Android中获取应用程序(包)的信息 PackageManager的使用

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 } } } }