CODEWITHSUNDEEP
androidandroid-studioandroid-intenthash
Abdul
Abdul

Reputation: 1607

passing hash map to an intent

I am getting a user input from two text fields and storing them into a hash map. I have checked to see if the values are being inserted correctly to the hash map. and they are. once I try to pass it using Intent.putExtra, I am getting this error.

Unable to start activity ComponentInfo{com.example.test.retrofit/com.example.test.retrofit.SearchActivity}: java.lang.ClassCastException: java.lang.String cannot be cast to java.util.HashMap
                                                                                 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3253)
                                                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
                                                                                 at android.app.ActivityThread.access$1100(ActivityThread.java:221)
                                                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                 at android.os.Looper.loop(Looper.java:158)
                                                                                 at android.app.ActivityThread.main(ActivityThread.java:7225)
                                                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
                                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
                                                                              Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.util.HashMap
                                                                                 at com.example.abdulhakim.retrofit.SearchActivity.onCreate(SearchActivity.java:42)
                                                                                 at android.app.Activity.performCreate(Activity.java:6876)
                                                                                 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
                                                                                 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
                                                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349) 
                                                                                 at android.app.ActivityThread.access$1100(ActivityThread.java:221) 
                                                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                 at android.os.Looper.loop(Looper.java:158) 
                                                                                 at android.app.ActivityThread.main(ActivityThread.java:7225) 
                                                                                 at java.lang.reflect.Method.invoke(Native Method) 
                                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
                                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

here is my code in MainActivity:

Map<String, String> data = new HashMap<String,String>();
input1 = (EditText) findViewById(R.id.term);
    input2 = (EditText) findViewById(R.id.column);
    ImageView =(ImageButton)findViewById(R.id.search);
    ImageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(MainActivity.this, SearchActivity.class);
            k=input1.getText().toString();
            t= input2.getText().toString();
            data.put("key",k);
            data.put("term",t);
            Log.v("HashMapTest KEY", data.get("key"));
            Log.v("HashMapTest TERM", data.get("term"));

            intent.putExtra("hash",data);
            startActivity(intent);

        }
    });

and here is my second activity:

Intent intent = getIntent();
    HashMap<String, String> data = (HashMap<String, String>)intent.getSerializableExtra("hash");


    if (data.isEmpty()) {
        Toast.makeText(getApplicationContext(), "nope! I didnt get the hashmap", Toast.LENGTH_LONG).show();
        return;
    }

Upvotes: 0

Views: 2771

Answers (3)

rafsanahmad007
rafsanahmad007

Reputation: 23881

try this: in your First activity:

HashMap<String, String> data = new HashMap<String,String>();  //initialize properly

Intent intent = new Intent(MainActivity.this, SearchActivity.class);
intent.putExtra("hashMap", data);
startActivity(intent);

Now in second Activity Get data using:

Intent intent = getIntent();    
HashMap<String, String> hashMap = (HashMap<String, String>) intent.getSerializableExtra("hashMap");
String key = hashMap.get("key");
Sting term = hashMap.get("term");

problem lies in your Second activity you are trying to cast String to a Hashmap

Upvotes: 0

Chirag.T
Chirag.T

Reputation: 756

This is pretty simple, All Collections objects implement Serializable (sp?) interface which means they can be passed as Extras inside Intent

Use putExtra(String key, Serializable obj) to insert the HashMap and on the other Activity use getIntent().getSerializableExtra(String key), You will need to Cast the return value as a HashMap though.

Upvotes: 0

Rajkumar Kumawat
Rajkumar Kumawat

Reputation: 290

use this

   intent.putExtra("hash",data.toString());

OR

   intent.putSerializableExtra("hash",data)

Upvotes: 1

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