Project : app Gradle Scripts. app - , .. , .
app. : manifest, java, res.
manifest. AndroidManifest.xml. Gradle.
, , - . . , , . AndroidManifest.xml , Android-.
java. - . . MainActivity. .
res. res , .
drawable , .
layout xml-, . activity_main.xml, .
menu - , , menu_main.xml, .
values - , , , , .
. activity_main.xml. - Design Text.
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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<TextView
android:text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
, android:text="@string/hello_world" android:text="Hello World!". , Hello World!, . , , , . , , , 16dp. .. , , @string/hello_world. Ctrl + - () .
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XML-. RelativeLayout, TextView, . , hello_world. res/values/strings.xml.
Java- (MainActivity.java)
package ru.alexanderklimov.helloworld;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@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);
}
}
, MainActivity java ( Java). - (Package Name). . . . , ( Unused import statement) .
, (extends) Activity. . , ActionBarActivity, . , Android 4.1. , Android 4, , Android . ActionBarActivity . Activity. , . . , .
onCreate() , . .
super.onCreate(savedInstanceState); , . , .
setContentView(R.layout.activity_main); . setContentView(int) . res/layout. activity_main.xml. cat.xml . :
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setContentView(R.layout.cat);
, . . , Settings.
