Erstmal müssen wir den .jar runterladen: http://simple.sourceforge.net/download.php

Dan geben wir ihn in den Buil Path ein:

Im Manifest muss die Permission sein:

<uses-permission android:name="android.permission.INTERNET" />

Die einfache XML die wir parsen:

<data>
<name>Example Name</name>
</data>

 
Hier unser Ergebniss:

 
…und der Code:
 
Data.java

package de.worldling;

import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;

@Root
public class Data {

	public Data(){
		super();
	}

	public Data(String name){
		this.name = name;
	}

	@Element
	private String name;

	public String getName() {
		return name;
	}
}

 
SimpleParsingTestActivity.java

package de.worldling;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

public class SimpleParsingTestActivity extends Activity {

	private static final String url = "http://www.worldling.de/data.xml";
	TextView name;
	private DefaultHttpClient client = new DefaultHttpClient();

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		name = (TextView) findViewById(R.id.tvForParsing);

		parseXml();
	}

	private void parseXml() {
		try {
			String xmlData = retrieve(url);
			Serializer serializer = new Persister();

			Reader reader = new StringReader(xmlData);
			Data user = serializer.read(Data.class, reader);

			String tempName = user.getName();
			name.setText(tempName);
		} catch (Exception e) {
			Toast.makeText(this, "Error Occured", Toast.LENGTH_LONG).show();
		}

	}

	public String retrieve(String url) {

		HttpGet getRequest = new HttpGet(url);
		try {
			HttpResponse getResponse = client.execute(getRequest);
			final int statusCode = getResponse.getStatusLine().getStatusCode();

			if (statusCode != HttpStatus.SC_OK) {
				return null;
			}

			HttpEntity getResponseEntity = getResponse.getEntity();
			if (getResponseEntity != null) {
				return EntityUtils.toString(getResponseEntity);
			}
		} catch (IOException e) {
			getRequest.abort();
			Log.w(getClass().getSimpleName(), "Error for URL " + url, e);
		}
		return null;

	}
}

Heute ohne xml, nur Java Code für eine einfache SharedPreferences App

package de.worldling;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class PreferencesTestActivity extends Activity implements OnClickListener{

	EditText editText;
	SharedPreferences sharedPreferences;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        setupStuff();
        sharedPreferences = getSharedPreferences("SharedString1", 0);
    }

	private void setupStuff() {
		Button next = (Button) findViewById(R.id.bNext);
		Button save = (Button) findViewById(R.id.bSave);
		editText = (EditText) findViewById(R.id.et1);

		next.setOnClickListener(this);
		save.setOnClickListener(this);
	}

	public void onClick(View v) {
		switch (v.getId()){
		case R.id.bSave:
			String string = editText.getText().toString();//set up string to save
			Editor editor = sharedPreferences.edit(); //edit the SharedPreferences 'sharedPreferences'
			editor.putString("string1", string); //put the string and lable it as "string1"
			editor.commit(); //commit it
			break;
		case R.id.bNext:
			Intent intent = new Intent(PreferencesTestActivity.this, NewClass.class);
			startActivity(intent);
			break;
		}
	}
}

package de.worldling;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.TextView;

public class NewClass extends Activity{

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.two);
		TextView tv2 = (TextView) findViewById(R.id.tv2);

		SharedPreferences someData = getSharedPreferences("SharedString1", 0);
		String dataReturned = someData.getString("string1", "default");
		tv2.setText(dataReturned);
	}
}

private TextView textView;
textView = (TextView) findViewById(R.id.tv1);
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
String string = sharedPreferences.getString("thename", "");
textView.setText(string);

Es müssen 3 .xml Dateien erschaffen werden: menu1.xml, array.xml und prefs1.xml

menu1.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

<item
android:id="@+id/preferences"
android:title="Preferences"/>
<item
android:id="@+id/exit"
android:title="Exit App"/>

</menu>

array.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string-array name="list">
<item> Option 1 </item>
<item> Option 2 </item>
</string-array>

<string-array name="values">
<item>1</item>
<item>2</item>
</string-array>

</resources>

prefs1.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >

<EditTextPreference
android:key="The name"
android:summary="Your name:"
android:title="Name" />

<ListPreference
android:entries="@array/list"
android:entryValues="@array/values"
android:key="List Pref1"
android:summary="The List Preference"
android:title="List" />

</PreferenceScreen>

Der Java Code:

 
PrefTestActivity.java

package de.worldling;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.MenuInflater;
import android.view.MenuItem;

public class PrefTestActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

	@Override
	public boolean onCreateOptionsMenu(android.view.Menu menu) {
		// TODO Auto-generated method stub
		super.onCreateOptionsMenu(menu);
		MenuInflater menuInflater = getMenuInflater();
		menuInflater.inflate(R.menu.menu1, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch(item.getItemId()){
		case R.id.preferences:
			Intent intent = new Intent(PrefTestActivity.this, Prefs1.class);
			startActivity(intent);
			break;
		case R.id.exit:
			finish();
			break;
		}
		return false;
	}
}

 
Prefs1.java

package de.worldling;

import android.os.Bundle;
import android.preference.PreferenceActivity;

public class Prefs1 extends PreferenceActivity{

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		addPreferencesFromResource(R.xml.prefs1);

	}

}

Eine App in der man mit Button Click einen Parameter zu einer anderen Activity weiter recht.

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:padding="40dp"
android:layout_height="fill_parent"
android:orientation="vertical" >

<EditText
android:id="@+id/etPar"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</EditText>

<Button
android:id="@+id/bPar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=" Pass the parameter" />

</LinearLayout>

new_lay.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="40dp">

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Your parameter: " />

<TextView
android:id="@+id/tvPar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#00FFFF"
android:text="..." />

</LinearLayout>

Manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="de.worldling"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="8" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".ParActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".NewClass"
android:label="@string/app_name" >
>
</activity>
</application>

</manifest>

ParActivity.java

package de.worldling;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class ParActivity extends Activity implements OnClickListener{

	EditText editText;
	Button button;
	String string;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        initStuff();
    }

	private void initStuff() {
		editText = (EditText) findViewById(R.id.etPar);
		button = (Button) findViewById(R.id.bPar);

		button.setOnClickListener(this);
	}

	public void onClick(View v) {
		string = editText.getText().toString();
		Bundle bundle = new Bundle();
		bundle.putString("key1", string);
		Intent intent = new Intent(ParActivity.this, NewClass.class);
		intent.putExtras(bundle);
		startActivity(intent);
	}
}

 
NewClass.java

package de.worldling;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class NewClass extends Activity{

		TextView textView;
		String string;

		@Override
		protected void onCreate(Bundle savedInstanceState) {
			super.onCreate(savedInstanceState);
			setContentView(R.layout.new_lay);

			textView = (TextView) findViewById(R.id.tvPar);

			Bundle bundle = getIntent().getExtras();
			string = bundle.getString("key1");
			textView.setText(string);
		}

}

Eine App, die mit dem ToogleButton unser Password anzeigt oder es versteckt.

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:padding="40dp" >

<EditText
android:id="@+id/etPass"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="Type the password"
android:password="true" />

<ToggleButton
android:id="@+id/tbPassword"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:checked="true"
android:paddingBottom="10dp"
android:text="ToggleButton"
android:textOff="Showing password"
android:textOn="Hiding password" />

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="100" >

<TextView
android:id="@+id/tvPass"
android:layout_width="fill_parent"
android:gravity="center"
android:layout_height="match_parent"
android:layout_weight="30"
android:text="..." />

<Button
android:id="@+id/button1"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_weight="70"
android:text="Check" />
</LinearLayout>

</LinearLayout>

Unser Java Code:

package de.worldling;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.text.InputType;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import android.widget.TextView;
import android.widget.ToggleButton;

public class PassProjectActivity extends Activity implements View.OnClickListener {

	EditText editText;
	Button button;
	ToggleButton toggleButton;
	TextView textView;
	String string;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        initStuff();
    }

	private void initStuff() {
		editText = (EditText) findViewById(R.id.etPass);
		button = (Button) findViewById(R.id.button1);
		toggleButton = (ToggleButton) findViewById(R.id.tbPassword);
		textView = (TextView) findViewById(R.id.tvPass);

        button.setOnClickListener(this);
        toggleButton.setOnClickListener(this);
	}

	public void onClick(View v) {

		switch (v.getId()){
		case R.id.tbPassword:
			if (toggleButton.isChecked()){
				editText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
			} else{
				editText.setInputType(InputType.TYPE_CLASS_TEXT);
			}
			break;

		case R.id.button1:
			string = editText.getText().toString();
			if(string.equals("pass")){
				textView.setText(string);
				textView.setTextColor(Color.GREEN);
			}else{
				textView.setText("WRONG");
				textView.setTextColor(Color.RED);
			}
			break;

		}
	}
}

background.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >

<gradient
android:angle="270"
android:endColor="#000000"
android:startColor="#FFFFFF" />

</shape>

Die Activity:

package com.example;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Path.Direction;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class Start1 extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(new GraphicsView(this));

	}

	static public class GraphicsView extends View {
		public GraphicsView(Context context) {
			super(context);
			setBackgroundResource(R.drawable.background);
		}

		@Override
		protected void onDraw(Canvas canvas) {
			Paint paint1 = new Paint();
			Paint paint2 = new Paint();
			paint1.setColor(Color.WHITE);
			paint2.setColor(Color.BLACK);	

			Path circle = new Path();
			Path circle2 = new Path();
			Path circle3 = new Path();

			circle.addCircle(300, 300, 200, Direction.CW);
			canvas.drawPath(circle, paint1);
			circle2.addCircle(300, 300, 50, Direction.CW);
			canvas.drawPath(circle2, paint2);
			circle3.addCircle(300, 300, 10, Direction.CW);
			canvas.drawPath(circle3, paint1);
		}

	}
}

Es ist immer gut, wenn eine Android App uns mit einen Splash Screen begrüßt. Hier ein Tutorial dafür:

Der splash.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@drawable/back"
>
</LinearLayout>

Der Manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="de.worldling"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="8" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".Splash"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Sound1"
android:label="@string/app_name" >
<intent-filter>
<action android:name="de.worldling.SOUND1" />

<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>

</manifest>

Und die Java Classe, splash.java:

package de.worldling;

import java.io.IOException;

import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;

public class Splash extends Activity {

	MediaPlayer mp;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.splash);

		mp = MediaPlayer.create(Splash.this, R.raw.sound1);
		mp.start();

		Thread timer = new Thread() {
			public void run() {
				try {
					sleep(5000);// 5 seconds
				} catch (InterruptedException e) {
					e.printStackTrace();
				} finally {
					Intent openStartingPoint = new Intent("de.worldling.SOUND1");
					startActivity(openStartingPoint);
				}
			}
		};
		timer.start();
	}

	@Override
	protected void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
		mp.release();
		finish();
	}

}

Eine einfache App, mit der man einen Mp3 Sound abspielen kann.

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
android:id="@+id/bAudio"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="50dp"
android:text="Audio 1"
android:textSize="20dp" />

<Button
android:id="@+id/bAudio2"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Audio 2"
android:textSize="20dp" />

</LinearLayout>

Unsere Activity

package de.worldling;

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Sound1 extends Activity {

	public MediaPlayer mp;
	Button audio1, audio2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        audio1 = (Button) findViewById(R.id.bAudio);
        audio2 = (Button) findViewById(R.id.bAudio2);

        audio1.setOnClickListener(new OnClickListener() {

			public void onClick(View v) {
				mp = MediaPlayer.create(getApplicationContext(), R.raw.sound1);
				mp.start();
			}
		});

        audio2.setOnClickListener(new OnClickListener() {

			public void onClick(View v) {
				mp = MediaPlayer.create(getApplicationContext(), R.raw.sound2);
				mp.start();
			}
		});

    }
}

Wir schreiben ein Android App, die einen TextVeiw und zwei Buttons hat.

So sieht sie aus:

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:padding="50dip" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:orientation="vertical" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginBottom="25dip"
            android:text="@string/title"
            android:textSize="30sp" />

        <Button
            android:id="@+id/button1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/button1" />

        <Button
            android:id="@+id/button2"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/button2" />
    </LinearLayout>

</LinearLayout>

 
Das sagt und wie der Layout aussehen soll. ‘fill_parent’ oder ‘wrap_content’
 

        android:layout_width="fill_parent"
        android:layout_height="wrap_content"

Sind auch visuelle Aspekte.
 

        android:layout_gravity="center"
        android:orientation="vertical"

Welcher String sold dort sein?
 

	android:text="@string/title"

Wir geben den Button en ID
 

	android:id="@+id/button1"

Die erste Activity Class:

package de.worldling;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;

public class Worldling1Activity extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

		//click listeners
		View aboutButton = findViewById(R.id.button1);
		aboutButton.setOnClickListener(this);
		View exitButton = findViewById(R.id.button2);
		exitButton.setOnClickListener(this);
    }

	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.button1:
			Intent i = new Intent(this, Test1.class);
			startActivity(i);
			break;
		case R.id.button2:
			finish();
			break;
		}

	}
}

Ein Switch der die Buttons unterstützt
 

    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button1:
            Intent i = new Intent(this, Test1.class);
            startActivity(i);
            break;
        case R.id.button2:
            finish();
            break;
        }
    }

 
Test1.java – die Java Classe für den test1.xml

package de.worldling;

import android.app.Activity;
import android.os.Bundle;

public class Test1 extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.test1);
	}
}

test1.xml – der XML für unseren Dialog

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="30dip" >

<TextView
android:id="@+id/about_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/test" />

</ScrollView>

strings.xml – wo alle String sind

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string name="app_name">Worldling1</string>
<string name="title">Worldling1 App</string>
<string name="title2">Test1</string>
<string name="button1">Button</string>
<string name="button2">Exit</string>
<string name="test">Worldling test</string>

</resources>

Der Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="de.worldling"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="8" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".Worldling1Activity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Test1"
android:label="@string/title2"
android:theme="@android:style/Theme.Dialog" >
</activity>
</application>

</manifest>