. , .. , , , . .
Android , XML-, -. . . . XML- res/layout . "res" "resources" (). , . , , , ..
res/layout activity_main.xml, . , XML- : . : Design Text.
.1.6.
Text.
XML- - XML-, View (TextView - View). , XML. .
Hello World . , . Hello Kitty .
, , Layouts, Widgets, Text Fields . Widgets ImageButton, . , , .
. . .
activity_main.xml. Properties, . , . , ImageButton TextView Hello World!. , , . , background. , . , , , .
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Color , . FFC0CB #.
OK . .
, , RelativeLayout :
android:background="#ffffc0cb"
. . , .
background Project. New Resource... New Color Value.... . . , colors.xml. , strings.xml styles.xml, .
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"
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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"
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-, ( ), .
,
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// , ,
// , , .
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.
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!". , . .
