Android获取应用程序大小和缓存的实例代码

package com.qin.appsize;
import android.content.intent;
import android.graphics.drawable.drawable;
//model类 ，用来存储应用程序信息
public class appinfo {
private string applabel; //应用程序标签
private drawable appicon ; //应用程序图像
private intent intent ; //启动应用程序的intent ，一般是action为main和category为lancher的activity
private string pkgname ; //应用程序所对应的包名
private long cachesize ; //缓存大小
private long datasize ; //数据大小
private long codesieze ; //应用程序大小
public long getcachesize() {
return cachesize;
}
public void setcachesize(long cachesize) {
this.cachesize = cachesize;
}
public long getdatasize() {
return datasize;
}
public void setdatasize(long datasize) {
this.datasize = datasize;
}
public long getcodesieze() {
return codesieze;
}
public void setcodesieze(long codesieze) {
this.codesieze = codesieze;
}
public appinfo(){}
public string getapplabel() {
return applabel;
}
public void setapplabel(string appname) {
this.applabel = appname;
}
public drawable getappicon() {
return appicon;
}
public void setappicon(drawable appicon) {
this.appicon = appicon;
}
public intent getintent() {
return intent;
}
public void setintent(intent intent) {
this.intent = intent;
}
public string getpkgname(){
return pkgname ;
}
public void setpkgname(string pkgname){
this.pkgname=pkgname ;
}
}

package com.qin.appsize;
import java.util.list;
import android.content.context;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.baseadapter;
import android.widget.imageview;
import android.widget.textview;
//自定义适配器类，提供给listview的自定义view
public class browseapplicationinfoadapter extends baseadapter {
private list<appinfo> mlistappinfo = null;
layoutinflater infater = null;
public browseapplicationinfoadapter(context context, list<appinfo> apps) {
infater = (layoutinflater) context.getsystemservice(context.layout_inflater_service);
mlistappinfo = apps ;
}
@override
public int getcount() {
// todo auto-generated method stub
system.out.println("size" + mlistappinfo.size());
return mlistappinfo.size();
}
@override
public object getitem(int position) {
// todo auto-generated method stub
return mlistappinfo.get(position);
}
@override
public long getitemid(int position) {
// todo auto-generated method stub
return 0;
}
@override
public view getview(int position, view convertview, viewgroup arg2) {
system.out.println("getview at " + position);
view view = null;
viewholder holder = null;
if (convertview == null || convertview.gettag() == null) {
view = infater.inflate(r.layout.browse_app_item, null);
holder = new viewholder(view);
view.settag(holder);
} 
else{
view = convertview ;
holder = (viewholder) convertview.gettag() ;
}
appinfo appinfo = (appinfo) getitem(position);
holder.appicon.setimagedrawable(appinfo.getappicon());
holder.tvapplabel.settext(appinfo.getapplabel());
holder.tvpkgname.settext(appinfo.getpkgname());
return view;
}
class viewholder {
imageview appicon;
textview tvapplabel;
textview tvpkgname;
public viewholder(view view) {
this.appicon = (imageview) view.findviewbyid(r.id.imgapp);
this.tvapplabel = (textview) view.findviewbyid(r.id.tvapplabel);
this.tvpkgname = (textview) view.findviewbyid(r.id.tvpkgname);
}
}
}

package com.qin.appsize;
import java.lang.reflect.method;
import java.util.arraylist;
import java.util.collections;
import java.util.list;
import com.qin.appsize.appinfo;
import android.app.activity;
import android.app.alertdialog;
import android.content.componentname;
import android.content.context;
import android.content.dialoginterface;
import android.content.intent;
import android.content.pm.ipackagestatsobserver;
import android.content.pm.packagemanager;
import android.content.pm.packagestats;
import android.content.pm.resolveinfo;
import android.graphics.drawable.drawable;
import android.os.bundle;
import android.os.remoteexception;
import android.text.format.formatter;
import android.util.log;
import android.view.layoutinflater;
import android.view.view;
import android.widget.adapterview;
import android.widget.listview;
import android.widget.textview;
import android.widget.adapterview.onitemclicklistener;
public class mainactivity extends activity implements onitemclicklistener{
private static string tag = "app_size";
private listview listview = null;
private list<appinfo> mlistappinfo = null;
layoutinflater infater = null ; 
//全局变量，保存当前查询包得信息
private long cachesize ; //缓存大小
private long datasize ; //数据大小 
private long codesize ; //应用程序大小
private long totalsize ; //总大小
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.browse_app_list);
listview = (listview) findviewbyid(r.id.listviewapp);
mlistappinfo = new arraylist<appinfo>();
queryappinfo(); // 查询所有应用程序信息
browseapplicationinfoadapter browseappadapter = new browseapplicationinfoadapter(
this, mlistappinfo);
listview.setadapter(browseappadapter);
listview.setonitemclicklistener(this);
}
// 点击弹出对话框，显示该包得大小
public void onitemclick(adapterview<?> arg0, view view, int position,long arg3) {
//更新显示当前包得大小信息
try {
querypacakgesize(mlistappinfo.get(position).getpkgname());
} catch (exception e) {
// todo auto-generated catch block
e.printstacktrace();
} 
infater = (layoutinflater) mainactivity.this.getsystemservice(context.layout_inflater_service);
view dialog = infater.inflate(r.layout.dialog_app_size, null) ;
textview tvcachesize =(textview) dialog.findviewbyid(r.id.tvcachesize) ; //缓存大小
textview tvdatasize = (textview) dialog.findviewbyid(r.id.tvdatasize) ; //数据大小
textview tvcodesize = (textview) dialog.findviewbyid(r.id.tvcodesize) ; // 应用程序大小
textview tvtotalsize = (textview) dialog.findviewbyid(r.id.tvtotalsize) ; //总大小
//类型转换并赋值
tvcachesize.settext(formatefilesize(cachesize));
tvdatasize.settext(formatefilesize(datasize)) ;
tvcodesize.settext(formatefilesize(codesize)) ;
tvtotalsize.settext(formatefilesize(totalsize)) ;
//显示自定义对话框
alertdialog.builder builder =new alertdialog.builder(mainactivity.this) ;
builder.setview(dialog) ;
builder.settitle(mlistappinfo.get(position).getapplabel()+"的大小信息为：") ;
builder.setpositivebutton("确定", new dialoginterface.onclicklistener() {
@override
public void onclick(dialoginterface dialog, int which) {
// todo auto-generated method stub
dialog.cancel() ; // 取消显示对话框
}
});
builder.create().show() ;
}
public void querypacakgesize(string pkgname) throws exception{
if ( pkgname != null){
//使用放射机制得到packagemanager类的隐藏函数getpackagesizeinfo
packagemanager pm = getpackagemanager(); //得到pm对象
try {
//通过反射机制获得该隐藏函数
method getpackagesizeinfo = pm.getclass().getdeclaredmethod("getpackagesizeinfo", string.class,ipackagestatsobserver.class);
//调用该函数，并且给其分配参数 ，待调用流程完成后会回调pkgsizeobserver类的函数
getpackagesizeinfo.invoke(pm, pkgname,new pkgsizeobserver());
} 
catch(exception ex){
log.e(tag, "nosuchmethodexception") ;
ex.printstacktrace() ;
throw ex ; // 抛出异常
} 
}
}
//aidl文件形成的bindler机制服务类
public class pkgsizeobserver extends ipackagestatsobserver.stub{
/*** 回调函数，
* @param pstatus ,返回数据封装在packagestats对象中
* @param succeeded 代表回调成功
*/ 
@override
public void ongetstatscompleted(packagestats pstats, boolean succeeded)
throws remoteexception {
// todo auto-generated method stub
cachesize = pstats.cachesize ; //缓存大小
datasize = pstats.datasize ; //数据大小 
codesize = pstats.codesize ; //应用程序大小
totalsize = cachesize + datasize + codesize ;
log.i(tag, "cachesize--->"+cachesize+" datasize---->"+datasize+ " codesize---->"+codesize) ;
}
}
//系统函数，字符串转换 long -string (kb)
private string formatefilesize(long size){
return formatter.formatfilesize(mainactivity.this, size); 
}
// 获得所有启动activity的信息，类似于launch界面
public void queryappinfo() {
packagemanager pm = this.getpackagemanager(); // 获得packagemanager对象
intent mainintent = new intent(intent.action_main, null);
mainintent.addcategory(intent.category_launcher);
// 通过查询，获得所有resolveinfo对象.
list<resolveinfo> resolveinfos = pm.queryintentactivities(mainintent, 0);
// 调用系统排序 ， 根据name排序
// 该排序很重要，否则只能显示系统应用，而不能列出第三方应用程序
collections.sort(resolveinfos,new resolveinfo.displaynamecomparator(pm));
if (mlistappinfo != null) {
mlistappinfo.clear();
for (resolveinfo reinfo : resolveinfos) {
string activityname = reinfo.activityinfo.name; // 获得该应用程序的启动activity的name
string pkgname = reinfo.activityinfo.packagename; // 获得应用程序的包名
string applabel = (string) reinfo.loadlabel(pm); // 获得应用程序的label
drawable icon = reinfo.loadicon(pm); // 获得应用程序图标
// 为应用程序的启动activity 准备intent
intent launchintent = new intent();
launchintent.setcomponent(new componentname(pkgname,activityname));
// 创建一个appinfo对象，并赋值
appinfo appinfo = new appinfo();
appinfo.setapplabel(applabel);
appinfo.setpkgname(pkgname);
appinfo.setappicon(icon);
appinfo.setintent(launchintent);
mlistappinfo.add(appinfo); // 添加至列表中
}
}
}
}