Java tutorial
/* MD Chess - An Android chess program. Copyright (C) 2011-2012 Peter sterlund, peterosterlund2@gmail.com 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 3 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, see <http://www.gnu.org/licenses/>. */ package org.mdc.chess; import android.app.AlertDialog; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.content.SharedPreferences; import android.content.res.TypedArray; import android.graphics.Typeface; import android.preference.Preference; import android.preference.PreferenceManager; import android.support.v4.widget.TextViewCompat; import android.util.AttributeSet; import android.view.Gravity; import android.view.KeyEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnKeyListener; import android.view.ViewGroup; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.SeekBar; import android.widget.SeekBar.OnSeekBarChangeListener; import android.widget.TextView; import android.widget.Toast; import java.util.Locale; /** Lets user enter a percentage value using a seek bar. */ public class SeekBarPreference extends Preference implements OnSeekBarChangeListener { private final static int maxValue = 1000; private final static int DEFAULT_VALUE = 1000; private int currVal = DEFAULT_VALUE; private TextView currValBox; private boolean showStrengthHint = true; public SeekBarPreference(Context context) { super(context); } public SeekBarPreference(Context context, AttributeSet attrs) { super(context, attrs); } public SeekBarPreference(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } @Override protected View onCreateView(ViewGroup parent) { TextView name = new TextView(getContext()); name.setText(getTitle()); //name.setTextAppearance(getContext(), android.R.style.TextAppearance_Large); TextViewCompat.setTextAppearance(name, android.R.style.TextAppearance_Large); name.setGravity(Gravity.START); LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); lp.gravity = Gravity.START; lp.weight = 1.0f; name.setLayoutParams(lp); currValBox = new TextView(getContext()); currValBox.setTextSize(12); currValBox.setTypeface(Typeface.MONOSPACE, Typeface.ITALIC); currValBox.setPadding(2, 5, 0, 0); currValBox.setText(valToString()); lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); lp.gravity = Gravity.CENTER; currValBox.setLayoutParams(lp); LinearLayout row1 = new LinearLayout(getContext()); row1.setOrientation(LinearLayout.HORIZONTAL); row1.addView(name); row1.addView(currValBox); final SeekBar bar = new SeekBar(getContext()); bar.setMax(maxValue); bar.setProgress(currVal); bar.setOnSeekBarChangeListener(this); lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); lp.gravity = Gravity.END; bar.setLayoutParams(lp); CharSequence summaryCharSeq = getSummary(); boolean haveSummary = (summaryCharSeq != null) && (summaryCharSeq.length() > 0); TextView summary = null; if (haveSummary) { summary = new TextView(getContext()); summary.setText(getSummary()); // summary.setTextAppearance(getContext(), android.R.style.TextAppearance_Large); summary.setGravity(Gravity.START); lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); lp.gravity = Gravity.START; lp.weight = 1.0f; summary.setLayoutParams(lp); } LinearLayout layout = new LinearLayout(getContext()); layout.setPadding(25, 5, 25, 5); layout.setOrientation(LinearLayout.VERTICAL); layout.addView(row1); layout.addView(bar); if (summary != null) { layout.addView(summary); } layout.setId(android.R.id.widget_frame); currValBox.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { View content = View.inflate(SeekBarPreference.this.getContext(), R.layout.select_percentage, null); final AlertDialog.Builder builder = new AlertDialog.Builder(SeekBarPreference.this.getContext()); builder.setView(content); String title = ""; String key = getKey(); if (key.equals("strength")) { title = getContext().getString(R.string.edit_strength); } else if (key.equals("bookRandom")) { title = getContext().getString(R.string.edit_randomization); } builder.setTitle(title); final EditText valueView = (EditText) content.findViewById(R.id.selpercentage_number); valueView.setText(currValBox.getText().toString().replaceAll("%", "").replaceAll(",", ".")); final Runnable selectValue = new Runnable() { public void run() { try { String txt = valueView.getText().toString(); int value = (int) (Double.parseDouble(txt) * 10 + 0.5); if (value < 0) value = 0; if (value > maxValue) value = maxValue; onProgressChanged(bar, value, false); } catch (NumberFormatException ignored) { } } }; valueView.setOnKeyListener(new OnKeyListener() { public boolean onKey(View v, int keyCode, KeyEvent event) { if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) { selectValue.run(); return true; } return false; } }); builder.setPositiveButton("Ok", new Dialog.OnClickListener() { public void onClick(DialogInterface dialog, int which) { selectValue.run(); } }); builder.setNegativeButton("Cancel", null); builder.create().show(); } }); return layout; } private String valToString() { return String.format(Locale.US, "%.1f%%", currVal * 0.1); } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { if (!callChangeListener(progress)) { if (currVal != seekBar.getProgress()) { seekBar.setProgress(currVal); } return; } if (progress != seekBar.getProgress()) { seekBar.setProgress(progress); } currVal = progress; currValBox.setText(valToString()); SharedPreferences.Editor editor = getEditor(); editor.putInt(getKey(), progress); editor.commit(); if ((progress == 0) && showStrengthHint) { SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(getContext()); String engine = settings.getString("engine", "stockfish"); if ("stockfish".equals(engine)) { showStrengthHint = false; if (getKey().equals("strength")) { Toast.makeText(getContext(), R.string.strength_cuckoo_hint, Toast.LENGTH_LONG).show(); } } } } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { notifyChanged(); } @Override protected Object onGetDefaultValue(TypedArray a, int index) { int defVal = a.getInt(index, DEFAULT_VALUE); if (defVal > maxValue) defVal = maxValue; if (defVal < 0) defVal = 0; return defVal; } @Override protected void onSetInitialValue(boolean restorePersistedValue, Object defaultValue) { int val = restorePersistedValue ? getPersistedInt(DEFAULT_VALUE) : (Integer) defaultValue; if (!restorePersistedValue) { persistInt(val); } currVal = val; } }