Android 备份(提取)apk

本文介绍两种提取完整apk（系统预装的和用户安装的）

一、通过adb提取（适合开发者）

1. adb shell pm list packages找到要提取apk的包名

F:\winadb>adb shell pm list packages
package:com.android.fmradio
package:com.mediatek.gba
package:com.mediatek.ims
package:com.android.cts.priv.ctsshim
package:com.google.android.youtube
package:org.simalliance.openmobileapi.uicc2terminal
package:com.google.android.ext.services
package:com.android.providers.telephony
...

2. adb shell pm path 定位apk所在系统路径

F:\winadb>adb shell pm path com.google.android.youtube
package:/system/app/YouTube/YouTube.apk

3. adb pull <remote> [<local>] 从手机把apk pull下来

F:\winadb>adb pull /system/app/YouTube/YouTube.apk
9745 KB/s (31047955 bytes in 3.111s)

这样三步就把想要的apk pull下来了，但是有个问题，执行第1步时，会dump很多包名，怎么确定那个包名是自己想要提取的apk吗？有些熟悉apk对应的包名一眼就认出来，但是对一个陌生的apk，是很难确定包名的。

二、app实现提取（适合大众）

比如坐高铁（或火车），看见隔壁的小伙伴玩的某款游戏，好像挺有意思，也想玩一下，好不容易向人家问到了，App名字，但是高速奔跑的高铁上没有WIFI，4G/3G网络（2G就不考虑了）又不好，怎么下载呢？如果能离线传输岂不更好？的确有，比如蓝牙、WIFI P2P（WIFI直连）都可以传输文件。这种情况还得apk在手机存储卡，否则也无法分享了。

下面就介绍通过app的方式将app（系统预装的和用户安装的）提取到手机存储（sdcard），实现的原理就像shell命令cp，java的实现是通过文件输入/输出流进行拷贝。（思路借鉴快牙app）

先上一张图，左边是快牙app，右边是本文说的demo

demo上面三个按钮用于过滤显示系统应用和用户自己安装的应用，每个item显示应用的图标、应用的名称、应用的包名、应用所在系统路径，一一对应，很容找到想要备份的apk了，长按弹出ContextMenu即可备份，代码比较简单，就一个类，直接贴出来了

package com.android.backupapp;import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.text.Collator;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;import com.android.backupapp.R.string;import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.UserHandle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnCreateContextMenuListener;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;public class MainActivity extends Activity implementsOnCreateContextMenuListener, OnClickListener {private PackageManager mPackageManager;private Button mBtnAllApps;private Button mBtnSystemApps;private Button mBtnDataApps;private ListView mListView;private AppListAdapter mAdapter;public int MID;private static final String BACKUP_PATH = "/sdcard/Backup/";private static final String APK = ".apk";private static final String ODEX = ".odex";private static final String OAT32 = "oat/arm";private static final String OAT64 = "oat/arm64";public static enum AppType {SYSTEM, DATA, ALL}private static final int EVENT_COMPLETE = 1;private Handler mH = new Handler() {public void handleMessage(Message msg) {switch (msg.what) {case EVENT_COMPLETE:Toast.makeText(MainActivity.this, (String) msg.obj,Toast.LENGTH_SHORT).show();break;}}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mListView = (ListView) findViewById(R.id.listview);mListView.setOnCreateContextMenuListener(this);mBtnAllApps = (Button) findViewById(R.id.all_apps);mBtnSystemApps = (Button) findViewById(R.id.system_apps);mBtnDataApps = (Button) findViewById(R.id.data_apps);mBtnAllApps.setOnClickListener(this);mBtnSystemApps.setOnClickListener(this);mBtnDataApps.setOnClickListener(this);mPackageManager = getPackageManager();List<PackageInfo> lists = mPackageManager.getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);Collections.sort(lists, new DisplayNameComparator(mPackageManager));mAdapter = new AppListAdapter(this, lists);mListView.setAdapter(mAdapter);}@Overridepublic void onClick(View view) {// TODO Auto-generated method stubif (view == mBtnAllApps) {if (mAdapter.getAppType() != AppType.ALL) {mAdapter.setAppType(AppType.ALL);mAdapter.notifyDataSetChanged();}} else if (view == mBtnSystemApps) {if (mAdapter.getAppType() != AppType.SYSTEM) {mAdapter.setAppType(AppType.SYSTEM);mAdapter.notifyDataSetChanged();}} else if (view == mBtnDataApps) {if (mAdapter.getAppType() != AppType.DATA) {mAdapter.setAppType(AppType.DATA);mAdapter.notifyDataSetChanged();}}}@Overridepublic void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {// TODO Auto-generated method stubMenuInflater inflater = new MenuInflater(this);inflater.inflate(R.menu.context_menu, menu);super.onCreateContextMenu(menu, v, menuInfo);}@Overridepublic boolean onContextItemSelected(MenuItem item) {// TODO Auto-generated method stubAdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();MID = (int) info.id;PackageInfo pi = mAdapter.getItem(MID);switch (item.getItemId()) {case R.id.backup:backupApp(pi);return true;}return super.onContextItemSelected(item);}private Drawable getAppIcon(PackageInfo packageInfo) {return packageInfo.applicationInfo.loadIcon(mPackageManager);}private String getAppName(PackageInfo packageInfo) {return packageInfo.applicationInfo.loadLabel(mPackageManager).toString();}private String getAppPackageName(PackageInfo packageInfo) {return packageInfo.packageName;}private String getAppSourceDir(PackageInfo packageInfo) {return packageInfo.applicationInfo.sourceDir;}private void backupApp(PackageInfo packageInfo) {String source = getAppSourceDir(packageInfo);if ((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {String key = getAppName(packageInfo);String dest = BACKUP_PATH + key + APK;Toast.makeText(this, R.string.backup_start, Toast.LENGTH_SHORT).show();new Thread(new CopyRunnable(source, dest, key)).start();} else {String path = new File(source).getParent();String name = new File(source).getName();name = name.substring(0, name.indexOf(APK));String kitKat = new File(path).getParent() + File.separator + name+ ODEX;String oat32 = path + File.separator + OAT32 + File.separator+ name + ODEX;String oat64 = path + File.separator + OAT64 + File.separator+ name + ODEX;if (!new File(kitKat).exists() && !new File(oat32).exists()&& !new File(oat64).exists()) {String key = getAppName(packageInfo);if (getAppIcon(packageInfo).equals(getAppPackageName(packageInfo))) {key = name;}String dest = BACKUP_PATH + key + APK;Toast.makeText(this, R.string.backup_start, Toast.LENGTH_SHORT).show();new Thread(new CopyRunnable(source, dest, key)).start();} else {Toast.makeText(this, R.string.apk_has_oat, Toast.LENGTH_SHORT).show();}}}private class CopyRunnable implements Runnable {private String source;private String dest;private String key;public CopyRunnable(String source, String dest, String key) {this.source = source;this.dest = dest;this.key = key;}@Overridepublic void run() {// TODO Auto-generated method stubtry {int length = 1024 * 1024;if (!new File(BACKUP_PATH).exists()) {new File(BACKUP_PATH).mkdirs();}File fDest = new File(dest);if (fDest.exists()) {fDest.delete();}fDest.createNewFile();FileInputStream in = new FileInputStream(new File(source));FileOutputStream out = new FileOutputStream(fDest);FileChannel inC = in.getChannel();FileChannel outC = out.getChannel();int i = 0;while (true) {if (inC.position() == inC.size()) {inC.close();outC.close();Message message = mH.obtainMessage(EVENT_COMPLETE);message.obj = MainActivity.this.getString(R.string.backup_success, key, dest);mH.sendMessage(message);break;}if ((inC.size() - inC.position()) < 1024 * 1024) {length = (int) (inC.size() - inC.position());} else {length = 1024 * 1024;}inC.transferTo(inC.position(), length, outC);inC.position(inC.position() + length);i++;}} catch (Exception e) {// TODO: handle exceptionLog.e("zhouyj", e.toString());}}}private class AppListAdapter extends BaseAdapter {private Context context;private List<PackageInfo> lists;private AppType appType = AppType.DATA;public AppListAdapter(Context context, List<PackageInfo> lists) {this.context = context;this.lists = lists;}public AppType getAppType() {return appType;}public void setAppType(AppType appType) {this.appType = appType;}private List<PackageInfo> getDataList(AppType appType) {List<PackageInfo> l = new ArrayList<PackageInfo>();switch (appType) {case SYSTEM:for (PackageInfo pi : lists) {if ((pi.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {l.add(pi);}}break;case DATA:for (PackageInfo pi : lists) {if ((pi.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {l.add(pi);}}break;case ALL:return lists;}return l;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn getDataList(getAppType()).size();}@Overridepublic PackageInfo getItem(int position) {// TODO Auto-generated method stubreturn getDataList(getAppType()).get(position);}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubPackageInfo pi = getItem(position);ViewHolder viewHolder = null;if (convertView == null) {viewHolder = new ViewHolder();LayoutInflater mInflater = LayoutInflater.from(context);convertView = mInflater.inflate(R.layout.layout_item, null);viewHolder.imageView = (ImageView) convertView.findViewById(R.id.drawable);viewHolder.tvAppName = (TextView) convertView.findViewById(R.id.app_name);viewHolder.tvPackageName = (TextView) convertView.findViewById(R.id.package_name);viewHolder.tvPath = (TextView) convertView.findViewById(R.id.app_path);convertView.setTag(viewHolder);} else {viewHolder = (ViewHolder) convertView.getTag();}viewHolder.imageView.setImageDrawable(getAppIcon(pi));viewHolder.tvAppName.setText(getAppName(pi));viewHolder.tvPackageName.setText(getAppPackageName(pi));viewHolder.tvPath.setText(getAppSourceDir(pi));return convertView;}}private static class ViewHolder {ImageView imageView;TextView tvAppName;TextView tvPackageName;TextView tvPath;}public static class DisplayNameComparator implementsComparator<PackageInfo> {public DisplayNameComparator(PackageManager pm) {mPM = pm;mCollator.setStrength(Collator.PRIMARY);}public final int compare(PackageInfo a, PackageInfo b) {// We want to put the one targeted to another user at the end of the// dialog.CharSequence sa = a.applicationInfo.loadLabel(mPM);if (sa == null)sa = a.packageName;CharSequence sb = b.applicationInfo.loadLabel(mPM);if (sb == null)sb = b.packageName;return mCollator.compare(sa.toString(), sb.toString());}private final Collator mCollator = Collator.getInstance();private PackageManager mPM;}}

Demo完整下载

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