活动

Question

我的目标是在自定义列表视图中显示已安装的应用列表（在活动中），而不会取消选中复选框（滚动列表视图时）。

问题：滚动列表视图时，复选框的选中状态将取消选中。

我的进展到目前为止：虽然this blog entry清楚地显示了如何摆脱listview中未选中复选框的问题，但区别在于它使用 Model 作为自定义类，而在我的情况下它是一个系统类[即packageList1 = packageManager.getInstalledPackages（0）;]

我该如何解决这个问题？下面是我的代码尝试。我能够使用复选框在listviw中成功显示应用程序，只是在滚动列表视图时检查状态是未选中的。

我打开任何一种方法作为答案，这将使我能够在一个LISTVIEW中显示安装的应用程序列表，而不会检查已经检查过的复选框的状态

我的自定义Listadapter类：

public class Listadapter extends BaseAdapter {

private static String TAG = "focus";
List<PackageInfo> packageList;
Activity context;
PackageManager packageManager;
boolean[] itemChecked;

List<String> appNamestoBlock_local;

public Listadapter(Activity context, List<PackageInfo> packageList,
        PackageManager packageManager, List<String> appNamestoBlock) {
    super();
    this.context = context;
    this.packageList = packageList;
    this.packageManager = packageManager;
    this.appNamestoBlock_local = appNamestoBlock;

    itemChecked = new boolean[packageList.size()];
}

private String getSerializedBlockedAppNames() {
    String serializedBlockedAppNames;
    Log.v(TAG,
            "-------- List<String> list = "
                    + TextUtils.join(",", appNamestoBlock_local));
    serializedBlockedAppNames = TextUtils.join(",", appNamestoBlock_local);
    return serializedBlockedAppNames;
}

private class ViewHolder {
    TextView apkName;
    CheckBox ck1;
}

public int getCount() {
    return packageList.size();
}

public Object getItem(int position) {
    return packageList.get(position);
}

public long getItemId(int position) {
    return 0;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;

    LayoutInflater inflater = context.getLayoutInflater();

    if (convertView == null) {
        convertView = inflater.inflate(R.layout.list_item, null);
        holder = new ViewHolder();

        holder.apkName = (TextView) convertView
                .findViewById(R.id.textView1);
        holder.ck1 = (CheckBox) convertView.findViewById(R.id.checkBox1);

        holder.ck1.setFocusable(false);
        convertView.setTag(holder);

    } else {

        holder = (ViewHolder) convertView.getTag();
    }

    PackageInfo packageInfo = (PackageInfo) getItem(position);

    Drawable appIcon = packageManager
            .getApplicationIcon(packageInfo.applicationInfo);
    String appName = packageManager.getApplicationLabel(
            packageInfo.applicationInfo).toString();
    appIcon.setBounds(0, 0, 40, 40);
    holder.apkName.setCompoundDrawables(appIcon, null, null, null);
    holder.apkName.setCompoundDrawablePadding(15);
    holder.apkName.setText(appName);
    holder.ck1.setChecked(false);

    if (itemChecked[position])
        holder.ck1.setChecked(true);
    else
        holder.ck1.setChecked(false);

    // Log.v(TAG,
    // "-------- checking in getView() in ListAdapter if appName is in getSerializedBlockedAppNames()");
    if (getSerializedBlockedAppNames().contains(appName)) {
        Log.v(TAG + " ListAdapter",
                "-------- YES, appName is in getSerializedBlockedAppNames(), appName = "
                        + appName);
        holder.ck1.setChecked(true);
    }

    holder.ck1.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {
            if (isChecked) {
                itemChecked[position] = true;
            } else {
                itemChecked[position] = false;
            }
        }
    });

    return convertView;

}

}

在我的主要活动的onCreate函数中：

PackageManager packageManager = getPackageManager();
List<PackageInfo> packageList1 = packageManager.getInstalledPackages(0);

Listadapter Adapter = new Listadapter(MainActivityCircularSeekbar.this, packageList1, packageManager, blockedApps);

Answer 1

活动

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.os.Bundle;
import android.widget.ListView;

public class AppScreen extends Activity {
private ListView list;
ArrayList<Datamodel> res;
MyAdapter _adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.app_screen);

    list = (ListView) findViewById(R.id.list);
    List<PackageInfo> _myapps = getPackageManager().getInstalledPackages(0);
    res = new ArrayList<Datamodel>();
    for (int i = 0; i < _myapps.size(); i++) {
        PackageInfo p = _myapps.get(i);

        Datamodel _model  = new Datamodel();
        _model.setAppname(p.applicationInfo.loadLabel(getPackageManager()).toString());
        res.add(_model);
        System.out.println("ajajajja" + res.size() + res.get(i).getAppname());
    }
    _adapter = new MyAdapter(getApplicationContext(), res);
    _adapter.notifyDataSetChanged();
    list.setAdapter(_adapter);


}

}

Datamodel类

public class Datamodel {

public String appname = "";
private boolean selected;

public String getAppname() {
    return appname;
}

public void setAppname(String appname) {
    this.appname = appname;
}

public boolean isSelected() {
    return selected;
}

public void setSelected(boolean isChecked) {
    this.selected = isChecked;
}

}

适配器类

public class MyAdapter extends BaseAdapter {
Context _ctx;
LayoutInflater inflater;
public ArrayList<Datamodel> data;

public MyAdapter(Context c, ArrayList<Datamodel> _arraylist) {
    this._ctx = c;
    this.data = _arraylist;
}

@Override
public int getCount() {
    return data.size();
}

@Override
public Object getItem(int position) {
    return position;
}

@Override
public long getItemId(int position) {
    return 0;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    inflater = (LayoutInflater) _ctx.getApplicationContext()
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View itemView = inflater.inflate(R.layout.inflator, parent, false);
    final CheckBox checks = (CheckBox) itemView.findViewById(R.id.b);
    final TextView _setappname = (TextView) itemView.findViewById(R.id.a);
    checks.setChecked(data.get(position).isSelected());

    Datamodel obj = data.get(position);
    _setappname.setText(obj.getAppname());
    checks.setTag(position);

    checks.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {                    
            int getPosition = (Integer) buttonView.getTag();
            Datamodel _obj = data.get(getPosition);
            data.get(position).setSelected(isChecked);
            String ss = _obj.getAppname();
            System.out.println("pos is" + getPosition);

        }
    });

    return itemView;
}

}

活动XML

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.installedapps.AppScreen" >

<ListView 
    android:id="@+id/list"
    android:layout_height="fill_parent"
    android:layout_width="fill_parent">

</ListView>

Inflator xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center"
android:layout_gravity="center"
android:orientation="horizontal"
android:weightSum="2" >

<TextView
    android:id="@+id/a"
    android:layout_width="0dp"
    android:layout_height="fill_parent"
    android:textColor="#000"
    android:layout_gravity="center"
    android:gravity="center"
    android:layout_weight="1.7" />

<CheckBox
    android:id="@+id/b"
    android:layout_width="0dp"
     android:layout_gravity="center"
    android:gravity="center"
    android:layout_weight="0.3"
    android:layout_height="wrap_content" />

</LinearLayout>

如果在列表视图滚动时没有选中Checkbox，列表视图中的已安装应用列表如何显示？

1 个答案:

活动

Datamodel类

适配器类

活动XML

Inflator xml