Conversion to Dalvik format failed with error 1" Error in ANDROID / Eclipse.

This is a normal error when you import some project into eclipse.
I will show you how to solve this

First try cleaning the project from project->Clean.
If this didn’t work, then try these


 Follow these steps
1. Go to Project » Properties » Java Build Path » Libraries and remove all except the “Android X.Y” (eg: Android 1.5). click OK.
2. Go to Project » Clean » Clean projects selected below » select your project and click OK.

Now your error may be gone.
Happy coding…

ImageSwitcher View in android

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ff000000"
    >

    <ImageSwitcher
        android:id="@+id/switcher1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"                
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"    
        />
    <Gallery
        android:id="@+id/gallery1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"      
        />

</RelativeLayout>
Modify the DisplayViewsExample.java file as shown below:
package net.learn2develop.AndroidViews;

import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.Gallery.LayoutParams;
import android.widget.ViewSwitcher.ViewFactory;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;

public class DisplayViewsExample extends Activity
implements ViewFactory
{  
    //---the images to display---
    Integer[] imageIDs = {
            R.drawable.pic1,
            R.drawable.pic2,
            R.drawable.pic3,
            R.drawable.pic4,
            R.drawable.pic5,
            R.drawable.pic6,
            R.drawable.pic7                  
    };

    private ImageSwitcher imageSwitcher;

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

        imageSwitcher = (ImageSwitcher) findViewById(R.id.switcher1);
        imageSwitcher.setFactory(this);
        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_in));
        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_out));

        Gallery gallery = (Gallery) findViewById(R.id.gallery1);
        gallery.setAdapter(new ImageAdapter(this));
        gallery.setOnItemClickListener(new OnItemClickListener()
        {
            public void onItemClick(AdapterView parent,
            View v, int position, long id)
            {              
             imageSwitcher.setImageResource(imageIDs[position]);
            }
        });
    }

    public View makeView()
    {
        ImageView imageView = new ImageView(this);
        imageView.setBackgroundColor(0xFF000000);
        imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
        imageView.setLayoutParams(new
                ImageSwitcher.LayoutParams(
                        LayoutParams.FILL_PARENT,
                        LayoutParams.FILL_PARENT));
        return imageView;
    }

    public class ImageAdapter extends BaseAdapter
    {
        private Context context;
        private int itemBackground;

        public ImageAdapter(Context c)
        {
            context = c;

            //---setting the style---              
            TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
            itemBackground = a.getResourceId(
                    R.styleable.Gallery1_android_galleryItemBackground, 0);
            a.recycle();                                                  
        }

        //---returns the number of images---
        public int getCount()
        {
            return imageIDs.length;
        }

        //---returns the ID of an item---
        public Object getItem(int position)
        {
            return position;
        }

        public long getItemId(int position)
        {
            return position;
        }

        //---returns an ImageView view---
        public View getView(int position, View convertView, ViewGroup parent)
        {
            ImageView imageView = new ImageView(context);
            imageView.setImageResource(imageIDs[position]);
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            imageView.setLayoutParams(new Gallery.LayoutParams(150, 120));
            imageView.setBackgroundResource(itemBackground);
            return imageView;
        }
   }  
    }
Observe that the DisplayViewsExample class now implements the ViewFactory class. The ViewFactory class creates the views in a ViewSwitcher view. When your class implements the ViewFactory class, you need to override the makeView() method, which creates a new View to be added in a ViewSwitcher.
Press F11 in Eclipse and observe the ImageSwitcher in action as shown in Figure 13.

Android DisplayMetrics

Get screen resolution using android.util.DisplayMetrics
android.util.DisplayMetrics is a structure describing general information about a display, such as its size, density, and font scaling.

To use android.util.DisplayMetrics to get resolution:

Create a dummy Android Application, add a TextView in main.xml to display the result.

<TextView
android:id="@+id/strScreenSize"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=""
/>

Modify the .java file to read DisplayMetrics

package com.exercise.AndroidScreen;

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

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

        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        String str_ScreenSize = "The Android Screen is: "
                    + dm.widthPixels
                    + " x "
                    + dm.heightPixels;

        TextView mScreenSize = (TextView) findViewById(R.id.strScreenSize);
        mScreenSize.setText(str_ScreenSize);
 }
}

Install Android APK Programmatically

To install app programmatically use following code, you'll need user permissions though.

Intent promptInstall = new Intent(Intent.ACTION_VIEW)
    .setData(Uri.parse("file:///path/to/your.apk"))
    .setType("application/vnd.android.package-archive";
startActivity(promptInstall);

Map Not display in Android

Solution

The MD5 Fingerprint of Your Signing Certificate Should Be provided in your Main.xml

To register for a Maps API Key, you need to provide an MD5 fingerprint of the certificate that you will use to sign your application. Before you visit the registration page, use Keytool to generate the fingerprint of the appropriate certificate. 

First, if you are testing the application on the Android emulator, locate the SDK debug certificate located in the default folder of "C:\Documents and Settings\\Local Settings\Application Data\.android". The filename of the debug keystore is debug.keystore. For deploying to a real Android device, substitute the debug.keystore file with your own keystore file.

Using the debug keystore, you need to extract its MD5 fingerprint using the Keytool.exe application included with your JDK installation. This fingerprint is needed to apply for the free Google Maps key. You can usually find the Keytool.exe from the "C:\Program Files\Java\\bin" folder.

Issue the following command to extract the MD5 fingerprint.

C:\Program Files\Java\jdk1.6.0_14\bin>keytool -list -alias androiddebugkey -keystore "c:\Documents and Settings\check\.android\debug.keystore" -storepass android -keypass android

Set background of your app to be transparent

To set background of your app to be transparent, you can use Android pre-defined Theme.Translucent.

Modify AndroidManifest.xml, to add the code inside <activity>
android:theme="@android:style/Theme.Translucent"

example:




Xml file



<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.AndroidTranslucent"
    android:versionCode="1"
    android:versionName="1.0">
  <uses-sdk android:minSdkVersion="4" />

  <application android:icon="@drawable/icon" android:label="@string/app_name">
      <activity android:name=".AndroidTranslucent"
                android:label="@string/app_name"
                android:theme="@android:style/Theme.Translucent">
          <intent-filter>
              <action android:name="android.intent.action.MAIN" />
              <category android:name="android.intent.category.LAUNCHER" />
          </intent-filter>
      </activity>

  </application>
</manifest>

Android Unzip Example

Android Unzip the file in SD-Card
Below i write the code  for Download zip file from application server and Unzip to SD-Card. I Hope it will useful for you.

Activity Code:

/**
* @author Arun kumar
*/
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Calendar;
import java.util.Enumeration;
import java.util.Random;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class AndroidQAActivity extends Activity {
private static Random random = new Random(Calendar.getInstance().getTimeInMillis());
private ProgressDialog mProgressDialog;
String unzipLocation = Environment.getExternalStorageDirectory() + "/Extract location Folder Name/Extracted Downloaded File";
String zipFile =Environment.getExternalStorageDirectory() "+/download zip file";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.main);
DownloadMapAsync mew = new DownloadMapAsync();
mew.execute("Here Your Zip File Url");
}
class DownloadMapAsync extends AsyncTask<String, String, String> {
String result ="";
@Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog = new ProgressDialog(AndroidQAActivity.this);
mProgressDialog.setMessage("Downloading Zip File..");
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setCancelable(false);
mProgressDialog.show();
}
@Override
protected String doInBackground(String... aurl) {
int count;
try {
URL url = new URL(aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(zipFile);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
output.write(data, 0, count);
}
output.close();
input.close();
result = "true";
} catch (Exception e) {
result = "false";
}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC",progress[0]);
mProgressDialog.setProgress(Integer.parseInt(progress[0]));

}
@Override
protected void onPostExecute(String unused) {
mProgressDialog.dismiss();
if(result.equalsIgnoreCase("true")){
try {
unzip();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else{
}
}
}
public void unzip() throws IOException {
mProgressDialog = new ProgressDialog(AndroidQAActivity.this);
mProgressDialog.setMessage("Please Wait...Extracting zip file ... ");
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
mProgressDialog.setCancelable(false);
mProgressDialog.show();
new UnZipTask().execute(zipFile, unzipLocation);
}
private class UnZipTask extends AsyncTask<String, Void, Boolean> {
@SuppressWarnings("rawtypes")
@Override
protected Boolean doInBackground(String... params) {
String filePath = params[0];
String destinationPath = params[1];
File archive = new File(filePath);
try {
ZipFile zipfile = new ZipFile(archive);
for (Enumeration e = zipfile.entries(); e.hasMoreElements();) {
ZipEntry entry = (ZipEntry) e.nextElement();
unzipEntry(zipfile, entry, destinationPath);
}
UnzipUtil d = new UnzipUtil(zipFile, unzipLocation);
d.unzip();

} catch (Exception e) {

return false;
}
return true;

}
@Override
protected void onPostExecute(Boolean result) {
mProgressDialog.dismiss();
}

private void unzipEntry(ZipFile zipfile, ZipEntry entry,
String outputDir) throws IOException {
if (entry.isDirectory()) {
createDir(new File(outputDir, entry.getName()));
return;

}
File outputFile = new File(outputDir, entry.getName());
if (!outputFile.getParentFile().exists()) {
createDir(outputFile.getParentFile());
}

// Log.v("", "Extracting: " + entry);
BufferedInputStream inputStream = new BufferedInputStream(zipfile.getInputStream(entry));
BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(outputFile));
try {

} finally {

outputStream.flush();
outputStream.close();
inputStream.close();
}
}
private void createDir(File dir) {
if (dir.exists()) {
return;
}

if (!dir.mkdirs()) {
throw new RuntimeException("Can not create dir " + dir);

}

}}

}
Screen Shot