说明: 获得已安装的应用程序信息 。可以通过 getPackageManager()方法获得。
常用方法:
public abstract PackageManager getPackageManager()
功能:获得一个PackageManger对象
public abstrac tDrawable getApplicationIcon(StringpackageName)
参数: packageName 包名
功能:返回给定包名的图标,否则返回null
public abstract ApplicationInfo getApplicationInfo(String packageName, int flags)
参数:packagename 包名
flags 该ApplicationInfo是此flags标记,通常可以直接赋予常数0即可
功能:返回该ApplicationInfo对象
public abstract List<ApplicationInfo> getInstalledApplications(int flags)
参数:flag为一般为GET_UNINSTALLED_PACKAGES,那么此时会返回所有ApplicationInfo。我们可以对ApplicationInfo的flags过滤,得到我们需要的。
功能:返回给定条件的所有PackageInfo
public abstract List<PackageInfo> getInstalledPackages(int flags)
参数如上
功能:返回给定条件的所有PackageInfo
public abstractResolveInfo resolveActivity(Intent intent, int flags)
参数: intent 查寻条件,Activity所配置的action和category
flags: MATCH_DEFAULT_ONLY :Category必须带有CATEGORY_DEFAULT的Activity,才匹配
GET_INTENT_FILTERS :匹配Intent条件即可
GET_RESOLVED_FILTER :匹配Intent条件即可
功能 :返回给定条件的ResolveInfo对象(本质上是Activity)
public abstract List<ResolveInfo> queryIntentActivities(Intent intent, int flags)
参数同上
功能 :返回给定条件的所有ResolveInfo对象(本质上是Activity),集合对象
public abstract ResolveInfo resolveService(Intent intent, int flags)
参数同上
功能 :返回给定条件的ResolveInfo对象(本质上是Service)
public abstract List<ResolveInfo> queryIntentServices(Intent intent, int flags)
参数同上
功能 :返回给定条件的所有ResolveInfo对象(本质上是Service),集合对象
案例讲解
通过queryIntentActivities()方法,查询Android系统的所有具备ACTION_MAIN和CATEGORY_LAUNCHER的Intent的应用程序,点击后,能启动该应用,说白了就是做一个类似Home程序的简易Launcher 。
布局文件
<?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/listviewApp" 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:layout_width="fill_parent" android:layout_height="50dip"> <ImageView android:id="@+id/imgApp" android:layout_width="wrap_content" android:layout_height="fill_parent" ></ImageView> <RelativeLayout android:layout_width="fill_parent" android:layout_marginLeft="10dip" android:layout_height="40dip"> <TextView android:id="@+id/tvLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="AppLable : "></TextView> <TextView android:id="@+id/tvAppLabel" android:layout_width="wrap_content" android:layout_toRightOf="@id/tvLabel" android:layout_height="wrap_content" android:layout_marginLeft="3dip" android:text="Label" android:textColor="#FFD700"></TextView> <TextView android:id="@+id/tvName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/tvLabel" android:text="包名:"></TextView> <TextView android:id="@+id/tvPkgName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/tvAppLabel" android:layout_alignLeft="@id/tvAppLabel" android:textColor="#FFD700"></TextView> </RelativeLayout> </LinearLayout>
自定义适配器类
//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); } } }
MainActivity.java 主工程逻辑
请仔细体会queryIntentActivities()方法,并且注意到排序,它很重要。
public class MainActivity extends Activity implements OnItemClickListener { private ListView listview = null; private List<AppInfo> mlistAppInfo = null; @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); } // 点击跳转至该应用程序 public void onItemClick(AdapterView<?> arg0, View view, int position, long arg3) { // TODO Auto-generated method stub Intent intent = mlistAppInfo.get(position).getIntent(); startActivity(intent); } // 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, PackageManager.MATCH_DEFAULT_ONLY); // 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 System.out.println(appLabel + " activityName---" + activityName + " pkgName---" + pkgName); } } } }
转自: http://blog.csdn.net/qinjuning/article/details/6867806
下面部分的内容是 如何获取安装包得大小,包括缓存大小(cachesize)、数据大小(datasize)、应用程序大小(codesize)。
本部分的知识点涉及到AIDL、Java反射机制。理解起来也不是很难。
关于安装包得大小信息封装在PackageStats类中,该类很简单,只有几个字段:
PackageStats类:
常用字段:
public long cachesize 缓存大小
public long codesize 应用程序大小
public long datasize 数据大小
public String packageName 包名
PS:应用程序的总大小 = cachesize + codesize + datasize
也就是说只要获得了 安装包所对应的PackageStats对象,就可以获得信息了。但是在AndroidSDK中并没有显示提供方法来
获得该对象,是不是很苦恼呢?但是, 我们可以通过放射机制来调用系统中隐藏的函数(@hide)来获得每个安装包得信息。
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 queryPacakgeSize(mlistAppInfo.get(position).getPkgName()); 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 } } } }
转自: http://blog.csdn.net/qinjuning/article/details/6892054