问题显示所有已安装的应用程序一个ListView和实施OnItemClickListener [英] Issues Displaying a ListView of All Installed Apps and Implementing an OnItemClickListener

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问题描述

我想写一个非常简单的应用程序,显示设备的列表视图上每个已安装的应用程序的名称。我使用谷歌的ListView的教程为基础。

下面是我的code:

  @覆盖
    公共无效的onCreate(包savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        最终PackageManager下午= this.getPackageManager();

        意向意图=新的意图(Intent.ACTION_MAIN,NULL);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);

        最后的ArrayList< ResolveInfo>名单=
                (ArrayList的< ResolveInfo>)pm.queryIntentActivities(意向,
                        PackageManager.PERMISSION_GRANTED);
        对于(ResolveInfo rInfo:名单)
        {
            Log.i(TAG:安装的应用程序+ rInfo.activityInfo。
                    applicationInfo.loadLabel(下午)的ToString());
        }

        最后ArrayAdapter< ResolveInfo>适配器=
            新的ArrayAdapter< ResolveInfo>(这一点,R.layout.list_item,列表)
            {
            @覆盖
            公共查看getView(INT位置,查看convertView,父母的ViewGroup)
            {
                如果(convertView == NULL)
                    convertView = LayoutInflater.from(parent.getContext())。
                        膨胀(R.layout.list_item,父母,假);

                最后字符串文本= list.get(位置).activityInfo。
                    applicationInfo.loadLabel(PM)的ToString();
                ((TextView中)convertView.findViewById(R.id.text))的setText(文本)。

                最终绘制对象绘制= list.get(位置).activityInfo.applicationInfo.loadIcon(PM);
                ((ImageView的)convertView.findViewById(R.id.image))setImageDrawable(绘制);

                返回convertView;
            }

            };
        setListAdapter(适配器);

        ListView的LV = getListView();
        lv.setTextFilterEnabled(真正的);
        lv.setOnItemClickListener(新OnItemClickListener(){
            公共无效onItemClick(适配器视图<>母公司视图中查看,
                INT位置,长的id){

                //在项目点击活动
                //这是我想送选择要传递给方法的应用程序的包名。


            }
          });
    }




 < XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:方向=横向机器人:layout_width =FILL_PARENT
    机器人:layout_height =FILL_PARENT>
    < ImageView的机器人:ID =@ + ID /图像
        机器人:layout_width =50dp机器人:layout_height =50dp/>
    < TextView的机器人:ID =@ + ID /文
        机器人:layout_width =FILL_PARENT机器人:layout_height =WRAP_CONTENT
        机器人:填充=10dp机器人:TEXTSIZE =16SP/>
< / LinearLayout中>
 

更新:我现在需要使用OnItemClickListener传递应用程序的包名称选择的方法

解决方案

要在列表中正确显示你的活动的名字,你应该重写的 getView 方法,你的 ListAdapter ,并设置一些本地变量为最终(与内部类工作):

  @覆盖
公共无效的onCreate(包savedInstanceState)
{
    super.onCreate(savedInstanceState);

    最终PackageManager下午= this.getPackageManager();

    意向意图=新的意图(Intent.ACTION_MAIN,NULL);
    intent.addCategory(Intent.CATEGORY_LAUNCHER);

    最后的ArrayList< ResolveInfo>名单=
            (ArrayList的< ResolveInfo>)pm.queryIntentActivities(意向,
                    PackageManager.PERMISSION_GRANTED);
    对于(ResolveInfo rInfo:名单)
    {
        Log.i(TAG:安装的应用程序+ rInfo.activityInfo。
                applicationInfo.loadLabel(下午)的ToString());
    }

    最后ArrayAdapter< ResolveInfo>适配器=
        新的ArrayAdapter< ResolveInfo>(这一点,R.layout.list_item,列表)
        {
            @覆盖
            公共查看getView(INT位置,查看convertView,父母的ViewGroup)
            {
                convertView = super.getView(位置,convertView,父母);
                最后字符串文本= list.get(位置).activityInfo。
                    applicationInfo.loadLabel(PM)的ToString();
                ((TextView中)convertView).setText(文本);
                返回convertView;
            }
        };
    setListAdapter(适配器);

    ListView的LV = getListView();
    lv.setTextFilterEnabled(真正的);
}
 

此方式,您有您的自定义 ArrayAdapter 实现,这显示applicationinfo在的TextView 。<的适当标签/ P>

您也可以做到这一点,如果你创建一个新的的ArrayList&LT;字符串&GT; ,并填充它里面的循环,你登录的应用程序:

 最后的ArrayList&LT;字符串&GT; labelList =新的ArrayList&LT;字符串&GT;();
对于(ResolveInfo rInfo:名单)
{
    Log.i(TAG:安装的应用程序+ rInfo.activityInfo。
            applicationInfo.loadLabel(下午)的ToString());
    labelList.add(rInfo.activityInfo。
            applicationInfo.loadLabel(下午)的ToString());
}

最后ArrayAdapter&LT;字符串&GT;适配器=新的ArrayAdapter&LT;字符串&GT;(这一点,
        R.layout.list_item,labelList);
setListAdapter(适配器);
 

然后你使用这个新的 labelList 作为源的适配器

更新
要包含的图标到项目渲染器,重写的 getView 方法将如下所示:

  @覆盖
公共查看getView(INT位置,查看convertView,父母的ViewGroup)
{
    如果(convertView == NULL)
        convertView = LayoutInflater.from(parent.getContext())。
            膨胀(R.layout.list_item,父母,假);

    最后字符串文本= list.get(位置).activityInfo。
        applicationInfo.loadLabel(PM)的ToString();
    ((TextView中)convertView.findViewById(R.id.text))的setText(文本)。

    最终绘制对象绘制= list.get(位置).activityInfo.applicationInfo.loadIcon(PM);
    ((ImageView的)convertView.findViewById(R.id.image))setImageDrawable(绘制);

    返回convertView;
}
 

和您的 RES /布局/ list_item.xml 布局文件必须包含在 文本 的TextView 图片 的ImageView

 &LT; XML版本=1.0编码=UTF-8&GT?;
&LT; LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:方向=横向机器人:layout_width =FILL_PARENT
    机器人:layout_height =FILL_PARENT&GT;
    &LT; ImageView的机器人:ID =@ + ID /图像
        机器人:layout_width =50dp机器人:layout_height =50dp/&GT;
    &LT; TextView的机器人:ID =@ + ID /文
        机器人:layout_width =FILL_PARENT机器人:layout_height =WRAP_CONTENT
        机器人:填充=10dp机器人:TEXTSIZE =16SP/&GT;
&LT; / LinearLayout中&GT;
 

I am trying to write a very simple app that displays the name of every installed app on the device in a listview. I am using Google's ListView tutorial as a base.

Here is my code:

@Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        final PackageManager pm = this.getPackageManager();

        Intent intent = new Intent(Intent.ACTION_MAIN, null);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);

        final ArrayList<ResolveInfo> list =
                (ArrayList<ResolveInfo>) pm.queryIntentActivities(intent, 
                        PackageManager.PERMISSION_GRANTED);
        for (ResolveInfo rInfo : list)
        {
            Log.i(TAG, ": Installed Applications " + rInfo.activityInfo.
                    applicationInfo.loadLabel(pm).toString());
        }

        final ArrayAdapter<ResolveInfo> adapter = 
            new ArrayAdapter<ResolveInfo>(this, R.layout.list_item, list)
            {
            @Override
            public View getView(int position, View convertView, ViewGroup parent)
            {
                if (convertView == null)
                    convertView = LayoutInflater.from(parent.getContext()).
                        inflate(R.layout.list_item, parent, false);

                final String text = list.get(position).activityInfo.
                    applicationInfo.loadLabel(pm).toString();
                ((TextView)convertView.findViewById(R.id.text)).setText(text);

                final Drawable drawable = list.get(position).activityInfo.applicationInfo.loadIcon(pm);
                ((ImageView)convertView.findViewById(R.id.image)).setImageDrawable(drawable);

                return convertView;
            }

            };
        setListAdapter(adapter);

        ListView lv = getListView();
        lv.setTextFilterEnabled(true);
        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

                // On Item Click Activity
                // This is where I want to send the Package Name of the app selected to be passed to a method.


            }
          });
    }




 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <ImageView android:id="@+id/image" 
        android:layout_width="50dp" android:layout_height="50dp" />
    <TextView android:id="@+id/text"
        android:layout_width="fill_parent" android:layout_height="wrap_content"
        android:padding="10dp" android:textSize="16sp" />
</LinearLayout>   

UPDATE: I now need to use an OnItemClickListener to pass the Package Name of the App selected to a method.

解决方案

To display your activities' names correctly in the list, you should override the getView method of your ListAdapter, and set some of your local variables as final (to work with inner class):

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);

    final PackageManager pm = this.getPackageManager();

    Intent intent = new Intent(Intent.ACTION_MAIN, null);
    intent.addCategory(Intent.CATEGORY_LAUNCHER);

    final ArrayList<ResolveInfo> list =
            (ArrayList<ResolveInfo>) pm.queryIntentActivities(intent, 
                    PackageManager.PERMISSION_GRANTED);
    for (ResolveInfo rInfo : list)
    {
        Log.i(TAG, ": Installed Applications " + rInfo.activityInfo.
                applicationInfo.loadLabel(pm).toString());
    }

    final ArrayAdapter<ResolveInfo> adapter = 
        new ArrayAdapter<ResolveInfo>(this, R.layout.list_item, list)
        {
            @Override
            public View getView(int position, View convertView, ViewGroup parent)
            {
                convertView = super.getView(position, convertView, parent);
                final String text = list.get(position).activityInfo.
                    applicationInfo.loadLabel(pm).toString();
                ((TextView)convertView).setText(text);
                return convertView;
            }
        };
    setListAdapter(adapter);

    ListView lv = getListView();
    lv.setTextFilterEnabled(true);
}

This way you have your custom ArrayAdapter implementation, which displays the proper label of applicationinfo in the TextView.

You can also achieve this, if you create a new ArrayList<String>, and populate it inside the for cycle where you log the applications:

final ArrayList<String> labelList = new ArrayList<String>();
for (ResolveInfo rInfo : list)
{
    Log.i(TAG, ": Installed Applications " + rInfo.activityInfo.
            applicationInfo.loadLabel(pm).toString());
    labelList.add(rInfo.activityInfo.
            applicationInfo.loadLabel(pm).toString());
}

final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
        R.layout.list_item, labelList);
setListAdapter(adapter);

Then you use this new labelList as the source of your adapter.

Update
To include the icon into the item renderers, the overridden getView method would look like:

@Override
public View getView(int position, View convertView, ViewGroup parent)
{
    if (convertView == null)
        convertView = LayoutInflater.from(parent.getContext()).
            inflate(R.layout.list_item, parent, false);

    final String text = list.get(position).activityInfo.
        applicationInfo.loadLabel(pm).toString();
    ((TextView)convertView.findViewById(R.id.text)).setText(text);

    final Drawable drawable = list.get(position).activityInfo.applicationInfo.loadIcon(pm);
    ((ImageView)convertView.findViewById(R.id.image)).setImageDrawable(drawable);

    return convertView;
}

and your res/layout/list_item.xml layout file has to contain the text TextView and the image ImageView:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <ImageView android:id="@+id/image" 
        android:layout_width="50dp" android:layout_height="50dp" />
    <TextView android:id="@+id/text"
        android:layout_width="fill_parent" android:layout_height="wrap_content"
        android:padding="10dp" android:textSize="16sp" />
</LinearLayout>   

这篇关于问题显示所有已安装的应用程序一个ListView和实施OnItemClickListener的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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