extras (Android Studio library, Google Repository, etc) from the Android SDK Manager installed.
<xliff:g> placeholder tag. Here's an example tag that ensures the text "%1$s" will not be changed during translation (otherwise it could break the message):<string name="countdown"> <xliff:g id="time" example="5 days>%1$s</xliff:g>until holiday</string>
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2"> <!-- Example placeholder for a special unicode symbol --> <string name="star_rating">Check out our 5 <xliff:g id="star">\u2605</xliff:g> </string> <!-- Example placeholder for a for a URL --> <string name="app_homeurl"> Visit us at <xliff:g id="application_homepage">http://my/app/home.html</xliff:g> </string> <!-- Example placeholder for a name --> <string name="prod_name"> Learn more at <xliff:g id="prod_gamegroup">Game Group</xliff:g> </string> <!-- Example placeholder for a literal --> <string name="promo_message"> Please use the "<xliff:g id="promotion_code">ABCDEFG</xliff:g>” to get a discount. </string> ... </resources>
res/values/strings.xml:<?xml version="1.0" encoding="utf-8"?> <resources> <string name="hello">Hello!</string> </resources>
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" />
String string = getString(R.string.hello);
Intent intent = new Intent (Intent.ACTION_VIEW);intent.setData(Uri.parse("geo:47.6, -122.3"));if (intent.resolveActivity(getPackageManager()) != null) { startActivity (intent);}
<TextView android:id="@+id/menu_item_1"
public void printToLogs(View view) { // Find first menu item TextView and print the text to the logs TextView menuItem1 = (TextView) findViewById(R.id.menu_item_1); String input1 = menuItem1.getText().toString(); Log.i("EnterpriseActivity.java", input1);
setText and setImageResource. These are called setter methods because they are meant to modify or manipulate one value of a view (such as the text or image that it stores). Conventionally they start with the word "set".Project / app / src / res
/** * * @param message is the message to be shown when we press the order button. */ private void displayMessage(String message) { TextView priceTextView = (TextView) findViewById(R.id.price_text_view); priceTextView.setText(message); } }
public double calculateAnswer(double wingSpan, int numberOfEngines,
double length, double grossTons) {
//do the calculation here
}
public class DataArtist {
...
public void draw(String s) {
...
}
public void draw(int i) {
...
}
public void draw(double f) {
...
}
public void draw(int i, double f) {
...
}
}
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.ersanaskin.notopening.MainActivity" android:orientation="vertical"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="TOPPINGS" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="15dp"> <CheckBox android:text="CheckBox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/checkBox" android:layout_weight="1" android:layout_marginRight="30dp"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Whipped Cream" /> </LinearLayout> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="QUANTITY" android:layout_marginTop="20dp"/> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="15dp"> <Button android:layout_width="50dp" android:layout_height="wrap_content" android:text="-" android:onClick="decreaseQuantity"/> <TextView android:id="@+id/quantity_text_view" android:layout_width="50dp" android:layout_height="wrap_content" android:text="0" android:textAlignment="center"/> <Button android:layout_width="50dp" android:layout_height="wrap_content" android:text="+" android:onClick="increaseQuantity"/> </LinearLayout> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="ORDER SUMMARY" android:layout_marginTop="15dp"/> <TextView android:id="@+id/order_summary_text_view" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="15dp"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="ORDER" android:onClick="displayMessage"/></LinearLayout>
package com.example.ersanaskin.notopening; import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.TextView; public class MainActivity extends AppCompatActivity { int quantity = 0; int coffeePrice = 10; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void increaseQuantity(View view){ quantity ++; display(quantity); } public void decreaseQuantity(View view){ quantity --; display(quantity); } private void display(int number) { TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view); quantityTextView.setText("" + number); } public void displayMessage(View v) { String message = "Hello Ersan. You bought " + quantity + " coffee. Please pay $" + quantity * coffeePrice + "."; TextView orderSummaryTextView = (TextView) findViewById(R.id.order_summary_text_view); orderSummaryTextView.setText(message); } }
package com.example.ersanaskin.justjava;
/** * Add your package below. Package name can be found in the project's AndroidManifest.xml file.
* This is the package name our example uses: * * package com.example.android.justjava; */
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
import java.text.NumberFormat;
/** * This app displays an order form to order coffee. */
public class MainActivity extends AppCompatActivity {
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/** * This method is called when the order button is clicked. */
public void submitOrder(View view) {
display(2 * 2);
displayPrice(2 * 5);
}
/** * This method displays the given quantity value on the screen. */
private void display(int number) {
TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
quantityTextView.setText("" + number);
}
private void displayPrice(int number) {
TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
}
| Escape Sequence | Description |
|---|---|
\t | Insert a tab in the text at this point. |
\b | Insert a backspace in the text at this point. |
\n | Insert a newline in the text at this point. |
\r | Insert a carriage return in the text at this point. |
\f | Insert a formfeed in the text at this point. |
\' | Insert a single quote character in the text at this point. |
\" | Insert a double quote character in the text at this point. |
\\ | Insert a backslash character in the text at this point. |
% Remainder operator
Unary Operators
! Logical complement operator; inverts the value of a booleanConditional Operators
&& Conditional-AND || Conditional-OR ?: Ternary (shorthand forif-then-elsestatement)Type Comparison Operator
instanceof Compares an object to a specified typeBitwise and Bit Shift Operators
~ Unary bitwise complement << Signed left shift >> Signed right shift >>> Unsigned right shift & Bitwise AND ^ Bitwise exclusive OR | Bitwise inclusive OR
package com.example.ersanaskin.justjava; /** * Add your package below. Package name can be found in the project's AndroidManifest.xml file. * This is the package name our example uses: * * package com.example.android.justjava; */ import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.TextView; /** * This app displays an order form to order coffee. */public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } /** * This method is called when the order button is clicked. */ public void submitOrder(View view) { display(1); } /** * This method displays the given quantity value on the screen. */ private void display(int number) { TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view); quantityTextView.setText("" + number); } }
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="16dp" android:paddingRight="16dp" android:orientation="vertical" android:paddingTop="16dp"> <TextView android:id="@+id/quantity_text_view" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textAppearance="?android:textAppearanceLarge" android:textColor="@android:color/black" android:textStyle="bold" android:text="quantity" android:textAllCaps="true"/> <TextView android:id="@+id/number_text_wiew" android:layout_width="100dp" android:layout_height="wrap_content" android:textAppearance="?android:textAppearanceLarge" android:textColor="@android:color/darker_gray" android:textStyle="bold" android:text="0"/> <Button android:id="@+id/button" android:layout_width="100dp" android:layout_height="wrap_content" android:text="button" android:textAllCaps="true"/> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"> <ImageView
android:id="@+id/imageRuya"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_margin="8dp"
android:scaleType="centerCrop"
android:src="@drawable/ruya" /> <TextView
android:id="@+id/adi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Rüya Aşkın"
android:textStyle="bold"
android:textAppearance="?android:textAppearanceMedium"
android:layout_alignTop="@+id/imageRuya"
android:layout_alignLeft="@+id/lakabi"
android:layout_alignStart="@+id/lakabi" />
<TextView
android:id="@+id/lakabi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Lakabı: Prenses"
android:textAppearance="?android:textAppearanceSmall"
android:layout_below="@+id/adi"
android:layout_alignLeft="@+id/yasi"
android:layout_alignStart="@+id/yasi" /> <TextView android:id="@+id/yasi" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/lakabi" android:layout_toRightOf="@id/imageRuya" android:text="Yaş: 10" android:textAppearance="?android:textAppearanceSmall" /> <ImageView android:id="@+id/imageOmer1" android:layout_width="100dp" android:layout_height="100dp" android:layout_margin="8dp" android:scaleType="centerCrop" android:src="@drawable/omer" android:layout_below="@id/imageRuya"/> <TextView android:id="@+id/adi1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@id/imageOmer1" android:layout_toRightOf="@id/imageOmer1" android:text="Ömer Aşkın" android:textStyle="bold" android:textAppearance="?android:textAppearanceMedium" /> <TextView android:id="@+id/lakabi1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/adi1" android:layout_toRightOf="@id/imageOmer1" android:text="Lakabı: Iron Man" android:textAppearance="?android:textAppearanceSmall" android:layout_marginTop="4dp"/> <TextView android:id="@+id/yasi1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/lakabi1" android:layout_toRightOf="@id/imageOmer1" android:text="Yaş: 6" android:textAppearance="?android:textAppearanceSmall" /></RelativeLayout>