Java tutorial
/* * Copyright 2014 Heinrich Reimer Software * * 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. */ package com.heinrichreimersoftware.singleinputform; import android.content.Context; import android.content.res.TypedArray; import android.graphics.PorterDuff; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v7.app.ActionBarActivity; import android.support.v7.widget.CardView; import android.view.View; import android.view.animation.AccelerateInterpolator; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.view.animation.DecelerateInterpolator; import android.view.animation.Interpolator; import android.view.inputmethod.InputMethodManager; import android.widget.ImageButton; import android.widget.ProgressBar; import android.widget.ScrollView; import android.widget.TextSwitcher; import android.widget.TextView; import android.widget.ViewAnimator; import android.widget.ViewSwitcher; import com.heinrichreimersoftware.singleinputform.steps.Step; import com.nineoldandroids.animation.ObjectAnimator; import com.nineoldandroids.util.Property; import java.util.ArrayList; import java.util.List; public abstract class SingleInputFormActivity extends ActionBarActivity { private static final String KEY_DATA = "key_data"; private static final String KEY_STEP_INDEX = "key_step_index"; private Property<ProgressBar, Integer> PB_PROGRESS_PROPERTY = new Property<ProgressBar, Integer>(Integer.class, "PB_PROGRESS_PROPERTY") { @Override public void set(ProgressBar pb, Integer value) { pb.setProgress(value); setProgressDrawable(); } @Override public Integer get(ProgressBar pb) { return pb.getProgress(); } }; private static List<Step> sSteps = new ArrayList<Step>(); private FragmentActivity activity = this; private Bundle setupData = new Bundle(); private int mStepIndex = 0; private boolean mErrored; private ScrollView mContainerScrollView; private TextSwitcher mTitleSwitcher; private TextSwitcher mErrorSwitcher; private TextSwitcher mDetailsSwitcher; private CardView mTextField; private ViewAnimator mInputSwitcher; private ImageButton mNextButton; private ProgressBar mProgressbar; private TextView mStepText; private View.OnClickListener mOnNextButtonClickListener = new View.OnClickListener() { @Override public void onClick(View v) { nextStep(); } }; private Drawable mButtonNextIcon; private Drawable mButtonFinishIcon; private int mTextFieldBackgroundColor = -1; private int mProgressBackgroundColor = -1; private int mTitleTextColor = -1; private int mDetailsTextColor = -1; private int mErrorTextColor = -1; @Override public void onBackPressed() { if (mStepIndex == 0) { finish(); } else { previousStep(); } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_single_input_form); loadTheme(); sSteps = getSteps(this); findViews(); if (savedInstanceState != null) { setupData = savedInstanceState.getBundle(KEY_DATA); mStepIndex = savedInstanceState.getInt(KEY_STEP_INDEX, 0); } setupTitle(); setupInput(); setupError(); setupDetails(); mNextButton.setOnClickListener(mOnNextButtonClickListener); mErrorSwitcher.setText(""); updateStep(); } @Override public void onRestoreInstanceState(Bundle savedInstanceState) { super.onSaveInstanceState(savedInstanceState); if (savedInstanceState != null) { setupData = savedInstanceState.getBundle(KEY_DATA); mStepIndex = savedInstanceState.getInt(KEY_STEP_INDEX, 0); } } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); setupData = getCurrentStep().save(setupData); outState.putBundle(KEY_DATA, setupData); outState.putInt(KEY_STEP_INDEX, mStepIndex); } @Override protected void onPause() { hideSoftInput(); super.onPause(); } protected abstract List<Step> getSteps(Context context); private void findViews() { mContainerScrollView = (ScrollView) findViewById(R.id.container_scroll_view); mTitleSwitcher = (TextSwitcher) findViewById(R.id.title_switcher); mErrorSwitcher = (TextSwitcher) findViewById(R.id.error_switcher); mDetailsSwitcher = (TextSwitcher) findViewById(R.id.details_switcher); mTextField = (CardView) findViewById(R.id.text_field); mInputSwitcher = (ViewAnimator) findViewById(R.id.input_switcher); mNextButton = (ImageButton) findViewById(R.id.next_button); mProgressbar = (ProgressBar) findViewById(R.id.progressbar); mStepText = (TextView) findViewById(R.id.step_text); } protected Step getCurrentStep() { return getStep(mStepIndex); } protected Step getStep(int position) { Step step = sSteps.get(position); step.setContext(this); return step; } private void loadTheme() { /* Default values */ mButtonNextIcon = getResources().getDrawable(R.drawable.ic_action_next_item); mButtonFinishIcon = getResources().getDrawable(R.drawable.ic_action_accept); /* Custom values */ int[] attrs = { R.attr.colorPrimary, R.attr.colorPrimaryDark, android.R.attr.textColorPrimary, android.R.attr.textColorSecondary, R.attr.sifNextIcon, R.attr.sifFinishIcon }; TypedArray array = obtainStyledAttributes(attrs); mTextFieldBackgroundColor = array.getColor(0, 0); mProgressBackgroundColor = array.getColor(1, 0); mTitleTextColor = mErrorTextColor = array.getColor(2, 0); mDetailsTextColor = array.getColor(3, 0); Drawable buttonNextIcon = array.getDrawable(4); if (buttonNextIcon != null) { mButtonNextIcon = buttonNextIcon; } Drawable buttonFinishIcon = array.getDrawable(5); if (buttonFinishIcon != null) { mButtonFinishIcon = buttonFinishIcon; } array.recycle(); } private Animation getAnimation(int animationResId, boolean isInAnimation) { final Interpolator interpolator; if (isInAnimation) { interpolator = new DecelerateInterpolator(1.0f); } else { interpolator = new AccelerateInterpolator(1.0f); } Animation animation = AnimationUtils.loadAnimation(activity, animationResId); animation.setInterpolator(interpolator); return animation; } private void setupTitle() { mTitleSwitcher.setInAnimation(getAnimation(R.anim.slide_in_to_bottom, true)); mTitleSwitcher.setOutAnimation(getAnimation(R.anim.slide_out_to_top, false)); mTitleSwitcher.setFactory(new ViewSwitcher.ViewFactory() { @Override public View makeView() { TextView view = (TextView) activity.getLayoutInflater().inflate(R.layout.view_title, null); if (view != null) { view.setTextColor(mTitleTextColor); } return view; } }); mTitleSwitcher.setText(""); } private void setupInput() { mInputSwitcher.setInAnimation(getAnimation(R.anim.alpha_in, true)); mInputSwitcher.setOutAnimation(getAnimation(R.anim.alpha_out, false)); mInputSwitcher.removeAllViews(); for (int i = 0; i < stepsSize(); i++) { mInputSwitcher.addView(getStep(i).getView()); } } private void setupError() { mErrorSwitcher.setInAnimation(getAnimation(android.R.anim.slide_in_left, true)); mErrorSwitcher.setOutAnimation(getAnimation(android.R.anim.slide_out_right, false)); mErrorSwitcher.setFactory(new ViewSwitcher.ViewFactory() { @Override public View makeView() { TextView view = (TextView) activity.getLayoutInflater().inflate(R.layout.view_error, null); if (view != null && mErrorTextColor != -1) { view.setTextColor(mErrorTextColor); } return view; } }); mErrorSwitcher.setText(""); } private void setupDetails() { mDetailsSwitcher.setInAnimation(getAnimation(R.anim.alpha_in, true)); mDetailsSwitcher.setOutAnimation(getAnimation(R.anim.alpha_out, false)); mDetailsSwitcher.setFactory(new ViewSwitcher.ViewFactory() { @Override public View makeView() { TextView view = (TextView) activity.getLayoutInflater().inflate(R.layout.view_details, null); if (view != null && mDetailsTextColor != -1) { view.setTextColor(mDetailsTextColor); } return view; } }); mDetailsSwitcher.setText(""); } private void updateStep() { if (mStepIndex >= stepsSize()) { hideSoftInput(); onFormFinished(setupData); finish(); return; } updateViews(); mContainerScrollView.smoothScrollTo(0, 0); } private int stepsSize() { return sSteps.size(); } private void hideSoftInput() { InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE); View v = getCurrentFocus(); if (v == null) return; imm.hideSoftInputFromWindow(v.getWindowToken(), 0); } protected abstract void onFormFinished(Bundle data); private void updateViews() { Step step = getCurrentStep(); if (mStepIndex + 1 >= stepsSize()) { mNextButton.setImageDrawable(mButtonFinishIcon); step.updateView(true); } else { mNextButton.setImageDrawable(mButtonNextIcon); step.updateView(false); } step.restore(setupData); setTextFieldBackgroundDrawable(); mInputSwitcher.setDisplayedChild(mStepIndex); mErrorSwitcher.setText(""); mDetailsSwitcher.setText(step.getDetails()); mTitleSwitcher.setText(step.getTitle()); mStepText.setText(getString(R.string.page_number, mStepIndex + 1, stepsSize())); mStepText.setTextColor(mDetailsTextColor); updateProgressbar(); } private void setTextFieldBackgroundDrawable() { if (mTextFieldBackgroundColor != -1) { mTextField.setCardBackgroundColor(mTextFieldBackgroundColor); } } private void setProgressDrawable() { if (mProgressBackgroundColor != -1) { Drawable progressDrawable = mProgressbar.getProgressDrawable(); if (progressDrawable != null) { progressDrawable.setColorFilter(mProgressBackgroundColor, PorterDuff.Mode.SRC_IN); } } } private void updateProgressbar() { mProgressbar.setMax(stepsSize() * 100); ObjectAnimator.ofInt(mProgressbar, PB_PROGRESS_PROPERTY, mStepIndex * 100).start(); } protected void previousStep() { setupData = getCurrentStep().save(setupData); mStepIndex--; updateStep(); } protected void nextStep() { Step step = getCurrentStep(); boolean checkStep = checkStep(); if (!checkStep) { if (!mErrored) { mErrored = true; mErrorSwitcher.setText(step.getError()); } } else { mErrored = false; } if (mErrored) { return; } setupData = step.save(setupData); mStepIndex++; updateStep(); } private boolean checkStep() { return getCurrentStep().check(); } }