Need to show the result of the selected item in my ListView to my button

Question

I Have a problem:

i have a button that when i click is calling another screen and in this screen i have ListView i went to insert in my button the result of the selected item of my ListView

someone have an idea how to do that?

Thanks for your help!!!

Answer 1

You should use , StartActivityForResult() to call another activity and get the result from second Activity to firstActivity.
Check this link
http://developer.android.com/guide/appendix/faq/commontasks.html

search for "Returning a Result from a Screen" in that page. That should help you.

Answer 2

You should override method onActivityResult (int requestCode, int resultCode, Intent data) in your first activity and start the second screen via startActivityForResult (Intent intent, int requestCode) . When you select the item in list view pass the result via setResult (int resultCode, Intent data) (put data into intent - putExtra method). You can get result from intent, which passed into onActivityResult in first activity UPDATE manifest <application> section

<application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".test1"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="test1.pack.test2">
            <intent-filter>
                <category android:name="android.intent.category.DEFAULT"></category>
                <action android:name="test1.act2.START"></action>
            </intent-filter>
        </activity>
    </application>

Screen layout

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<Button android:text="Button" 
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:id="@+id/btn"
android:onClick="onBtnClick"></Button>
</LinearLayout>

1st activity code

public class test1 extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    public void onBtnClick(View view){
        Intent i = new Intent("test1.act2.START");
        i.putExtra("btnText", "Hello, from activity 1");
        startActivityForResult(i, 0);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (data.hasExtra("response")){
            Button b = (Button)findViewById(R.id.btn);
            CharSequence seq = data.getCharSequenceExtra("response");
            b.setText(seq);
        }
    }
}

2nd activity code

public class test2 extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button b = (Button)findViewById(R.id.btn);
        b.setText(getIntent().getStringExtra("btnText"));
    }
    public void onBtnClick(View view){
        Intent i = new Intent();
        i.putExtra("response", "Response from second");
        setResult(Activity.RESULT_OK, i);
        finish();
    }
}

Answer 3

If the other activity is just for the listing of options I suggest you use a spinner in your first activity itself. : http://developer.android.com/reference/android/widget/Spinner.html