Java tutorial
/* * ************************************************************************* * Util.java * ************************************************************************** * Copyright 2015 VLC authors and VideoLAN * Author: Geoffrey Mtais * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. * *************************************************************************** */ package org.videolan.vlc.gui.helpers; import android.app.Activity; import android.content.Context; import android.content.SharedPreferences; import android.content.res.TypedArray; import android.databinding.BindingAdapter; import android.os.Handler; import android.os.Looper; import android.preference.PreferenceManager; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.design.widget.Snackbar; import android.support.v4.content.ContextCompat; import android.text.Html; import android.text.TextUtils; import android.util.DisplayMetrics; import android.util.TypedValue; import android.view.View; import android.view.animation.Animation; import android.view.animation.AnimationSet; import android.view.animation.DecelerateInterpolator; import android.view.animation.RotateAnimation; import android.view.inputmethod.InputMethodManager; import android.widget.ImageView; import android.widget.TextView; import org.videolan.vlc.BuildConfig; import org.videolan.vlc.R; import org.videolan.vlc.VLCApplication; import java.util.concurrent.atomic.AtomicInteger; public class UiTools { public static final int ITEM_FOCUS_ON = ContextCompat.getColor(VLCApplication.getAppContext(), R.color.orange500); public static final int ITEM_FOCUS_OFF = ContextCompat.getColor(VLCApplication.getAppContext(), R.color.transparent); private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); private static final Handler sHandler = new Handler(Looper.getMainLooper()); public static final int DELETE_DURATION = 3000; /** Print an on-screen message to alert the user */ public static void snacker(@NonNull View view, @NonNull int stringId) { Snackbar.make(view, stringId, Snackbar.LENGTH_SHORT).show(); } /** Print an on-screen message to alert the user */ public static void snacker(@NonNull View view, @NonNull String message) { Snackbar.make(view, message, Snackbar.LENGTH_SHORT).show(); } /** Print an on-screen message to alert the user, with undo action */ public static void snackerWithCancel(@NonNull View view, @NonNull String message, @NonNull final Runnable action) { snackerWithCancel(view, message, action, null); } /** Print an on-screen message to alert the user, with undo action */ public static void snackerWithCancel(@NonNull View view, @NonNull String message, @NonNull final Runnable action, @Nullable final Runnable cancelAction) { Snackbar.make(view, message, DELETE_DURATION) .setAction(android.R.string.cancel, new View.OnClickListener() { @Override public void onClick(View v) { if (action != null) sHandler.removeCallbacks(action); if (cancelAction != null) cancelAction.run(); } }).show(); if (action != null) sHandler.postDelayed(action, DELETE_DURATION); } public static int convertPxToDp(int px) { DisplayMetrics metrics = VLCApplication.getAppResources().getDisplayMetrics(); float logicalDensity = metrics.density; int dp = Math.round(px / logicalDensity); return dp; } public static int convertDpToPx(int dp) { return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, VLCApplication.getAppResources().getDisplayMetrics())); } /** * Get a resource id from an attribute id. * @param context * @param attrId * @return the resource id */ public static int getResourceFromAttribute(Context context, int attrId) { TypedArray a = context.getTheme().obtainStyledAttributes(new int[] { attrId }); int resId = a.getResourceId(0, 0); a.recycle(); return resId; } /** * Get a color id from an attribute id. * @param context * @param attrId * @return the color id */ public static int getColorFromAttribute(Context context, int attrId) { return VLCApplication.getAppResources().getColor(getResourceFromAttribute(context, attrId)); } /** * Set the alignment mode of the specified TextView with the desired align * mode from preferences. * * See @array/audio_title_alignment_values * * @param alignMode Align mode as read from preferences * @param t Reference to the textview */ @BindingAdapter({ "alignMode" }) public static void setAlignModeByPref(TextView t, int alignMode) { switch (alignMode) { case 0: break; case 1: t.setEllipsize(TextUtils.TruncateAt.END); break; case 2: t.setEllipsize(TextUtils.TruncateAt.START); break; case 3: t.setEllipsize(TextUtils.TruncateAt.MARQUEE); t.setMarqueeRepeatLimit(-1); t.setSelected(true); break; } } /** * Generate a value suitable for use in {@link #setId(int)}. * This value will not collide with ID values generated at build time by aapt for R.id. * * @return a generated ID value */ public static int generateViewId() { for (;;) { final int result = sNextGeneratedId.get(); // aapt-generated IDs have the high byte nonzero; clamp to the range under that. int newValue = result + 1; if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. if (sNextGeneratedId.compareAndSet(result, newValue)) { return result; } } } public static void setViewVisibility(View v, int visibility) { if (v != null) v.setVisibility(visibility); } public static boolean isBlackThemeEnabled() { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(VLCApplication.getAppContext()); return pref.getBoolean("enable_black_theme", false); } public static void fillAboutView(View v) { TextView link = (TextView) v.findViewById(R.id.main_link); link.setText(Html.fromHtml(VLCApplication.getAppResources().getString(R.string.about_link))); String revision = VLCApplication.getAppResources().getString(R.string.build_revision) + " VLC: " + VLCApplication.getAppResources().getString(R.string.build_vlc_revision); String builddate = VLCApplication.getAppResources().getString(R.string.build_time); String builder = VLCApplication.getAppResources().getString(R.string.build_host); TextView compiled = (TextView) v.findViewById(R.id.main_compiled); compiled.setText(builder + " (" + builddate + ")"); TextView textview_rev = (TextView) v.findViewById(R.id.main_revision); textview_rev.setText(VLCApplication.getAppResources().getString(R.string.revision) + " " + revision + " (" + builddate + ") " + BuildConfig.FLAVOR_abi); final ImageView logo = (ImageView) v.findViewById(R.id.logo); logo.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { AnimationSet anim = new AnimationSet(true); RotateAnimation rotate = new RotateAnimation(0f, 360f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); rotate.setDuration(800); rotate.setInterpolator(new DecelerateInterpolator()); anim.addAnimation(rotate); logo.startAnimation(anim); } }); } public static void setKeyboardVisibility(final View v, final boolean show) { final InputMethodManager inputMethodManager = (InputMethodManager) VLCApplication.getAppContext() .getSystemService(Activity.INPUT_METHOD_SERVICE); sHandler.post(new Runnable() { @Override public void run() { if (show) inputMethodManager.showSoftInput(v, InputMethodManager.SHOW_FORCED); else inputMethodManager.hideSoftInputFromWindow(v.getWindowToken(), 0); } }); } }