Show Menu

CSIS 3175 Mobile Cheat Sheet by

android

Decimal Format

DecimalFormat currency = new DecimalFormat("$###,###.##");
currency.format(totalCost));

Pass And Get Value Into/From Another Activity

Intent i = new Intent(MainActivity.this,
                                SecondActivity.class);
                        i.putExtra("data",totalCost);
                        startActivity(i);

Intent intent = getIntent();
Double value = itent.getDoubleExtra(Key,0);

Splash Activity

public class SplashActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);
        TimerTask task = new TimerTask() {
            @Override
            public void run() {
                finish();
                startActivity(new Intent(SplashActivity.this,
                        MainActivity.class));
            }
        };
        Timer t = new Timer();
        t.schedule(task,4000);
    }
}

Working with Files

FileOutputStream fout =
openFileOutput("File1.txt",MODE_APPEND);
fout.write(data.getBytes());
fout.write("\n".getBytes());
fout.close();
FileInputStream fin = openFileInput("File1.txt");
String temp = "";
int c;
char ch;
while((c=fin.read())!=-1){
ch = (char)c;
temp += Character.toString(ch);
}
output.setText(temp);
fin.close();

Calling DBHelper

//to view student records
/*Cursor c = dbh.viewData();
StringBuilder str = new StringBuilder();
if(c.getCount()>0){
while (c.moveToNext()){
str.append("ID : " +c.getString(0));
str.append(" First Name : " +c.getString(1));
str.append(" Last Name : "+c.getString(2));
str.append(" Cell number : "+ c.getString(3));
str.append(" prov Id : " + c.getString(4));
str.append("\n");
}
result.setText(str);

//Create Record
 boolean isAdded= db.addRec(fn.getText().toString(),ln.getText().toString(),
                        cn.getText().toString(),pi.getText().toString());

Database

public class DatabaseHelper extends SQLiteOpenHelper{
final static String DATABASE_NAME = "Information.db";
final static int DATABASE_VERSION = 4;

public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
//creating student_table and province_table
String query = "Create Table [TABLENAME] ( [COLUMN] INTEGER PRIMARY KEY ,COLUMN2 TEXT,...)";
//Only INTEGER, TEXT OR REAL
try{
db.execSQL(query);
}
catch (Exception e){
e.printStackTrace();
}
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("Drop table if exists " + TABLE1_NAME);
db.execSQL("Drop table if exists " + TABLE2_NAME);
onCreate(db);
}

//Add Record
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("Column",value);
long r = db.insert(TABLE1_NAME,null,values);
if(r == -1){
return false;
}
else{
return true;
}

//method to view data
public Cursor viewData(){
SQLiteDatabase db = this.getWritableDatabase();
String query = "Select * from " + TABLE1_NAME;
Cursor c = db.rawQuery(query,null);
return c;
}
 

Play Media

mpG = new MediaPlayer();
mpG = MediaPlayer.create(this,R.raw.ukulele);
mpD = new MediaPlayer();
mpD = MediaPlayer.create(this,R.raw.drums);
mpG.start();
mpG.pauset();

Shared Prefs

final SharedPreferences sharedPref =
                PreferenceManager.getDefaultSharedPreferences
                        (this);

button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                intYear = Integer.parseInt(years.getText().toString());
                decLoan = Float.parseFloat(loan.getText().toString());
                decInterest = Float.parseFloat(interest.getText().toString());
                SharedPreferences.Editor editor = sharedPref.edit();
                editor.putInt("key1",intYear);
                editor.putFloat("key2",decLoan);
                editor.putFloat("key3",decInterest);
                editor.commit();
                startActivity(new Intent
                        (MainActivity.this,Payment.class));
            }
        });


//Get the values
SharedPreferences sp = PreferenceManager.
                getDefaultSharedPreferences(this);

 int years = sp.getInt("key1",0);
 float loan = sp.getFloat("key2",0);
float interest = sp.getFloat("key3",0);

Working With Fragments

public class FragmentOne extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_fragment_one, container, false);
    }
//Main
public void clickOne(View view){
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        FragmentOne f1 = new FragmentOne();
        ft.add(R.id.rlFrag1,f1);
        ft.commit();
    }
//Add this to the layout
android:onClick="clickOne"
//Dont forget to change fragment layout to relative

Download the CSIS 3175 Mobile Cheat Sheet

3 Pages
//media.cheatography.com/storage/thumb/fabiobays_csis-3175-mobile.750.jpg

PDF (recommended)

Alternative Downloads

Share This Cheat Sheet!

 

Comments

No comments yet. Add yours below!

Add a Comment

Your Comment

Please enter your name.

    Please enter your email address

      Please enter your Comment.

          Related Cheat Sheets

          Android Activity Manager (am) Cheat Sheet
          Android Package Manager (pm) Cheat Sheet