com * Site: http://se.solovyev.org */ package org.solovyev.android.calculator.wizard; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.view.View; import android.widget.Button; import org.solovyev.android.calculator.R; import javax.annotation.Nonnull; import static android.view.View.GONE; import static android.view.View.VISIBLE; import static org.solovyev.android.calculator.wizard.Wizards.FLOW; import static org.solovyev.android.calculator.wizard.Wizards.STEP; /** * User: serso * Date: 6/16/13 * Time: 9:07 PM */ public final class CalculatorWizardActivity extends FragmentActivity { /* ********************************************************************** * * FIELDS * ********************************************************************** */ private WizardStep step; private WizardFlow flow; /* ********************************************************************** * * VIEWS * ********************************************************************** */ private View prevButton; private Button nextButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.cpp_wizard); prevButton = findViewById(R.id.wizard_prev_button); nextButton = (Button) findViewById(R.id.wizard_next_button); String wizardName = getIntent().getStringExtra(FLOW); String stepName = getIntent().getStringExtra(STEP); if (savedInstanceState != null) { wizardName = savedInstanceState.getString(FLOW); stepName = savedInstanceState.getString(STEP); } flow = Wizards.getWizardFlow(wizardName != null ? wizardName : Wizards.FIRST_TIME_WIZARD); WizardStep step = null; if (stepName != null) { step = flow.getStep(stepName); } if (step == null) { step = flow.getFirstStep(); } setStep(step); } void setStep(@Nonnull WizardStep step) { if (this.step == null || !this.step.equals(step)) { hideFragment(); this.step = step; showFragment(); initTitle(); initNextButton(); initPrevButton(); } } private void initTitle() { setTitle(step.getTitleResId()); } private void initPrevButton() { final WizardStep prevStep = flow.getPrevStep(step); if (prevStep == null) { prevButton.setVisibility(GONE); prevButton.setOnClickListener(null); } else { prevButton.setVisibility(VISIBLE); prevButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (tryGoPrev()) { setStep(prevStep); } } }); } } private void initNextButton() { final WizardStep nextStep = flow.getNextStep(step); if (nextStep == null) { nextButton.setText(R.string.cpp_wizard_finish); nextButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (tryGoNext()) { finishFlow(); } } }); } else { nextButton.setText(step.getNextButtonTitleResId()); nextButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (tryGoNext()) { setStep(nextStep); } } }); } } void finishFlow() { finishFlow(false); } void finishFlow(boolean forceFinish) { if (flow != null && step != null) { Wizards.saveWizardFinished(flow, step, forceFinish); } finish(); } private boolean tryGoPrev() { if (this.step == null) { return true; } else { final Fragment fragment = getSupportFragmentManager().findFragmentByTag(this.step.getFragmentTag()); if (fragment != null) { return this.step.onPrev(fragment); } else { return true; } } } private boolean tryGoNext() { if (this.step == null) { return true; } else { final Fragment fragment = getSupportFragmentManager().findFragmentByTag(this.step.getFragmentTag()); if (fragment != null) { return this.step.onNext(fragment); } else { return true; } } } @Nonnull private Fragment showFragment() { final FragmentManager fm = getSupportFragmentManager(); final FragmentTransaction ft = fm.beginTransaction(); Fragment newFragment = fm.findFragmentByTag(this.step.getFragmentTag()); if (newFragment == null) { newFragment = Fragment.instantiate(this, this.step.getFragmentClass().getName(), this.step.getFragmentArgs()); ft.add(R.id.wizard_content, newFragment, this.step.getFragmentTag()); } ft.commit(); fm.executePendingTransactions(); return newFragment; } private void hideFragment() { final FragmentManager fm = getSupportFragmentManager(); final FragmentTransaction ft = fm.beginTransaction(); if (this.step != null) { hideFragmentByTag(fm, ft, this.step.getFragmentTag()); } ft.commit(); fm.executePendingTransactions(); } private void hideFragmentByTag(@Nonnull FragmentManager fm, @Nonnull FragmentTransaction ft, @Nonnull String fragmentTag) { final Fragment oldFragment = fm.findFragmentByTag(fragmentTag); if (oldFragment != null) { ft.remove(oldFragment); } } @Override protected void onSaveInstanceState(Bundle out) { super.onSaveInstanceState(out); out.putString(FLOW, flow.getName()); out.putString(STEP, step.getName()); } @Override protected void onPause() { super.onPause(); if (flow != null && step != null) { Wizards.saveLastWizardStep(flow, step); } } @Override public void onBackPressed() { FinishWizardConfirmationDialog.show(this); } WizardStep getStep() { return step; } WizardFlow getFlow() { return flow; } View getPrevButton() { return prevButton; } View getNextButton() { return nextButton; } /* ********************************************************************** * * STATIC/INNER * ********************************************************************** */ public static void startWizard(@Nonnull String name, @Nonnull Context context) { context.startActivity(createLaunchIntent(name, context)); } public static void continueWizard(@Nonnull String name, @Nonnull Context context) { final Intent intent = createLaunchIntent(name, context); final String step = Wizards.getLastSavedWizardStepName(name); if (step != null) { intent.putExtra(STEP, step); } context.startActivity(intent); } @Nonnull private static Intent createLaunchIntent(@Nonnull String name, @Nonnull Context context) { final Intent intent = new Intent(context, CalculatorWizardActivity.class); intent.putExtra(FLOW, name); intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); return intent; } }