当我尝试访问捆绑软件中的信息时，为什么我的Android活动被强制关闭？

Question

I am writing an Android app. One of the activities is a ListActivity, so when the person selects an item in the list I would like the text value of that item to be stored in the Intent/Bundle so that the next activity knows that value. My code looks something like this:

lv.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView parent, View view,
            int position, long id) {

            Intent intent = new Intent(view.getContext(), FavoriteEditFromDest.class);
            intent.putExtra("com.example.myapp.Name", ((TextView) view).getText());

            startActivity(intent);
        }
      });
    }

The onCreate method for the activity that is to be started looks like this:

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.favorite_dest_edit);

            // nameB is a global string variable defined above.
        nameB = savedInstanceState.getString("com.example.myapp.Name");
    }

When I click an item from the list in the ListActivity, it begins to execute the onCreate code, but when it gets to the line that tries to retrieve the string value I get a force close dialog.

I don't have much experience passing information with a Bundle, so I would appreciate any and all help!

Answer 1

nameB = savedInstanceState.getString("com.example.myapp.Name");

should be replaced with

Bundle bundle = getIntent().getExtras();
nameB = bundle.getString("com.example.myapp.Name");

try that out and see if it helps.

Answer 2

Use adb logcat , DDMS, or the DDMS perspective in Eclipse to examine your stack trace and see the exception that triggered your "force close".

In this case, I suspect that you will find that what you put into the Bundle is not a String , since getText() does not return a String . However, that is just a guess -- your stack trace should tell you more.

Answer 3

Among other problems

intent.putExtra("com.example.myapp.Name", ((TextView) view).getText());

Should be

intent.putExtra("com.example.myapp.Name", ((TextView) view).getText().toString());