Java tutorial
package dcheungaa.procal; import android.Manifest; import android.app.Activity; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.pm.PackageManager; import android.content.res.Resources; import android.graphics.Point; import android.graphics.Typeface; import android.net.Uri; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.design.widget.NavigationView; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.text.Html; import android.text.method.LinkMovementMethod; import android.view.Display; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.Window; import android.widget.HorizontalScrollView; import android.widget.LinearLayout; import android.widget.RelativeLayout; import android.widget.ScrollView; import android.widget.TextView; import com.google.android.gms.appindexing.Action; import com.google.android.gms.appindexing.AppIndex; import com.google.android.gms.appindexing.Thing; import com.google.android.gms.common.api.GoogleApiClient; import java.io.InputStream; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import dcheungaa.procal.Func.FuncItem; import dcheungaa.procal.History.HistoryActivity; import fx50.Fx50ParserCallable; public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener { /** * ATTENTION: This was auto-generated to implement the App Indexing API. * See https://g.co/AppIndexing/AndroidStudio for more information. */ private GoogleApiClient client; private boolean call_load = false; private KeyPad_init keyPad; private KeyPad_init varPad; private KeyPad_init cmdPad; private KeyPad_init constPad; public static Map<String, View> views = new HashMap<>(); //public static List <List<String>> vars = new ArrayList<>(); public static List<String> vars = new ArrayList<>(); public static Tokens tokens = new Tokens(); public static int fontWidth; public static int fontHeight; public static HorizontalScrollView horizontalScrollView; public static ScrollView verticalScrollView; public static List<CalcBtn> calcBtns = new ArrayList<>(); public static ScrollView svVar; public static ScrollView svCmd; public static ScrollView svConst; public static int screenWidth; public static int screenHeight; public static LinearLayout llKeyPad; public static Context context; public static Fx50ParserCallable fx50Parser; public List<FuncItem> funcItemList = new ArrayList<>(); public static boolean func_initialised = false; public static Thread fx50ParserThread; public static List<Activity> mainActivities = new ArrayList<>(); public static boolean FuncEditing = false; @Override protected void onCreate(Bundle savedInstanceState) { mainActivities.add(this); try { fx50Parser = new Fx50ParserCallable(); } catch (Exception e) { System.out.println("Fx50 Parser failed to initiate: " + e.getMessage()); } this.requestWindowFeature(Window.FEATURE_NO_TITLE); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); context = this; InputHandler.setContext(this); views.put("drawer", (DrawerLayout) findViewById(R.id.drawer_layout)); ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, ((DrawerLayout) views.get("drawer")), R.string.navigation_drawer_open, R.string.navigation_drawer_close); ((DrawerLayout) views.get("drawer")).setDrawerListener(toggle); toggle.syncState(); // //DrawerLayout.LayoutParams lp =(android.support.v4.widget.DrawerLayout.LayoutParams) drawer.getLayoutParams(); //lp.setMargins(0,200,0,200); //drawer.setLayoutParams(lp); NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); navigationView.setNavigationItemSelectedListener(this); views.put("resultDisplay", findViewById(R.id.resultDisplay)); //Set font TextView inquiryDisplay = (TextView) findViewById(R.id.inquiryDisplay); TextView matrixDisplay = (TextView) findViewById(R.id.matrixDisplay); views.put("matrixDisplay", matrixDisplay); views.put("inquiryDisplay", inquiryDisplay); final Typeface FONT_FX50 = Typeface.createFromAsset(getAssets(), "fonts/Fx50.otf"); matrixDisplay.setTypeface(FONT_FX50); TextView cursor = (TextView) findViewById(R.id.tv_cursor); views.put("cursor", (TextView) findViewById(R.id.tv_cursor)); cursor.setTypeface(FONT_FX50); //keypad gen final InputStream inSKey = getResources().openRawResource(R.raw.keypad); Display display = getWindowManager().getDefaultDisplay(); RelativeLayout cm = (RelativeLayout) findViewById(R.id.content_main); LinearLayout lls = (LinearLayout) findViewById(R.id.llScreen); llKeyPad = (LinearLayout) findViewById(R.id.llKeyPad); Resources resources = getResources(); keyPad = new KeyPad_init(this, resources, inSKey, display, cm, lls, llKeyPad); call_load = true; horizontalScrollView = (HorizontalScrollView) findViewById(R.id.llHoriScrollView); matrixDisplay.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { System.out.print("Pressed Boss\n"); if (event.getAction() == MotionEvent.ACTION_UP) { if (!CursorHandler.cursorVisible && DisplayModeHandler.displayMode) { CursorHandler.cursorVisible = true; CursorHandler.blinkCursor(); DisplayModeHandler.displayMode = false; InputHandler.updateMatrixDisplay(); } if (!InputHandler.error) CursorHandler.locateCursorPos((int) event.getX()); InputHandler.error = false; } return true; } }); CursorHandler.blinkCursor(); if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { if (!ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) { System.out.println("Requesting writing permission"); ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, 1234); } } if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { if (!ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.READ_EXTERNAL_STORAGE)) { System.out.println("Requesting reading permission"); ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.READ_EXTERNAL_STORAGE }, 1235); } } Point size = new Point(); display.getSize(size); screenWidth = size.x; screenHeight = size.y; //hide VAR keypad svVar = (ScrollView) findViewById(R.id.svVar); svVar.setVisibility(View.INVISIBLE); svVar.setPadding(0, 0, 0, 0); svVar.setBackgroundResource(R.drawable.popup_container); svVar.setElevation(16f); LinearLayout llVar = (LinearLayout) findViewById(R.id.llVarPad); llVar.setElevation(32f); llVar.setBackgroundColor(context.getResources().getColor(R.color.colorPrimaryDarker)); varPad = new KeyPad_init(this, resources, display, llVar); final InputStream inSCmd = getResources().openRawResource(R.raw.programming_keys); svCmd = (ScrollView) findViewById(R.id.svCmd); svCmd.setVisibility(View.INVISIBLE); svCmd.setPadding(0, 0, 0, 0); svCmd.setBackgroundResource(R.drawable.popup_container); svCmd.setElevation(16f); LinearLayout llCmd = (LinearLayout) findViewById(R.id.llCmdPad); llCmd.setElevation(32f); llCmd.setBackgroundColor(context.getResources().getColor(R.color.colorAccentDarker)); cmdPad = new KeyPad_init(this, resources, inSCmd, display, llCmd, "", "COMMAND"); final InputStream inSConst = getResources().openRawResource(R.raw.constant_keypad); svConst = (ScrollView) findViewById(R.id.svConst); svConst.setVisibility(View.INVISIBLE); svConst.setPadding(0, 0, 0, 0); svConst.setBackgroundResource(R.drawable.popup_container); svConst.setElevation(16f); LinearLayout llConst = (LinearLayout) findViewById(R.id.llConstPad); llConst.setElevation(32f); llConst.setBackgroundColor(context.getResources().getColor(R.color.colorSecondaryDarker)); constPad = new KeyPad_init(this, resources, inSConst, display, llConst, "&", "CONSTANT"); // ATTENTION: This was auto-generated to implement the App Indexing API. // See https://g.co/AppIndexing/AndroidStudio for more information. client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build(); } @Override public void onWindowFocusChanged(boolean hasFocus) { TextView cursor = (TextView) MainActivity.views.get("cursor"); TextView matrixDisplay = (TextView) MainActivity.views.get("matrixDisplay"); super.onWindowFocusChanged(hasFocus); if (call_load) { call_load = false; fontWidth = cursor.getWidth(); fontHeight = cursor.getHeight(); cursor.setText(Character.toString((char) 0x258E)); //cursor.setTop(matrixDisplay.getTop()); cursor.setPadding(matrixDisplay.getPaddingLeft(), cursor.getPaddingTop(), cursor.getPaddingRight(), cursor.getPaddingBottom()); cursor.setLeft(matrixDisplay.getLeft()); //CursorHandler.hideCursor(); RelativeLayout cm = (RelativeLayout) findViewById(R.id.content_main); LinearLayout rows = (LinearLayout) findViewById(R.id.llKeyPad); keyPad.KeyPad_resize(cm, rows); int fnBtnHeight = keyPad.btn_rows.get(0).get(0).get_mheight(); System.out.print(Integer.toString(fnBtnHeight)); varPad.resize(fnBtnHeight, fnBtnHeight * 3, svVar); cmdPad.resize(fnBtnHeight, fnBtnHeight * 3, svCmd); constPad.resize(fnBtnHeight, fnBtnHeight * 3, svConst); } } @Override public void onBackPressed() { DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); if (drawer.isDrawerOpen(GravityCompat.START)) { drawer.closeDrawer(GravityCompat.START); } else if (svVar.getVisibility() == View.VISIBLE) { InputHandler.hideDrawer(MainActivity.svVar); } else { super.onBackPressed(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } @SuppressWarnings("StatementWithEmptyBody") @Override @NonNull public boolean onNavigationItemSelected(MenuItem item) { // Handle navigation view item clicks here. switch (item.getItemId()) { case R.id.nav_history: Intent intent = new Intent(MainActivity.context, HistoryActivity.class); startActivity(intent); return true; case R.id.nav_about: String credits = "<p>This piece of software used the work <a href=\"https://arxiv.org/abs/0908.3030v1\">\"A Java Math.BigDecimal Implementation of Core Mathematical Functions\" of Richard J. Mathar</a>, which was made available under the LGPL3.0 license as a library. As part of the obligations to the license, if the user wish to replace this library with their own, they may contact: <a href=\"mailto:dcheungaa@connect.ust.hk\">dcheungaa@connect.ust.hk</a></p>\n" + "\n" + "<p>Other code libraries used:</p>\n" + "<p><a href=\"https://github.com/atorstling/bychan\">Bychan</a><br>\n" + "<a href=\"https://github.com/evant/gradle-retrolambda\">Gradle-Retrolambda</a><br>\n" + "<a href=\"https://github.com/streamsupport/streamsupport\">SteamSupport</a></p>\n"; final AlertDialog.Builder builder_add = new AlertDialog.Builder(MainActivity.this); builder_add.setTitle("About"); LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); LinearLayout aboutLayout = (LinearLayout) inflater.inflate(R.layout.about_alert, null); builder_add.setView(aboutLayout); TextView aboutTextView = (TextView) aboutLayout.findViewById(R.id.about_content); aboutTextView.setText(Html.fromHtml(credits)); aboutTextView.setMovementMethod(LinkMovementMethod.getInstance()); builder_add.setPositiveButton("Close", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { dialog.dismiss(); } }); AlertDialog alert_add = builder_add.create(); alert_add.show(); return true; } DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); drawer.closeDrawer(GravityCompat.START); return true; } /** * ATTENTION: This was auto-generated to implement the App Indexing API. * See https://g.co/AppIndexing/AndroidStudio for more information. */ public Action getIndexApiAction() { Thing object = new Thing.Builder().setName("Main Page") // TODO: Define a title for the content shown. // TODO: Make sure this auto-generated URL is correct. .setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]")).build(); return new Action.Builder(Action.TYPE_VIEW).setObject(object).setActionStatus(Action.STATUS_TYPE_COMPLETED) .build(); } @Override public void onStart() { super.onStart(); // ATTENTION: This was auto-generated to implement the App Indexing API. // See https://g.co/AppIndexing/AndroidStudio for more information. client.connect(); AppIndex.AppIndexApi.start(client, getIndexApiAction()); } @Override public void onStop() { super.onStop(); // ATTENTION: This was auto-generated to implement the App Indexing API. // See https://g.co/AppIndexing/AndroidStudio for more information. AppIndex.AppIndexApi.end(client, getIndexApiAction()); client.disconnect(); } public static void set_Cursor_Visibility(TextView c, int visible) { c.setVisibility(visible); } }