Archive for February, 2012

Einfaches XML Parsen in Android mit SimpleXML

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;

	}
}

SharedPreferences in Android

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);
	}
}

Auf Preferences in Android Zugreifen
 

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

Android Preferences setzen mit Menu und PreferenceActivity

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);

	}

}

Android – Parameters passing zu einer anderen Activity

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);
		}

}