How to use Intent Extras to pass Array of Serializ

Question

I want to pass an array of objects without using the preference I use Intent!!!

The Object class Bts

public class Bts implements Serializable {

        int idbts;
        String nombts;
        String ipaddress;
        String logb;
        String pawb;
        int xbts;
        int ybts;
        public  Bts(int idbts, String nombts, String ipaddress, String logb,
                String pawb, int xbts, int ybts) {
            super();
            this.idbts = idbts;
            this.nombts = nombts;
            this.ipaddress = ipaddress;
            this.logb = logb;
            this.pawb = pawb;
            this.xbts = xbts;
            this.ybts = ybts;
        }
        //wthis setter and getter
}

The source activity Ps:JSONParseBts filled listeBts.

public class ApresConnextionActivity extends Activity {

    public Bts[] listeBts;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        super.setContentView(R.layout.apresconnect);
        final Button btsButton = (Button) findViewById(R.id.btbts);
        //boutonbts
        btsButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {               

              Log.w("myApp",""+listeBts.length);
                Intent i = new Intent(ApresConnextionActivity.this, BtsBoutonActivity.class);
                i.putExtra("tabbts",listeBts);

                startActivity(i);


            }
        });
         new JSONParseBts().execute();
    }

    public class JSONParseBts extends AsyncTask<String, String, JSONObject> { ... }

}

And distination Activity:

    public class BtsBoutonActivity extends Activity {
        cellule[] listecellule;
        Bts[] listeBts;
        int i,xx=0;

        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            super.setContentView(R.layout.btsbouton);

            Bundle b = getIntent().getExtras();
            if (b != null)
            {
                Bts[] listeBts = (Bts[])b.getSerializable("tabbts") ;
                Log.w("myApp",""+listeBts.length);
            }else{
                Log.w("myApp","you have problem");
            }

        /*  Intent intent = getIntent();
            listeBts =  (Bts[])intent.getSerializableExtra("tabbts");*/

             final Button[] b = new Button[listeBts.length];
             LinearLayout ll3 = (LinearLayout)findViewById(R.id.linearLayout2); // Btn  

                for(i = 0; i < listeBts.length; i++){
                    //Log.w("myApp",listeBts[i].toString());
            b[i] = new Button(BtsBoutonActivity.this);
            b[i].setText(listeBts[i].getNombts());
             xx =listeBts[i].getIdbts();
            Log.w("myApp",""+xx);
            b[i].setId(xx);
            ll3.addView(b[i]);

            final Button btbts = (Button) findViewById(xx);
            btbts.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {

        Toast saved_message=Toast.makeText(BtsBoutonActivity.this,btbts.getText()+"  "+btbts.getId(),1);
              saved_message.show();                        


              }});

            }
        }

    }

The error is:

05-10 16:29:25.096: E/AndroidRuntime(819): java.lang.RuntimeException: Unable to start activity ComponentInfo{pfe.essat.com/pfe.essat.com.BtsBoutonActivity}: java.lang.ClassCastException: java.lang.Object[] cannot be cast to pfe.essat.objet.com.Bts[]

Answer 1

Create Constants.java

public class Constants {
    public static String BTS_EXTRA_KEY = "bts_extra";
}

Fix your Bts class to be like this

import android.os.Parcel;
import android.os.Parcelable;

public class Bts implements Parcelable {

    private String nombts;
    private String ipaddress;
    private String logb;
    private String pawb;

    private int idbts;
    private int xbts;
    private int ybts;

    public Bts(Parcel in) {
        // Construct from parcel
        String[] data = new String[4];
        int[] dataInt = new int[3];

        in.readStringArray(data);
        in.readIntArray(dataInt);

        nombts = data[0];
        ipaddress = data[1];
        logb = data[2];
        pawb = data[3];

        idbts = dataInt[0];
        xbts = dataInt[0];
        ybts = dataInt[0];
    }


    public Bts(int idbts, String nombts, String ipaddress, String logb, String pawb, int xbts, int ybts) {
        super();
        this.idbts = idbts;
        this.nombts = nombts;
        this.ipaddress = ipaddress;
        this.logb = logb;
        this.pawb = pawb;
        this.xbts = xbts;
        this.ybts = ybts;
    }

    public String getNombts() {
        return nombts;
    }

    public void setNombts(String nombts) {
        this.nombts = nombts;
    }

    public String getIpaddress() {
        return ipaddress;
    }

    public void setIpaddress(String ipaddress) {
        this.ipaddress = ipaddress;
    }

    public String getLogb() {
        return logb;
    }

    public void setLogb(String logb) {
        this.logb = logb;
    }

    public String getPawb() {
        return pawb;
    }

    public void setPawb(String pawb) {
        this.pawb = pawb;
    }

    public int getIdbts() {
        return idbts;
    }

    public void setIdbts(int idbts) {
        this.idbts = idbts;
    }

    public int getXbts() {
        return xbts;
    }

    public void setXbts(int xbts) {
        this.xbts = xbts;
    }

    public int getYbts() {
        return ybts;
    }

    public void setYbts(int ybts) {
        this.ybts = ybts;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel parcel, int i) {
        parcel.writeStringArray(new String[]{nombts, ipaddress, logb, pawb});
        parcel.writeIntArray(new int[]{idbts, xbts, ybts});
    }

    public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {
        public Bts createFromParcel(Parcel in) {
            return new Bts(in);
        }

        public Bts[] newArray(int size) {
            return new Bts[size];
        }
    };
}

Now to pass this data to another activity, you must have the data in an ArrayList

public void onBtnClick(View v){
    Intent i = new Intent(MainActivity.this, SecondActivity.class);
    ArrayList<Bts> listOfBts = new ArrayList<Bts>();
    listOfBts.add(new Bts(123, "323", "23423", "3423", "frlaldf", 45, 324));
    listOfBts.add(new Bts(124, "323", "23423", "3423", "frlaldf", 45, 324));
    listOfBts.add(new Bts(125, "323", "23423", "3423", "frlaldf", 45, 324));
    listOfBts.add(new Bts(126, "323", "23423", "3423", "frlaldf", 45, 324));
    listOfBts.add(new Bts(127, "323", "23423", "3423", "frlaldf", 45, 324));
    listOfBts.add(new Bts(128, "323", "23423", "3423", "frlaldf", 45, 324));
    i.putParcelableArrayListExtra(Constants.BTS_EXTRA_KEY, listOfBts);
    startActivity(i);
}

And in the other activity

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    printBts();
}

private void printBts(){
    Bundle extras = getIntent().getExtras();
    ArrayList<Bts> btsList = extras.getParcelableArrayList(Constants.BTS_EXTRA_KEY);

    for(Bts b : btsList){
        Log.d("SecondActivity", ""  + b.getIdbts());
    }
}

Result:

05-10 21:14:51.414  19703-19703/si.kseneman.btstest D/SecondActivity﹕ 123
05-10 21:14:51.414  19703-19703/si.kseneman.btstest D/SecondActivity﹕ 124
05-10 21:14:51.414  19703-19703/si.kseneman.btstest D/SecondActivity﹕ 125
05-10 21:14:51.414  19703-19703/si.kseneman.btstest D/SecondActivity﹕ 126
05-10 21:14:51.414  19703-19703/si.kseneman.btstest D/SecondActivity﹕ 127
05-10 21:14:51.414  19703-19703/si.kseneman.btstest D/SecondActivity﹕ 128

Answer 2

You can use a wrapper class that contains the Serializable array, I just tested this and it works.

First, create your simple wrapper class:

import java.io.Serializable;

public class BtsWrapper implements Serializable{
    Bts[] array;
    public BtsWrapper(Bts[] a){
        array = a;
    }
}

Then pass the Serializable wrapper class in the Intent:

btsButton.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {               

            Log.w("myApp",""+listeBts.length);
            Intent i = new Intent(ApresConnextionActivity.this, BtsBoutonActivity.class);
            BtsWrapper bWrapper = new BtsWrapper(listeBts); //added

            i.putExtra("tabbts",bWrapper); //modified

            startActivity(i);
        }
    });

Then, get the Serializable wrapper from the extras, and just extract the array:

Bundle b = getIntent().getExtras();
if (b != null)
{
    //Bts[] listeBts = (Bts[])b.getSerializable("tabbts") ;
    BtsWrapper bWrapper = (BtsWrapper) b.getSerializable("tabbts"); //added
    Bts[] listeBts = bWrapper.array; //added
    Log.w("myApp",""+listeBts.length);
}else{
    Log.w("myApp","you have problem");
}

Answer 3

I believe there is no such putExtra API existent that accepts Array of some Serializable objects. See http://developer.android.com/reference/android/content/Intent.html#putCharSequenceArrayListExtra(java.lang.String, java.util.ArrayList) onwards. There is also no getter available for extracting Array of some Serializable objects from Intent.

You could perhaps make your Bts class Parcelable and use public Intent putExtra (String name, Parcelable[] value) instead.