Android的使用权和修改不同的布局 [英] Android use and modify a different layout

问题描述

我需要和活动有一个ListView，显示安装的所有应用程序，它的名称，图标和一个开关，这样当您单击该项目的开关状​​态的改变，它必须存储与共享preferences。我已经使用这个例子，然后加上 snippet_list_row.xml 的开关。为了改变和存储交换机的地位，从来就改变了 AllAppsActivity.java 来：

I need to make and activity with a listview which shows all the apps installed, its name, icon and a switch so that when you click the item the switch state change and it has to be stored with sharedpreferences. I have used this example and then add a switch on snippet_list_row.xml. For changing and storing the status of the switch, i´ve changedAllAppsActivity.java to:

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    ApplicationInfo app = applist.get(position);
    Switch appSwitch = (Switch) findViewById(R.id.app_switch);
    if (appSwitch.isChecked()){
        appSwitch.setChecked(false);
    }else{
        appSwitch.setChecked(true);
    }
    PreferenceManager.getDefaultSharedPreferences(AppsNotificationsActivity.this).edit().putString(app.packageName , String.valueOf(appSwitch.isChecked())).commit();
}

但doesn't商店或改变开关状态，一个我认为这可能是因为它是不活动的布局中。所以，我怎么能解决这个问题？
谢谢！

But it doesn´t store or change the switch status, an I think it could be because it is not inside the activity layout. So, how could I fix it?? Thanks!

推荐答案

尝试是这样的：

在您A​​llAppsActivity.java的onCreate方法，增加code这行：

In the onCreate method of your AllAppsActivity.java, add this lines of code:

setListAdapter(new CustomArrayAdapter(this, arrayOfApps ,arrayOfAppIcons));

其中 arrayOfApps 为String（应用程序名称）和 arrayOfAppIcons阵列是相应的应用程​​序图标的排列。

where arrayOfApps is an array of String (app names) and arrayOfAppIcons is array of corresponding app icons.

然后创建code为CustomArrayAdapter.java：

Then create the code for CustomArrayAdapter.java:

public class CustomArrayAdapter extends ArrayAdapter<String> {
private final Context context;
private final String [] appnames;
private final IconType [] appicons; //Replace IconType by your icon images' datatype


public CustomArrayAdapter(Context context, String[] appnames,IconType[] appicons ) {
    super(context, R.layout.app_list_item_layout, appnames);
    this.context = context;
    this.appnames = appnames;
    this.appicons = appicons;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    View rowView = inflater.inflate(R.layout.app_list_item_layout, parent, false);

//The following variables are references to the elements within each list item displayed (in app_list_item_layout xml file)
    TextView appNameView = (TextView) rowView.findViewById(R.id.appName);
    ImageView appIconView = (ImageView)  rowView.findViewById(R.id.appIcon);      
//If you are using something else to dislay app icons, replace ImageView by corresponding datatype
    Switch appSwitch = (Switch) rowView.findViewById(R.id.app_switch);


    rowView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            // Do whatever u want here on any List item click
            // the variable "position" indicates which particular list item was clicked
        }
    });



    return rowView;
}

}

请注意， app_list_item_layout.xml 是定义布局样式布局xml文件的列表中的每个项目的。

Note, app_list_item_layout.xml is a layout xml file where you define the layout style for each item in your list.

在您A​​llAppsActivity.java的onCreate（）方法，你应该布局设置为您的主布局的xml文件。

In the onCreate() method of your AllAppsActivity.java, you should set the layout to your main layout xml file.

您不需要使用此之后，使用您的onListItemClick方法。

You don't need to use your onListItemClick method after using this.

编辑：在主布局的xml文件，你应该有一个ListView元素。让其ID为 APPLIST 。于是就把这个code片段在的onCreate（）的你AllAppsActivity.java的方法：

In your main layout xml file, you should have a ListView element. Let its id be appList. So then put this code snippet in the onCreate() method of your AllAppsActivity.java:

appListView = (ListView)findViewById(R.id.appList); //appList element exists in your main layout xml file for your activity
appListView.setItemsCanFocus(true);
appListView.setAdapter(new CustomArrayAdapter(this, arrayOfApps ,arrayOfAppIcons));

较早code我提到的是一个更广义的版本，但你应该在你的AllAppsActivity.java使用这个编辑code。

The earlier code I mentioned is a more generalized version, but you should use this edited code in your AllAppsActivity.java.

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