android - 如何使用 Intent Extras 传递可序列化对象数组？

Question

我想在不使用首选项的情况下传递一个对象数组我用 Intent!!!

对象类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
}

源 Activity ps:JSONParseBts 填充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> { ... }

}

和区别 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();                        


              }});

            }
        }

    }

错误是:

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

您可以使用包含 Serializable 数组的包装类，我刚刚对此进行了测试并且它有效。

首先，创建简单的包装器类:

import java.io.Serializable;

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

然后在Intent中传递Serializable包装类:

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);
        }
    });

然后，从 extras 中获取 Serializable 包装器，并提取数组:

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");
}