Android杂谈--获取系统及应用程序(PackageManager)

PackageManager是个非常好的东西，其他的详细的细节等日后有时间整理

PackageManager的功能：

•安装，卸载应用

•查询permission相关信息

•查询Application相关信息(application，activity，receiver，service，provider及相应属性等）

•查询已安装应用

•增加，删除permission

•清除用户数据、缓存，代码段等

我们可以用PackageManager来显示系统安装的应用程序列表或者系统程序列表

废话先不多说

AppShowActivity.java

Java代码






package com.loulijun.appshow;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

public class AppShowActivity extends Activity {
ListView lv;
MyAdapter adapter;
ArrayList<HashMap<String, Object>> items = new ArrayList<HashMap<String, Object>>();

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

lv = (ListView)findViewById(R.id.lv);
//得到PackageManager对象
PackageManager pm = getPackageManager();
//得到系统安装的所有程序包的PackageInfo对象

//List<ApplicationInfo> packs = pm.getInstalledApplications(0);

List<PackageInfo> packs = pm.getInstalledPackages(0);

for(PackageInfo pi:packs)
{
HashMap<String, Object> map = new HashMap<String, Object>();
//显示用户安装的应用程序，而不显示系统程序

// if((pi.applicationInfo.flags&ApplicationInfo.FLAG_SYSTEM)==0&&

// (pi.applicationInfo.flags&ApplicationInfo.FLAG_UPDATED_SYSTEM_APP)==0)

// {
// //这将会显示所有安装的应用程序，包括系统应用程序

// map.put("icon", pi.applicationInfo.loadIcon(pm));//图标

// map.put("appName", pi.applicationInfo.loadLabel(pm));//应用程序名称

// map.put("packageName", pi.applicationInfo.packageName);//应用程序包名

// //循环读取并存到HashMap中，再增加到ArrayList上，一个HashMap就是一项

// items.add(map);
// }
//这将会显示所有安装的应用程序，包括系统应用程序

map.put("icon", pi.applicationInfo.loadIcon(pm));//图标

map.put("appName", pi.applicationInfo.loadLabel(pm));//应用程序名称

map.put("packageName", pi.applicationInfo.packageName);//应用程序包名

//循环读取并存到HashMap中，再增加到ArrayList上，一个HashMap就是一项

items.add(map);
}
/**
* 参数：Context
* ArrayList(item的集合)
* item的layout
* 包含ArrayList中的HashMap的key的数组
* key所对应的值的相应的控件id
*/
adapter = new MyAdapter(this, items, R.layout.piitem,
new String[]{"icon", "appName", "packageName"},
new int[]{R.id.icon, R.id.appName, R.id.packageName});
lv.setAdapter(adapter);
}
}

class MyAdapter extends SimpleAdapter
{
private int[] appTo;
private String[] appFrom;
private ViewBinder appViewBinder;
private List<? extends Map<String, ?>> appData;
private int appResource;
private LayoutInflater appInflater;

public MyAdapter(Context context, List<? extends Map<String, ?>> data,
int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
appData = data;
appResource = resource;
appFrom = from;
appTo = to;
appInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

public View getView(int position, View convertView, ViewGroup parent)
{
return createViewFromResource(position, convertView, parent, appResource);

}

private View createViewFromResource(int position, View convertView, ViewGroup parent, int resource)
{
View v;
if(convertView == null)
{
v = appInflater.inflate(resource, parent,false);
final int[] to = appTo;
final int count = to.length;
final View[] holder = new View[count];

for(int i = 0; i < count; i++)
{
holder[i] = v.findViewById(to[i]);
}
v.setTag(holder);
}else
{
v = convertView;
}
bindView(position, v);
return v;
}

private void bindView(int position, View view)
{
final Map dataSet = appData.get(position);
if(dataSet == null)
{
return;
}

final ViewBinder binder = appViewBinder;
final View[] holder = (View[])view.getTag();
final String[] from = appFrom;
final int[] to = appTo;
final int count = to.length;

for(int i = 0; i < count; i++)
{
final View v = holder[i];
if(v != null)
{
final Object data = dataSet.get(from[i]);
String text = data == null ? "":data.toString();
if(text == null)
{
text = "";
}

boolean bound = false;
if(binder != null)
{
bound = binder.setViewValue(v, data, text);
}

if(!bound)
{
/**
* 自定义适配器，关在在这里，根据传递过来的控件以及值的数据类型，

* 执行相应的方法，可以根据自己需要自行添加if语句。另外，CheckBox等

* 集成自TextView的控件也会被识别成TextView，这就需要判断值的类型

*/
if(v instanceof TextView)
{
//如果是TextView控件，则调用SimpleAdapter自带的方法，设置文本

setViewText((TextView)v, text);
}else if(v instanceof ImageView)
{
//如果是ImageView控件，调用自己写的方法，设置图片

setViewImage((ImageView)v, (Drawable)data);
}else
{
throw new IllegalStateException(v.getClass().getName() + " is not a " +
"view that can be bounds by this SimpleAdapter");
}
}
}
}
}
public void setViewImage(ImageView v, Drawable value)
{
v.setImageDrawable(value);
}
}

package com.loulijun.appshow;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

public class AppShowActivity extends Activity {
ListView lv;
MyAdapter adapter;
ArrayList<HashMap<String, Object>> items = new ArrayList<HashMap<String, Object>>();

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

lv = (ListView)findViewById(R.id.lv);
//得到PackageManager对象
PackageManager pm = getPackageManager();
//得到系统安装的所有程序包的PackageInfo对象
//List<ApplicationInfo> packs = pm.getInstalledApplications(0);
List<PackageInfo> packs = pm.getInstalledPackages(0);

for(PackageInfo pi:packs)
{
HashMap<String, Object> map = new HashMap<String, Object>();
//显示用户安装的应用程序，而不显示系统程序
//        	if((pi.applicationInfo.flags&ApplicationInfo.FLAG_SYSTEM)==0&&
//        			(pi.applicationInfo.flags&ApplicationInfo.FLAG_UPDATED_SYSTEM_APP)==0)
//        	{
//        		//这将会显示所有安装的应用程序，包括系统应用程序
//            	map.put("icon", pi.applicationInfo.loadIcon(pm));//图标
//            	map.put("appName", pi.applicationInfo.loadLabel(pm));//应用程序名称
//            	map.put("packageName", pi.applicationInfo.packageName);//应用程序包名
//            	//循环读取并存到HashMap中，再增加到ArrayList上，一个HashMap就是一项
//            	items.add(map);
//        	}
//这将会显示所有安装的应用程序，包括系统应用程序
map.put("icon", pi.applicationInfo.loadIcon(pm));//图标
map.put("appName", pi.applicationInfo.loadLabel(pm));//应用程序名称
map.put("packageName", pi.applicationInfo.packageName);//应用程序包名
//循环读取并存到HashMap中，再增加到ArrayList上，一个HashMap就是一项
items.add(map);
}
/**
* 参数：Context
* ArrayList(item的集合)
* item的layout
* 包含ArrayList中的HashMap的key的数组
* key所对应的值的相应的控件id
*/
adapter = new MyAdapter(this, items, R.layout.piitem,
new String[]{"icon", "appName", "packageName"},
new int[]{R.id.icon, R.id.appName, R.id.packageName});
lv.setAdapter(adapter);
}
}

class MyAdapter extends SimpleAdapter
{
private int[] appTo;
private String[] appFrom;
private ViewBinder appViewBinder;
private List<? extends Map<String, ?>>  appData;
private int appResource;
private LayoutInflater appInflater;

public MyAdapter(Context context, List<? extends Map<String, ?>> data,
int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
appData = data;
appResource = resource;
appFrom = from;
appTo = to;
appInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

public View getView(int position, View convertView, ViewGroup parent)
{
return createViewFromResource(position, convertView, parent, appResource);

}

private View createViewFromResource(int position, View convertView, ViewGroup parent, int resource)
{
View v;
if(convertView == null)
{
v = appInflater.inflate(resource, parent,false);
final int[] to = appTo;
final int count = to.length;
final View[] holder = new View[count];

for(int i = 0; i < count; i++)
{
holder[i] = v.findViewById(to[i]);
}
v.setTag(holder);
}else
{
v = convertView;
}
bindView(position, v);
return v;
}

private void bindView(int position, View view)
{
final Map dataSet = appData.get(position);
if(dataSet == null)
{
return;
}

final ViewBinder binder = appViewBinder;
final View[] holder = (View[])view.getTag();
final String[] from = appFrom;
final int[] to = appTo;
final int count = to.length;

for(int i = 0; i < count; i++)
{
final View v = holder[i];
if(v != null)
{
final Object data = dataSet.get(from[i]);
String text = data == null ? "":data.toString();
if(text == null)
{
text = "";
}

boolean bound = false;
if(binder != null)
{
bound = binder.setViewValue(v, data, text);
}

if(!bound)
{
/**
* 自定义适配器，关在在这里，根据传递过来的控件以及值的数据类型，
* 执行相应的方法，可以根据自己需要自行添加if语句。另外，CheckBox等
* 集成自TextView的控件也会被识别成TextView，这就需要判断值的类型
*/
if(v instanceof TextView)
{
//如果是TextView控件，则调用SimpleAdapter自带的方法，设置文本
setViewText((TextView)v, text);
}else if(v instanceof ImageView)
{
//如果是ImageView控件，调用自己写的方法，设置图片
setViewImage((ImageView)v, (Drawable)data);
}else
{
throw new IllegalStateException(v.getClass().getName() + " is not a " +
"view that can be bounds by this SimpleAdapter");
}
}
}
}
}
public void setViewImage(ImageView v, Drawable value)
{
v.setImageDrawable(value);
}
}

main.xml

Java代码






<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ListView android:id="@+id/lv" android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ListView>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ListView android:id="@+id/lv" android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ListView>
</LinearLayout>

piitem.xml

Java代码






<?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/icon" android:layout_width="48dip"
android:layout_height="48dip" />
<LinearLayout android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="wrap_content">
<TextView android:id="@+id/appName" android:layout_width="fill_parent" android:layout_height="wrap_content"/>
<TextView android:id="@+id/packageName" android:layout_width="fill_parent" android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>

<?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/icon" android:layout_width="48dip"
android:layout_height="48dip" />
<LinearLayout android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="wrap_content">
<TextView android:id="@+id/appName" android:layout_width="fill_parent" android:layout_height="wrap_content"/>
<TextView android:id="@+id/packageName" android:layout_width="fill_parent" android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>

现在看看效果图

如果要只是显示用户安装的应用程序的话，可以直接使用



如果用户要显示包括系统程序的话，需要取出if的判断部分，上面代码里面有标识