我有一些文本字段和一个按钮的视图。单击按钮后，我会看到一个列表视图。在那里我做了一些选择（存储在地图中），按下后退按钮后，我转到初始视图。当从视图中按下后退按钮时，它应将它们（映射值）和文本字段值存储到DB中。
然而，按下后退按钮在视图中定义。当我从列表视图中按下后退按钮时，视图中定义的按钮会被调用，但是当我从视图中按下它时，它不会被调用。如何过来呢？
btw我无法在列表视图中定义后退按钮调用..
有关如何解决此问题的任何想法？
编辑：
这是代码，
class PInfo {
String appname = "";
String pname = "";
Drawable icon;
}
public class InstalledApps extends Activity{
private static LayoutInflater inflater=null;
private ListView listview;
private Activity activity;
List<PInfo> installedApps = new ArrayList<PInfo>();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.applist);
activity = this;
listview = (ListView)findViewById(R.id.listView1);
PackageManager pm = getPackageManager();
List<ApplicationInfo> packages = pm.getInstalledApplications(PackageManager.GET_META_DATA);
for(ApplicationInfo app : packages) {
PInfo newInfo = new PInfo();
newInfo.appname = (String) app.loadLabel(pm);
newInfo.pname = app.packageName;
//newInfo.icon = app.icon;
//Drawable dd = activity.getResources().getDrawable(app.icon);
newInfo.icon = app.loadIcon(getPackageManager());
//System.out.println(android.os.Process.getUidForName(newInfo.pname));
if((app.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) == 1) {
installedApps.add(newInfo);
} else if ((app.flags & ApplicationInfo.FLAG_SYSTEM) == 1) {
installedApps.add(newInfo);
} else {
installedApps.add(newInfo);
}
}
InstalledAppsAdapter iap = new InstalledAppsAdapter(this, installedApps);
listview.setAdapter(iap);
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
System.out.println("Back Pressed");
//getSeletedApps()
}
}
class InstalledAppsAdapter extends BaseAdapter{
private Activity activity;
private static LayoutInflater inflater=null;
List<PInfo> installedApps = new ArrayList<PInfo>();
ListView listview;
Map<String, String> appselect = new HashMap<String, String>(10);
public InstalledAppsAdapter(Activity a, List<PInfo> b) {
// TODO Auto-generated constructor stub
installedApps = b;
activity = a;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
listview = (ListView)activity.findViewById(R.id.listView1);
}
public void onBackPressed() {
// TODO Auto-generated method stub
//super.onBackPressed();
System.out.println("Back Pressed1111111111");
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return installedApps.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
View customView = inflater.inflate(R.layout.listrow, arg2,false);
ImageView iv = (ImageView)customView.findViewById(R.id.imageView1);
TextView tv= (TextView) customView.findViewById(R.id.textView2);
CheckBox cb= (CheckBox)customView.findViewById(R.id.checkBox1);
final PInfo pinfo = installedApps.get(arg0);
tv.setText(""+pinfo.appname);//If u comment this line it works
Drawable dd;
/*if(pinfo.icon != 0){
System.out.println(pinfo.icon);
dd = activity.getResources().getDrawable(pinfo.icon);
}else{
dd = activity.getResources().getDrawable(R.drawable.ic_launcher);
}*/
iv.setImageDrawable(pinfo.icon);
cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked){
appselect.put(pinfo.pname, pinfo.appname);
//System.out.println("AAAAAAAAAAAAA "+pinfo.appname);
}else if(!isChecked){
appselect.remove(pinfo.pname);
//System.out.println("BBBBBBBBBBBBBBBB");
}
}
});
return customView;
}
public Map<String, String> getSeletedApps(){
return appselect;
}
}
我只能在InstalledApps类中定义backpress。 （可以在InstalledAppsAdapter类中定义吗？）但是当我在listview中时它会被调用。从listview返回后我有一些文本字段，当我从这里按回按钮时，我需要将值保存到DB（listview返回值+文本字段）。我无法检测到第二次背压......