Intent in = getIntent();
String kelas = in.getStringExtra(“kelas”);
String cek_kelas = kelas.substring(0,1);
cek_kelas = cek_kelas.trim();
if (cek_kelas.equals(“1″)) {
…..
<string-array name=”type”> <item>1</item> <item>2<item> </string-array>
<Spinner: android:id=”@+id/spinner_type” android:entries=”@array/type” />
spinner_text = (Spinner) findViewById (R.id.spinner_type)
<ListView android:layout_width=”fill_parent” android:layout_height=”0dp” android:layout_weight:”1″ />
if (adapter.getCount()==0) {
Toast.makeText(YourActivity.this,”No Record found”,Toast.LENGTH_SHORT).show();
}
<activity android:label=”@string/app_name” android:name=”.DashboardActivity”> <intent-filter> <action android:name=”android.intent.action.MAIN”> <category android:name=”android.intent.category.LAUNCHER”> </intent-filter> </activity>
public class Constants {
public static final String alamat = “192.168.0.1″;
}
Lalu cara menggunakannya di class yang berbeda adalah sebagai berikut: private static final String URL = “http://”+Constants.alamat+”…”;
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(YourActivity.this);
pDialog.setMessage("Loading profile ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
package ngodingandroid.httprequest;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import ngodingandroid.httprequest.R.string;
public class ProfileActivity extends Activity {
TextView txtUsername;
TextView txtFullname;
TextView txtPosition;
TextView txtSubject;
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
JSONObject profile;
private static final String PROFILE_URL = "http://yoururl.com/data.php";
private static final String TAG_PROFILE = "data";
private static final String TAG_USER = "username";
private static final String TAG_NAME = "fullname";
private static final String TAG_POSITION = "position";
private static final String TAG_SUBJECT = "subject";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.profile);
txtUsername = (TextView) findViewById(R.id.username);
txtFullname = (TextView) findViewById(R.id.fullname);
txtPosition = (TextView) findViewById(R.id.position);
txtSubject = (TextView) findViewById(R.id.subject);
new LoadProfile().execute();
}
/**
* Background Async Task to Load profile by making HTTP Request
* */
class LoadProfile extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ProfileActivity.this);
pDialog.setMessage("Loading profile ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting Profile JSON
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>(1);
params.add(new BasicNameValuePair("username", user));
// getting JSON string from URL
JSONObject json = jsonParser.makeHttpRequest(PROFILE_URL, "GET",params);
try {
// profile json object
profile = json.getJSONObject(TAG_PROFILE);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
// Storing each json item in variable
try {
String username = profile.getString(TAG_USER);
String fullname = profile.getString(TAG_NAME);
String position = profile.getString(TAG_POSITION);
String subject = profile.getString(TAG_SUBJECT);
// displaying all data in textview
txtUsername.setText("Username: " + username);
txtFullname.setText("Fullname: " + fullname);
txtPosition.setText("Position: " + position);
txtSubject.setText("Subject: " + subject);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
}
}
Context context = getApplicationContext(); // or activity.getApplicationContext()
PackageManager packageManager = context.getPackageManager();
String packageName = context.getPackageName();
String myVersionName = "Not Available"; // initialize String
try {
myVersionName = packageManager.getPackageInfo(packageName, 0).versionName;
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
// set version name to a TextView
TextView VersionName = (TextView) findViewById(R.id.version);
VersionName.setText(myVersionName);
package ngodingandroid.intrografik;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends Activity {
DemoView demoview;
//@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
demoview = new DemoView(this);
setContentView(demoview);
}
private class DemoView extends View{
public DemoView(Context context){
super(context);
}
@Override protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//deklarasi object paint
Paint paint = new Paint();
//set warna latar belakang dg format ARGB
paint.setStyle(Paint.Style.FILL);
paint.setColor(0xff0000ff);
canvas.drawPaint(paint);
//menulis string pada mode grafis
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.YELLOW);
paint.setTextSize(30);
canvas.drawText("Tulisan di mode grafis Android", 25, 75, paint);
//membuat kotak
paint.setAntiAlias(true);
paint.setColor(Color.RED);
canvas.drawRect(50, 100, 420, 130, paint);
//menggambar lingkaran
int x;
x=1;
while (x<=11) {
paint.setColor(Color.GREEN);
canvas.drawCircle(50 + (x * 30), 150, 15, paint);
x=x+1;
}
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(2);
paint.setColor(Color.YELLOW);
Path path = new Path();
path.moveTo(0, 0);
path.lineTo(5, 50);
path.lineTo(-50, 0);
path.close();
path.offset(200, 200);
canvas.drawPath(path, paint);
path.offset(50, 0);
canvas.drawPath(path, paint);
path.offset(50, 0);
canvas.drawPath(path, paint);
}
}
}
package ngodingandroid.splashscreen;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
package ngodingandroid.splashscreen;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
public class SplashScreen extends Activity {
// Splash screen timer
private static int SPLASH_TIME_OUT = 3000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent i = new Intent(SplashScreen.this, MainActivity.class);
startActivity(i);
finish();
}
}, SPLASH_TIME_OUT);
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/gradient_background" > <ImageView android:id="@+id/imgLogo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/logo" /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginBottom="10dp" android:textSize="12dp" android:textColor="#454545" android:gravity="center_horizontal" android:layout_alignParentBottom="true" android:text="ngodingandroid.blogspot.com" /> </RelativeLayout>
<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: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="ngodingandroid.splashscreen.MainActivity" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="ngodingandroid.splashscreen" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".SplashScreen" android:label="@string/app_name" android:screenOrientation="portrait" android:theme="@android:style/Theme.Black.NoTitleBar" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <!-- Main activity --> <activity android:name=".MainActivity" android:label="@string/app_name" > </activity> </application> </manifest>
package ngodingandroid.helloworld;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
<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: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="ngodingandroid.helloworld.MainActivity" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> </RelativeLayout>Untuk file AndroidManifest, akan dibuat sendiri oleh Eclipse. Jadi sekarang tinggal mencoba program ke emulator device Android yang sudah dipersiapkan terlebih dahulu.
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> </LinearLayout>Seperti yang dapat kita lihat, interface Android disusun dengan format XML, sehingga dapat dengan mudah kita pelajari. Pembahasan tentang file layout XML ini akan saya bahas di tulisan saya yang lain. Selanjutnya, ada juga folder values, yang biasanya berisi file XML untuk pengaturan string maupun color. Jika memang dibutuhkan, aplikasi kita nantinya akan merujuk pada nilai-nilai yang tersimpan pada file XML ini. Dan yang terakhir, yang kadang sering luput dari pengamatan kita yaitu file AndroidManifest.xml yang fungsinya kurang lebih mengatur konfigurasi dari aplikasi kita, misalnya untuk mendaftarkan class baru yang akan kita gunakan, ataupun mengatur permission apakah aplikasi kita nantinya boleh menggunakan internet atau tidak.
package com.example.tes;
import android.app.Activity;
import android.os.Bundle;
public class TesActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
class A {
public void DoSomething() {
Output("A");
}
}
class B extends A {
@Override
public void DoSomething() {
Output("B");
}
}
class B extends A {
@Override
public void DoSomething() {
super.DoSomething();
Output("B");
}
}
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