我正在尝试制作一个应用程序.. - 在列表视图中显示当前正在运行的应用程序图标 - 单击列表视图上显示正在运行的应用程序图标进行切换的项目
但我不知道该怎么做，我已经用谷歌搜索了很多，但我发现我应该使用 ActivityManager.RunningTaskinfo 和 Packagemanager 来做这些
云你帮我做这些？我如何在 listview 中显示正在运行的应用程序图标并给 listview 单击事件（例如 OnItemClick）切换到在 listview 上单击的应用程序？
[左侧面板.java]
package kr.hybdms.sidepanel;
import java.util.ArrayList;
import java.util.List;
import kr.hybdms.sidepanel.PanelArrayAdapter;
import kr.hybdms.sidepanel.R;
import kr.hybdms.sidepanel.util.SystemUiHider;
import android.app.Activity;
import android.content.pm.PackageInfo;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;
/**
* An example full-screen activity that shows and hides the system UI (i.e.
* status bar and navigation/system bar) with user interaction.
*
* @see SystemUiHider
*/
public class LeftSidePanel extends Activity implements
OnItemClickListener {
ListView listView;
List<PanelItemDetail> rowItems;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_left_side_panel);
List<PackageInfo> packs = getPackageManager().getInstalledPackages(10);
Drawable[] images = new Drawable[packs.size()];
for(int i=0;i<packs.size();i++) {
PackageInfo p = packs.get(i);
images[i]= p.applicationInfo.loadIcon(getPackageManager());
}
rowItems = new ArrayList<PanelItemDetail>();
listView = (ListView) findViewById(R.id.panelcontents);
PanelArrayAdapter adapter = new PanelArrayAdapter(this,
R.layout.panelrow, rowItems);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Toast toast = Toast.makeText(getApplicationContext(),
"Item " + (position + 1) + ": " + rowItems.get(position),
Toast.LENGTH_SHORT);
toast.setGravity(Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
}
}
[面板阵列适配器.java]
package kr.hybdms.sidepanel;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
public class PanelArrayAdapter extends ArrayAdapter<PanelItemDetail> {
Context context;
public PanelArrayAdapter(Context context, int resourceId,
List<PanelItemDetail> items) {
super(context, resourceId, items);
this.context = context;
}
/*private view holder class*/
private class ViewHolder {
ImageView imageView;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
PanelItemDetail rowItem = getItem(position);
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.panelrow, null);
holder = new ViewHolder();
holder.imageView = (ImageView) convertView.findViewById(R.id.appicon);
convertView.setTag(holder);
} else
holder = (ViewHolder) convertView.getTag();
holder.imageView.setImageDrawable(rowItem.getImageId());
return convertView;
}
}
[PanelItemDetail.java]
package kr.hybdms.sidepanel;
import android.graphics.drawable.Drawable;
public class PanelItemDetail {
private Drawable imageId;
public PanelItemDetail(Drawable images) {
this.imageId = images;
}
public Drawable getImageId() {
return imageId;
}
public void setImageId(Drawable imageId) {
this.imageId = imageId;
}
}
[panelrow.xml]
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:id="@+id/appicon"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_margin="10dp" />
</RelativeLayout>
[activity_left_side_panel.xml]
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".LeftSidePanel" >
<ImageView android:id="@+id/transparentbackground"
android:src="@drawable/detector"
android:adjustViewBounds="true"
android:gravity="center_vertical"
android:scaleType="fitXY"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_x="0dp"
android:layout_y="0dp"
android:layout_marginLeft="100dp"/>
<ImageView
android:id="@+id/panelbackground"
android:layout_width="100dp"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:scaleType="fitXY"
android:src="@drawable/panelbg" />
<ListView
android:id="@+id/panelcontents"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignRight="@+id/panelbackground"
android:layout_centerVertical="true"
android:listSelector="@drawable/panel_item_bg"
android:divider="#000000" >
</ListView>
</RelativeLayout>