Esempio di codice per ottenere la dimensione e la cache dell'applicazione Android

info

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 ;
}
}

Classe personalizzata

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);
}
}
}

主类

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，保存当前查询包的信息
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，显示该包的大小
public void onItemClick(AdapterView<?> arg0, View view, int position,long arg3) {
//更新显示当前包的大小信息
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) ; // Dimensione della cache
TextView tvdatasize = (TextView) dialog.findViewById(R.id.tvdatasize) ; // Dimensione dei dati
TextView tvcodesize = (TextView) dialog.findViewById(R.id.tvcodesize) ; // Dimensione dell'applicazione
TextView tvtotalsize = (TextView) dialog.findViewById(R.id.tvtotalsize) ; // Dimensione totale
// Conversione di tipo e assegnazione
tvcachesize.setText(formateFileSize(cachesize));
tvdatasize.setText(formateFileSize(datasize)) ;
tvcodesize.setText(formateFileSize(codesize)) ;
tvtotalsize.setText(formateFileSize(totalsize)) ;
// Visualizza il dialogo personalizzato
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this) ;
builder.setView(dialog) ;
builder.setTitle(mlistAppInfo.get(position).getAppLabel()+" dimensione dell'applicazione: ") ;
builder.setPositiveButton("Conferma", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.cancel() ; // Annulla la visualizzazione del dialogo
}
});
builder.create().show() ;
}
public void queryPacakgeSize(String pkgName) throws Exception{}}
if ( pkgName != null){
//Ottieni la funzione nascosta getPackageSizeInfo della classe PackageManager utilizzando il meccanismo di reflection
PackageManager pm = getPackageManager(); //Ottieni l'oggetto pm
try {
//Ottieni la funzione nascosta utilizzando il meccanismo di reflection
Method getPackageSizeInfo = pm.getClass().getDeclaredMethod("getPackageSizeInfo", String.class, IPackageStatsObserver.class);
//Chiamare questa funzione e assegnare i parametri, dopo che il flusso di chiamata è completato verrà chiamata la funzione della classe PkgSizeObserver
getPackageSizeInfo.invoke(pm, pkgName, new PkgSizeObserver());
} 
catch(Exception ex){
Log.e(TAG, "NoSuchMethodException") ;
ex.printStackTrace() ;
throw ex ; // Lanciare l'eccezione
} 
}
}
//Classe di servizio del meccanismo Binder formata dal file aidl
public class PkgSizeObserver extends IPackageStatsObserver.Stub{
/*** Funzione di callback,
* @param pStatus, i dati di ritorno sono encapsulati nell'oggetto PackageStats
* @param succeeded rappresenta il successo della callback
*/ 
@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) ;
}
}
// Funzione di sistema, conversione di stringa long - String (kb)
private String formateFileSize(long size){
return Formatter.formatFileSize(MainActivity.this, size); 
}
// Ottenere tutte le informazioni sull'Activity di avvio, simile all'interfaccia Launch
public void queryAppInfo() {
PackageManager pm = this.getPackageManager(); // Ottenere l'oggetto PackageManager
Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
// Attraverso la query, ottenere tutti gli oggetti ResolveInfo.
List<ResolveInfo> resolveInfos = pm.queryIntentActivities(mainIntent, 0);
// Chiamata all'ordinamento del sistema, ordinamento in base al nome
// L'ordinamento è molto importante, altrimenti è possibile visualizzare solo le applicazioni di sistema e non elencare le applicazioni di terze parti
Collections.sort(resolveInfos, new ResolveInfo.DisplayNameComparator(pm));
if (mlistAppInfo != null) {
mlistAppInfo.clear();
for (ResolveInfo reInfo : resolveInfos) {
String activityName = reInfo.activityInfo.name; // Ottenere il nome dell'Activity di avvio dell'applicazione
String pkgName = reInfo.activityInfo.packageName; // Ottenere il nome del pacchetto dell'applicazione
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
}
}
}
}

以上所述是小编给大家介绍的Android获取应用程序大小和缓存的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对呐喊教程网站的支持！

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