app与其它应用的交互

1.例如，下面是一个启动activity来选择联系人的例子：

static final int PICK_CONTACT_REQUEST = 1;  // The request code
...
private void pickContact() {
    Intent pickContactIntent = new Intent(Intent.ACTION_PICK, Uri.parse("content://contacts"));
    pickContactIntent.setType(Phone.CONTENT_TYPE); // Show user only contacts w/ phone numbers
    startActivityForResult(pickContactIntent, PICK_CONTACT_REQUEST);
}

2.查看网页:

     Uri webpage = Uri.parse("http://www.android.com");

Intent webIntent = new Intent(Intent.ACTION_VIEW, webpage);

  startActivity(webIntent);