, , (),
Properties. , , Layouts, Widgets, Text Fields . Widgets ImageButton, . , , .
. . .
activity_main.xml. Properties, . , . , ImageButton TextView Hello World!. , , . , background. , . , , , .
Color , . FFC0CB #.
OK . .
, , RelativeLayout :
android:background="#ffffc0cb"
. . , .
background Project. New Resource... New Color Value.... . . , colors.xml. , strings.xml styles.xml, .
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OK . :
android:background="@color/background_color"
. , , res/drawable-hdpi. , , .
.
, Drawable , . ImageButton src. Drawable - pinkhellokitty ( ).
, , . , .. .
onClick onClick - . , , onButtonPressed, .
. , TextView Hello, World (ID). , , . Widgets Large Text . .
- id. , @+id/textView. . , , . , . . Large Text. .
:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/background_color"
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="ru.alexanderklimov.hellokitty.MainActivity">
<ImageButton
android:id="@+id/imageButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
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android:layout_centerVertical="true"
android:onClick="onClick"
android:src="@drawable/pinkhellokitty" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/imageButton"
android:layout_alignStart="@+id/imageButton"
android:layout_below="@+id/imageButton"
android:layout_marginTop="42dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
"onClick" Alt + Enter
Create 'onClick(View)' in 'MainActivity'.
MainActivity .
MainActivity.java, . , . onCreate() :
private TextView mHelloTextView;
TextView mHelloTextView.
Enter, TextView import. , TextView .
onCreate() setContentView() :
mHelloTextView = (TextView)findViewById(R.id.textView); // , ?
, (Ctrl+) . . TextView , , .
.
public void onClick(View view) {
}
, :
mHelloTextView.setText("Hello Kitty!");
mHelloTextView setText() .
. , . - , XML-, .
app\build\outputs\apk APK-, ( ), .
,
// , ,
// , , .
package ru.alexanderklimov.hellokitty;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends Activity {
private TextView mHelloTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHelloTextView = (TextView) findViewById(R.id.textView);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
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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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void onClick(View view) {
mHelloTextView.setText("Hello Kitty!");
}
}
. Text Fields Plain Text , - . , hint -, .
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/editText"
android:layout_above="@+id/imageButton"
android:layout_centerHorizontal="true"
android:layout_marginBottom="66dp"
android:hint=" " />
MainActivity mHelloTextView:
private EditText mNameEditText;
onCreate():
mNameEditText = (EditText) findViewById(R.id.editText);
.
public void onClick(View view) {
if (mNameEditText.getText().length() == 0) {
mHelloTextView.setText("Hello Kitty!");
} else {
mHelloTextView.setText(", " + mNameEditText.getText());
}
}
. , - "Hello Kitty!". , . .
, . , Hellow World! , , TextView "Hellow World!" ( "Hellow World!" ) , Text , , ( , ):
< TextView
android:text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="183dp"
android:textSize="25pt"/>
Preview .
! APK , , . , ( , ) Run, Run --- Run "app", Shift + F10. / . , Android !
1.4. , - . () . . (<activity>, <service>, <receiver>, <provider> ), . , , . . , , . Android:
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,
nd - erfpfybtallowBackup
. ...
<activity
android:name="com.example.geodating.GS_selection"
android:label="@string/app_name"
android:theme="@android:style/Theme.Dialog"
android:configChanges="keyboardHidden|orientation" >
</activity>
<permission> , . , . (Activities, Services, Broadcast receivers Content providers) . , Android , .
<uses-permission> , . , .
:
INTERNET
READ_CONTACTS ( )
WRITE_CONTACTS ( )
RECEIVE_SMS SMS
ACCESS_FINE_LOCATION GPS
<uses-sdk> ( API) Android. API, , API , .
:
android:minSdkVersion API, . Android , , API , , .
android:maxSDKVersion , .
targetSDKVersion , .
<uses-configuration> . , , . , <uses-configuration> .
<uses-feature> , . , , . , , . , .
:
android.hardware.camera .
android.hardware.camera.autofocus .
<supports-screens> , . API 4 .
<application> , . (<activity>, <service>, <receiver>, <provider> ), , . <application>.
Palette. .
Form Widgets
TextView ()
Button ()
ToggleButton (-)
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CheckBox ()
RadioButton ()
Spinner ( )
ProgressBar (Large, Normal, Small, Horizontal) -
SeekBar ()
QuickContactBadge
RatingBar ()
Switch ( )
ListPopupWindow
Text Fields
EditText ( )
AutoCompleteTextView (????????), MultiAutoCompleteTextView
Layouts
GridLayout
LinearLayout
RelativeLayout
FrameLayout
Include Other Layout
Fragment
TableLayout TableRow
Space
DrawerLayout
SlidingPanelLayout
SwipeRefreshLayout
BlinkLayout ()
CardView ().
