Button:OnClick() neue Activity starten

Blackscreen · 2012-10-18T10:15:12+0200

Hei Leute!

Habe eine Frage, und zwar will ich, wenn ein Button geklickt wird.
eine neue Klasse aufgerufen wird & die in den Vordergrund kommt. hier die Screens:
Hier der Menübutton um das menü aufzurufen:

Hier der RSS-Feed Button mit der die neue Activity gestartet werden soll.

main-Activity Code:

Code:

        public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        MenuList = (LinearLayout) findViewById(R.id.linearLayout2);
        btnToggleMenuList = (Button) findViewById(R.id.button1);
        nasabtn = (Button) findViewById(R.id.NasaFeed);
        strg = false;
        isExpanded = true;
        //Start-designs
        
        hideAllElements();
        
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        screenWidth = metrics.widthPixels;
        btnToggleMenuList.setOnClickListener(new OnClickListener() {
        	public void onClick(View v) {
        		if (isExpanded) {
        			isExpanded = false;
        			MenuList.startAnimation(new ExpandAnimation(MenuList, 0,(int)(screenWidth*0.7), 20));
        			MenuList.setVisibility(View.VISIBLE);
        			btnToggleMenuList.setClickable(false);
        			nasabtn.setClickable(true);
        			strg = true;
        		}
        	}
        });        
    
    nasabtn.setOnClickListener(new OnClickListener()	{
    	public void onClick(View v){
    		if(strg){
    			MenuList.startAnimation(new CollapseAnimation(MenuList, 0,(int)(screenWidth*0.7), 20));
        		MenuList.setVisibility(View.INVISIBLE);
        		btnToggleMenuList.setClickable(true);
    			nasabtn.setClickable(false);
    			isExpanded = true;
    			strg = false;
    		}else{
    			
    		}
    	}
    });
    }
    
    private void hideAllElements(){
    	MenuList.setVisibility(View.INVISIBLE);
        MenuList.startAnimation(new ExpandAnimation(MenuList, 0, 0, 0));
    }
    
    @Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

Bitte um eure Hilfe Leute.

MatthiasKramer · 2012-10-18T10:26:56+0200

Hi,
gib dem Menü-Button einfach einen onclick-namen (z.b. onClickButton).

Code:

[SIZE=2]
[LEFT][/SIZE][SIZE=2][COLOR=#008080][SIZE=2][COLOR=#008080]<[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2][COLOR=#3f7f7f][SIZE=2][COLOR=#3f7f7f]Button[/LEFT]
[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2][LEFT][/SIZE][SIZE=2][COLOR=#7f007f][SIZE=2][COLOR=#7f007f]android:id[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2]=[/SIZE][I][SIZE=2][COLOR=#2a00ff][SIZE=2][COLOR=#2a00ff]"@+id/button1"[/LEFT]
[/I][/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2][LEFT][/SIZE][SIZE=2][COLOR=#7f007f][SIZE=2][COLOR=#7f007f]android:layout_width[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2]=[/SIZE][I][SIZE=2][COLOR=#2a00ff][SIZE=2][COLOR=#2a00ff]"fill_parent"[/LEFT]
[/I][/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2][LEFT][/SIZE][SIZE=2][COLOR=#7f007f][SIZE=2][COLOR=#7f007f]android:layout_height[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2]=[/SIZE][I][SIZE=2][COLOR=#2a00ff][SIZE=2][COLOR=#2a00ff]"wrap_content"[/LEFT]
[/I][/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2][LEFT][/SIZE][SIZE=2][COLOR=#7f007f][SIZE=2][COLOR=#7f007f]android:layout_alignParentLeft[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2]=[/SIZE][I][SIZE=2][COLOR=#2a00ff][SIZE=2][COLOR=#2a00ff]"true"[/LEFT]
[/I][/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2][LEFT][/SIZE][SIZE=2][COLOR=#7f007f][SIZE=2][COLOR=#7f007f]android:layout_below[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2]=[/SIZE][I][SIZE=2][COLOR=#2a00ff][SIZE=2][COLOR=#2a00ff]"@+id/editText4"[/LEFT]
[/I][/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2][LEFT][/SIZE][SIZE=2][COLOR=#7f007f][SIZE=2][COLOR=#7f007f]android:layout_marginTop[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2]=[/SIZE][I][SIZE=2][COLOR=#2a00ff][SIZE=2][COLOR=#2a00ff]"20dp"[/LEFT]
[/I][/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2][LEFT][/SIZE][SIZE=2][COLOR=#7f007f][SIZE=2][COLOR=#7f007f]android:onClick[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2]=[/SIZE][I][SIZE=2][COLOR=#2a00ff][SIZE=2][COLOR=#2a00ff]"onClickButton"[/LEFT]
[/I][/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2][/SIZE][SIZE=2][COLOR=#7f007f][SIZE=2][COLOR=#7f007f]android:text[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2]=[/SIZE][I][SIZE=2][COLOR=#2a00ff][SIZE=2][COLOR=#2a00ff]"@string/Menu"[/I][/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2] [/SIZE][SIZE=2][COLOR=#008080][SIZE=2][COLOR=#008080]/>
[/COLOR][/SIZE][/COLOR][/SIZE]

Geh dann in die MainActivity.java (Die Activity, wo dein Menübutton ist)
und schreib folgendes:

Code:

public void onClickButton (View view) {
Intent intent = new Intent (this, zweiteActivity.class);
startActivity(intent);
[I]finish(); [/I]
[I]// Das finish(); muss nicht umbedingt sein, aber wenn du dein RSS [/I]
[I]// [/I][I]dann schließt, dann kommst du zurück zum Menü-Button, muss du [/I]
[I]// eben selber wissen, ob du es willst[/I]
}

Gruß

StefMa · 2012-10-18T10:32:00+0200

Du musst allerdings keine onClick in der xml definieren.

Eine innere-Klasse, wie du es ja schon selbst gemacht hast, geht auch.

Gruß

MatthiasKramer · 2012-10-18T10:34:10+0200

IceClaw schrieb:
Du musst allerdings keine onClick in der xml definieren.

Eine innere-Klasse, wie du es ja schon selbst gemacht hast, geht auch.

Gruß

Joa, je nachdem wie mans mag

Blackscreen · 2012-10-18T11:05:43+0200

Danke. Hab das jz gemacht, allerdings bekomm ich jz ne Fehlermeldung die wäre:

10-18 10:40:51.414: E/AndroidRuntime(1641): FATAL EXCEPTION: main
10-18 10:40:51.414: E/AndroidRuntime(1641): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.nasadailyimage/com.example.nasadailyimage.NasaFeed}: java.lang.InstantiationException: com.example.nasadailyimage.NasaFeed

& noch mehr.

MatthiasKramer · 2012-10-18T11:20:37+0200

Was hast du denn genau geschrieben?
Schick uns einfach mal den Code der beiden Activitys

Madlip · 2012-10-18T11:50:18+0200

hast du die aufzurufende activity in deiner manifest deklariert?

Wenn ja, dann sei doch bitte mal so lieb und poste den code

Blackscreen · 2012-10-18T15:32:25+0200

okey. Wie mach ich das im Manifest?

hier der Code von NasaFeed.java:

Code:

public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		MenuList = (LinearLayout) findViewById(R.id.linearLayout2);
        btnToggleMenuList = (Button) findViewById(R.id.button1);
        statbtn = (Button) findViewById(R.id.StatistikenButton);
        //Start-designs
        //hideAllElements();
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        screenWidth = metrics.widthPixels;
		tv1 = (TextView) this.findViewById(R.id.text);
		tv2 = (TextView) this.findViewById(R.id.text);
		iv1 = (ImageView) this.findViewById(R.id.image);
		nasaParser = new NasaParser();
		btn = (Button) findViewById(R.id.button);
		hideText = this.getString(R.string.HideText);
		showText = this.getString(R.string.ShowText);
		strg = false;
		URL url;
		
			try {
				url = new URL(URL_NASA);
			
			// Inputstream aus der URL erstellen
			// und nach Inhalten parsen

			
				
					nasaParser.parse(url.openStream());
					
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (SAXException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			
		btn.setOnClickListener(new OnClickListener()

		{
			public void onClick(View arg0) {
				strg = !strg;
				if (strg) { // wenn strg true ist wird if ausgeführt.
					
						
					resetDisplay(nasaParser.getmTitle(), nasaParser.getmDate(), nasaParser.getmImageUrl(), nasaParser.getmDescription());
						// Ergebnisse in der UI darstellen
						btn.setText(hideText);
						tv1.setVisibility(TextView.VISIBLE);
						tv2.setVisibility(TextView.VISIBLE);
						iv1.setVisibility(ImageView.VISIBLE);
					
				
					
				} else {

					btn.setText(showText);
					tv1.setVisibility(TextView.INVISIBLE);
					tv2.setVisibility(TextView.INVISIBLE);
					iv1.setVisibility(ImageView.INVISIBLE);
				}
			}
			});
		
        btnToggleMenuList.setOnClickListener(new OnClickListener() {
        	public void onClick(View v) {
        		if (isExpanded) {
        			isExpanded = false;
        			MenuList.startAnimation(new CollapseAnimation(MenuList, 0,(int)(screenWidth*0.7), 20));
        			MenuList.setVisibility(View.INVISIBLE);
        			btnToggleMenuList.setClickable(false);
        			btnToggleMenuList.setClickable(true);
        		}else {
            		isExpanded = true;
            		MenuList.startAnimation(new ExpandAnimation(MenuList, 0,(int)(screenWidth*0.7), 20));
            		MenuList.setVisibility(View.VISIBLE);
            		btnToggleMenuList.setClickable(true);
        		}
        	}
        });        
    }
    
    private void hideAllElements(){
    	MenuList.setVisibility(View.INVISIBLE);
        MenuList.startAnimation(new ExpandAnimation(MenuList, 0, 0, 0));
    }
    

		
		

	public void resetDisplay(String title, String date, String imageURL, String Description) {
		tv1.setText(title+ "\n"  + date);
		tv2.setText(Description);
		iv1.setImageBitmap(getImage(imageURL));
	}

	public Bitmap getImage(String stringUrl) {
		try {
			URL url = new URL(stringUrl);
			HttpURLConnection connection = (HttpURLConnection) url.openConnection();
			connection.setDoInput(true);
			connection.connect();
			InputStream input = connection.getInputStream();
			Bitmap myBitmap = BitmapFactory.decodeStream(input);
			connection.disconnect();
			input.close();
			return myBitmap;
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
		
	}
	
	}

hier der Code von der Main:

Code:

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
	private LinearLayout MenuList;
	private Button btnToggleMenuList, nasabtn;
	private int screenWidth;
	private boolean isExpanded,strg;
	private Intent intent;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        intent = new Intent(this, NasaFeed.class);
        MenuList = (LinearLayout) findViewById(R.id.linearLayout2);
        btnToggleMenuList = (Button) findViewById(R.id.button1);
        nasabtn = (Button) findViewById(R.id.button);
        strg = false;
        isExpanded = true;
        //Start-designs
        
        hideAllElements();
        
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        screenWidth = metrics.widthPixels;
        btnToggleMenuList.setOnClickListener(new OnClickListener() {
        	public void onClick(View v) {
        		if (isExpanded) {
        			isExpanded = false;
        			MenuList.startAnimation(new ExpandAnimation(MenuList, 0,(int)(screenWidth*0.7), 20));
        			MenuList.setVisibility(View.VISIBLE);
        			btnToggleMenuList.setClickable(false);
        			nasabtn.setClickable(true);
        			strg = true;
        		}
        	}
        });        
    
    nasabtn.setOnClickListener(new OnClickListener()	{
    	public void onClick(View v){
    		if(strg){
    			MenuList.startAnimation(new CollapseAnimation(MenuList, 0,(int)(screenWidth*0.7), 20));
        		MenuList.setVisibility(View.INVISIBLE);
        		btnToggleMenuList.setClickable(true);
    			nasabtn.setClickable(false);
    			isExpanded = true;
    			strg = false;
    			startActivity(intent);
    		}else{
    			
    		}
    	}
    });
    }
    
    private void hideAllElements(){
    	MenuList.setVisibility(View.INVISIBLE);
        MenuList.startAnimation(new ExpandAnimation(MenuList, 0, 0, 0));
    }
    
    @Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}
}

Anschließend noch der Code vom Parser:

Code:

package com.example.nasadailyimage;

import java.io.IOException;
import java.io.InputStream;

import org.xml.sax.SAXException;



import android.sax.Element;
import android.sax.ElementListener;
import android.sax.EndTextElementListener;
import android.sax.RootElement;
import android.sax.StartElementListener;
import android.util.Xml;
import android.util.Xml.Encoding;

public class NasaParser {
	private String mTitle;
	private String mDescription;
	private String mDate;
	private String mImageUrl;

	/**
	 * @return the mTitle
	 */
	public String getmTitle() {
		return mTitle;
	}

	/**
	 * @return the mDescription
	 */
	public String getmDescription() {
		return mDescription;
	}

	/**
	 * @return the mDate
	 */
	public String getmDate() {
		return mDate;
	}

	/**
	 * @return the mImageUrl
	 */
	public String getmImageUrl() {
		return mImageUrl;
	}

	/**
	 * Parsing the rss-fees
	 * 
	 * @param is
	 *            inputstream
	 * @throws IOException
	 * @throws SAXException
	 */
	public void parse(InputStream is) throws IOException, SAXException {
		RootElement rss = new RootElement("rss");
		Element channel = rss.requireChild("channel");
		Element item = channel.requireChild("item");
		
		// preparing the parsing utility
		 item.setElementListener(new ElementListener() {
			public void end() {
				onItem(mTitle, mDescription, mDate, mImageUrl);
			}
			
			public void start(org.xml.sax.Attributes attributes) {
				// TODO Auto-generated method stub
				mTitle = mDescription = mDate = mImageUrl = null;
			}

			
		});
		item.getChild("title").setEndTextElementListener(
				new EndTextElementListener() {
					public void end(String body) {
						mTitle = body;
					}
				});
		item.getChild("description").setEndTextElementListener(
				new EndTextElementListener() {
					public void end(String body) {
						mDescription = body;
					}
				});
		item.getChild("pubDate").setEndTextElementListener(
				new EndTextElementListener() {
					public void end(String body) {
						mDate = body;
					}
				});
		item.getChild("enclosure").setStartElementListener(
				new StartElementListener() {
					

					public void start(org.xml.sax.Attributes attributes) {
						mImageUrl = attributes.getValue("", "url");
					}
				});
		// and now let's go ...
		Xml.parse(is, Encoding.UTF_8, rss.getContentHandler());
	}

	/**
	 * Have we found something? Only for logging!
	 * 
	 * @param title
	 * @param description
	 * @param date
	 * @param imageUrl
	 */
	public void onItem(String title, String description, String date,
			String imageUrl) {
		// This is where you handle the item in the RSS channel, etc. etc.
		// (Left as an exercise for the reader)
		System.out.println("title=" + title);
		System.out.println("description=" + description);
		System.out.println("date=" + date);
		// This needs to be downloaded for instance
		System.out.println("imageUrl=" + imageUrl);
	}
}

Manifest:

Code:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.nasadailyimage"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".NasaFeed"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
				
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MatthiasKramer · 2012-10-18T15:46:03+0200

Hi,
du hast die MainActivity nicht in der Manifest angegeben, füge den Code noch hinzu:

Code:

<activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
				
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

Und wieso hast du bei beiden Activitys die gleichen Layouts?
Fertige doch für die zweite Activity ein eigenes Layout an

Gruß

Blackscreen · 2012-10-18T16:42:35+0200

Danke für den Hinweis!

& eine Frage habe ich noch:

im Manifest

steht ja jetzt bei beiden: <action android:name="android.intent.action.MAIN" />

muss man da bei der sekundären noch etwas ändern?

MatthiasKramer · 2012-10-18T17:01:28+0200

das 2.Layout packst du in der 2.Activitity in die onCreate() Methode:

Code:

setContentView(R.layout.zweites_layout);

Zur manifest:
Bei der Activity, die die "StartActivity" sein soll, bzw. die MainActivity,lässt du beides drin, bei der zweiten Activity packst du den LAUNCHER raus

So, bin in den Ferien, byeeeee

panjutorials · 2012-10-26T20:35:18+0200

Dieses Tutorial sollte dir Helfen. Das wird schritt für Schritt gezeigt, wie man ein Menü erstellt und dabei spielt die OnClick() Methode eine rolle.

Android Tutorial - Menü

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