预置多媒体文件等到手机的指定目录

左手的ㄟ右手 2022-08-18 05:45 169阅读 0赞

预置mp3，video，picture等文件到手机的指定目录的步骤：

一：先把要预置的文件放到系统的文件目录，通常是放在：out\\target\\product\\msm8916\_64\\data 这个目录下，在这里创建一个文件夹media。

实现代码如下：

1）在目录：LINUX\\android\\device\\qcom\\msm8909 添加一个文件夹：built\_in\_media，需要预置的多媒体文件都放在这里，然后，在这里创建一个Android.mk 文件，Android.mk的内容如下：

\# the dir of out/target/product/msm8909/data/built\_in\_media/ not recommend changes,  
\# if you nedd to change ,synchronize change the following files:packages/apps/PackageInstaller/src/.../FirstCopyReceiver.java  
这个注释的意思是说，如果你修改了out/target/product/msm8909/data/目录下 文件夹：built\_in\_media/的名字，那么在把这些预置文件从文件系统拷贝到手机的指定目录时，也要做相应修改，即是在文件：FirstCopyReceiver.java中修改，后面会介绍。  
  
PREBUILT\_MULTI\_MEDIA := device/qcom/msm8909/built\_in\_media/  
PREBUILT\_MULTI\_MEDIA\_PATH := out/target/product/msm8909/data/built\_in\_media/  
  
$(shell mkdir -p $(PREBUILT\_MULTI\_MEDIA\_PATH))  
$(shell cp -rf $(PREBUILT\_MULTI\_MEDIA)\*.mp3 $(PREBUILT\_MULTI\_MEDIA\_PATH))  
$(shell cp -rf $(PREBUILT\_MULTI\_MEDIA)\*.mp4 $(PREBUILT\_MULTI\_MEDIA\_PATH))  
$(shell cp -rf $(PREBUILT\_MULTI\_MEDIA)\*.jpg $(PREBUILT\_MULTI\_MEDIA\_PATH))

这个Android.mk 的作用，就是把预置文件放置到 这个目录：out/target/product/msm8909/data/built\_in\_media/

\+++ LINUX\\android\\device\\qcom\\msm8909\\msm8909.mk

......

\#QTIC flag  
\-include $(QCPATH)/common/config/qtic-config.mk

include device/qcom/msm8909/built\_in\_media/Android.mk //添加Anroid.mk到编译过程

......

2）因为从目录out/target/product/msm8909/data/built\_in\_media/ 复制到手机fileManager的指定目录，有权限要求，所以要在开机的流程中修改这个目录：out/target/product/msm8909/data/built\_in\_media/的读写权限。

LINUX\\android\\system\\core\\rootdir\\init.rc

......

on post-fs-data

......

chmod 0777 /data/built\_in\_media

......

3）在第一次开机挂载存储设备时发出copy预置文件的消息。

LINUX\\android\\frameworks\\base\\services\\core\\java\\com\\android\\server\\MountService.java

private void handleSystemReady() \{

if(path.equals("/storage/emulated/0"))\{  
String isFirstBoot = SystemProperties.get("persist.sys.mount\_is\_first");  
if (DEBUG\_EVENTS)\{  
Slog.i("wangjianlin", "path.equals(/mnt/sdcard) "+path.equals("/storage/emulated/0")  
\+",state.equals(Environment.MEDIA\_MOUNTED)="+state.equals(Environment.MEDIA\_MOUNTED));  
SystemProperties.set("persist.sys.mount.path\_value", path);  
\}  
  
if((isFirstBoot == null || isFirstBoot.equals("")) && state.equals(Environment.MEDIA\_MOUNTED))\{  
SystemProperties.set("persist.sys.mount\_is\_first", "DONE");  
 Intent firIntent = new Intent("android.intent.action.MEDIA\_MOUNTED\_FOR\_FIRTIME");  
 mContext.sendStickyBroadcast(firIntent);

\}  
\}

4）在这里\\code\\LINUX\\android\\packages\\apps\\PackageInstaller\\做复制文件到指定目录的工作。

先在 AndroidManifest.xml 添加权限，及消息过滤设置

<uses-permission android:name="android.permission.WRITE\_EXTERNAL\_STORAGE" />  
<uses-permission android:name="android.permission.MOUNT\_UNMOUNT\_FILESYSTEMS" />

然后，添加文件如下文件，内容很好理解，不做解释了

package com.android.packageinstaller;

import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.io.InputStream;  
  
  
import android.content.BroadcastReceiver;  
import android.content.Context;  
import android.content.Intent;  
import android.util.Log;

FirstCopyReceiver.java

\{  
private static final boolean DEBUG\_COPY = false;  
/\*\*  
\* delete file or folder  
\* @param folder Path String ,absolute path of file :/mnt/sdcard/test/1.png  
\*/  
public static void deleteDirectory(String folderPath)  
\{  
try  
\{  
// delete all files  
deleteAllFile(folderPath);  
File lastFile = new File(folderPath);  
if (lastFile.exists())  
\{  
//delete the empty folder  
lastFile.delete();  
\}  
\}  
catch (Exception e)  
\{  
e.printStackTrace();  
\}  
\}  
/\*\*  
\* delete file or folder  
\* @param folder Path String ,absolute path of file :/mnt/sdcard/test/1.png  
\*/  
private static void deleteAllFile(String path)  
\{  
//open up a file space in memory  
File file = new File(path);  
if (!file.exists())  
\{  
return;  
\}  
if (file.isFile())  
\{  
file.delete();  
\}  
else if (file.isDirectory())  
\{  
String\[\] tempList = file.list();  
File temp = null;  
for (int i = 0; i < tempList.length; i++)  
\{  
if (path.endsWith(File.separator))  
\{  
temp = new File(path + tempList\[i\]);  
\}  
else  
\{  
temp = new File(path + File.separator + tempList\[i\]);  
\}  
if (temp.isFile())  
\{  
temp.delete();  
\}  
if (temp.isDirectory())  
\{  
deleteAllFile(path + "/" + tempList\[i\]);  
deleteDirectory(path + "/" + tempList\[i\]);  
\}  
\}  
\}  
\}  
public void copyFolder(String oldPath, String newPath) \{  
 try \{  
 (new File(newPath)).mkdirs();  
 if(DEBUG\_COPY)\{  
 Log.d("FirstCopyReceiver", "---"+oldPath+":to:"+newPath);  
 \}  
 File srcDir=new File(oldPath);  
 String\[\] file=srcDir.list();  
 if(file == null)  
 \{  
 Log.d("FirstCopyReceiver", "file is NULL, error! srcDir.isDirectory()="+srcDir.isDirectory());  
return;  
 \}  
 File temp=null;  
 for (int i = 0; i < file.length; i++) \{  
 if(oldPath.endsWith(File.separator))\{  
 temp=new File(oldPath+file\[i\]);  
 \}  
 else\{  
 temp=new File(oldPath+File.separator+file\[i\]);  
 \}  
 if(DEBUG\_COPY)\{  
  Log.d("FirstCopyReceiver", "temp."+i+"="+temp);  
 \}  
  
 if(temp.isFile())\{  
 FileInputStream input = new FileInputStream(temp);  
 FileOutputStream output = new FileOutputStream(newPath + "/" + (temp.getName()).toString());  
 byte\[\] b = new byte\[1024 \* 5\];  
 int len;  
 while ( (len = input.read(b)) != -1) \{  
 output.write(b, 0, len);  
 \}  
 output.flush();  
 output.close();  
 input.close();  
 \}  
 if(temp.isDirectory())\{  
 copyFolder(oldPath+"/"+file\[i\],newPath+"/"+file\[i\]);  
 \}  
 \}  
 \}  
 catch (Exception e) \{  
  Log.d("FirstCopyReceiver", "copy failure");  
 e.printStackTrace();  
  
 \}  
  
 \}  
@Override  
public void onReceive(Context context, Intent intent) \{  
if(DEBUG\_COPY)\{  
Log.d("FirstCopyReceiver", "onReceive,intent="+intent);  
\}  
copyFolder("/data/built\_in\_media", "/storage/emulated/0/ArquivosDL"); //指定的手机filemanager目录  
if(DEBUG\_COPY)\{  
Log.d("FirstCopyReceiver", "after copy");  
\}  
deleteDirectory("/data/built\_in\_media");  
if(DEBUG\_COPY)\{  
Log.d("FirstCopyReceiver", "deleted");  
\}  
\}  
\}