android 修改apk的asset目录后怎么安装

Posted 2023-05-17

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　　从整体上看，一般的对于assets 里面的apk进行安装的操作是先将 apk 复制到sd上或者其他的可读取存储位置。比如我拿到的机子有两个路径

　　/mnt/emmc/ 手机的内部存储位置(其他的手机不一定有)

　　/mnt/sdcard/ 手机的sd存储位置

　　复制到这两个路径都OK。

　　首先要获取assets目录下文件的数据流，用于写到存储位置上。

　　//这里的fileName 这个是assets文件下的全文件名包括后缀名。

　　path 是存储的路径位置，绝对路径。

　　InputStream is = context.getAssets().open(fileName);

　　File file = new File(path);

　　file.createNewFile();

　　FileOutputStream fos = new FileOutputStream(file);

　　byte[] temp = new byte[1024];

　　int i = 0;

　　while ((i = is.read(temp)) > 0)

　　fos.write(temp, 0, i);

　　fos.close();

　　is.close();

　　通过Context 获取到AssetManager

参考技术A

在自己的app中安装assets目录下的apk文件的方法：

详细过程如下：

public class MainActivity extends Activity

Context mContext;

@Override

protected void onCreate(Bundle savedInstanceState)

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mContext = this;

//Toast.makeText(this, ""+Environment.getExternalStorageDirectory().getAbsolutePath(), 0).show();

if(copyApkFromAssets(this, "test.apk", Environment.getExternalStorageDirectory().getAbsolutePath()+"/test.apk"))

Builder m = new AlertDialog.Builder(mContext)

.setIcon(R.drawable.ic_launcher).setMessage("是否安装？")

.setIcon(R.drawable.ic_launcher)

.setPositiveButton("yes", new OnClickListener()

@Override

public void onClick(DialogInterface dialog, int which)

Intent intent = new Intent(Intent.ACTION_VIEW);

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

intent.setDataAndType(Uri.parse("file://" + Environment.getExternalStorageDirectory().getAbsolutePath()+"/test.apk"),

"application/vnd.android.package-archive");

mContext.startActivity(intent);

);

m.show();

public boolean copyApkFromAssets(Context context, String fileName, String path)

boolean copyIsFinish = false;

try

InputStream is = context.getAssets().open(fileName);

File file = new File(path);

file.createNewFile();

FileOutputStream fos = new FileOutputStream(file);

byte[] temp = new byte[1024];

int i = 0;

while ((i = is.read(temp)) > 0)

fos.write(temp, 0, i);

fos.close();

is.close();

copyIsFinish = true;

catch (IOException e)

e.printStackTrace();

return copyIsFinish;

Android读写properties配置文件

写这篇文章之前可以成功运行,文章后就各种找不到文件.所以并没有采用此种方式,后期完善.详见下篇解决方案.

配置文件读取很容易,修改需要注意权限,比如assets目录下就不允许修改.

配置文件的创建:

New --- File

命名后选择properties方式打开

配置文件设置

contrastIP = 192.166.1.65:8011

assets目录创建

在main目录下,与java res 目录同级创建.

New --- Folder --- Assets Folder

assets目录详解: http://blog.csdn.net/chuntiandejiaobu10/article/details/52352128

权限配置

在 AndroidManifest.xml 中添加:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

其实我去掉后测试也可以成功运行.还是加上.预防万一.

先读配置:

方法一读取assets目录下的配置

Properties props = new Properties();
props.load(context.getAssets().open(configName));

将configName文件从assets目录下放出来,放在main目录下:

方法二会出现错误 open failed: ENOENT (No such file or directory) 然而并不知道目录路径该如何填

Properties props = new Properties();
props.load(new FileInputStream(configName));

方法三这样就能成功运行

Properties props = new Properties();
props.load(context.openFileInput(configName));

修改配置:

Properties props = new Properties();
props.load(context.openFileInput(configPath));
props.setProperty(keyName, keyValue);

// 读取assets目录下的,但是根本无法修改
// FileOutputStream out = context.getAssets().openFd(configPath).createOutputStream();

// 提示 open failed: EROFS (Read-only file system) 
// FileOutputStream out = new FileOutputStream(configPath);

// 这样就可以了
FileOutputStream out = context.openFileOutput(configPath,Context.MODE_PRIVATE);

参考Context.MODE_PRIVATE说明: http://www.cnblogs.com/yjpjy/p/5407251.html

完整代码

类

ProperTies 类

package com.lemon.demo.utils;
import android.content.Context;

import android.util.Log;
import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.util.Properties;
public class ProperTies {

//private static String configPath = getExternalStorageDirectory() + File.separator + "appConfig";

private static String configPath = "appConfig";
</span><span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span><span style="color: #000000"> Properties getProperties(Context context) {
    Log.e(</span>"configPath"<span style="color: #000000">, configPath);

    Properties urlProps;
    Properties props </span>= <span style="color: #0000ff">new</span><span style="color: #000000"> Properties();
    </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
        </span><span style="color: #008000">//</span><span style="color: #008000">方法一：通过activity中的context攻取setting.properties的FileInputStream
        </span><span style="color: #008000">//</span><span style="color: #008000">注意这地方的参数appConfig在eclipse中应该是appConfig.properties才对,但在studio中不用写后缀
        </span><span style="color: #008000">//</span><span style="color: #008000">InputStream in = c.getAssets().open("appConfig.properties");

        </span><span style="color: #008000">//</span><span style="color: #008000">props.load(context.getAssets().open(configName));

        </span><span style="color: #008000">//</span><span style="color: #008000">方法二：通过class获取setting.properties的FileInputStream
        </span><span style="color: #008000">//</span><span style="color: #008000">InputStream in = PropertiesUtill.class.getResourceAsStream("/assets/  setting.properties "));

        </span><span style="color: #008000">//</span><span style="color: #008000"> 方法三</span>

            props.load(context.openFileInput(configPath));

// props.load(new FileInputStream(configPath));



} catch (Exception e1) {

// TODO Auto-generated catch block

            e1.printStackTrace();

}
    urlProps </span>=<span style="color: #000000"> props;
    </span><span style="color: #0000ff">return</span><span style="color: #000000"> urlProps;
}

</span><span style="color: #008000">//</span><span style="color: #008000">保存配置文件</span>
<span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span><span style="color: #000000"> String setProperties(Context context, String keyName, String keyValue) {
    Properties props </span>= <span style="color: #0000ff">new</span><span style="color: #000000"> Properties();
    </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
        props.load(context.openFileInput(configPath));
        props.setProperty(keyName, keyValue);
        </span><span style="color: #008000">//</span><span style="color: #008000"> FileOutputStream out = context.getAssets().openFd(configPath).createOutputStream();</span>
        FileOutputStream out =<span style="color: #000000"> context.openFileOutput(configPath,Context.MODE_PRIVATE);
        </span><span style="color: #008000">//</span><span style="color: #008000"> FileOutputStream out = new FileOutputStream(configPath);</span>
        props.store(out, <span style="color: #0000ff">null</span><span style="color: #000000">);

    } </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (Exception e) {
        e.printStackTrace();
        Log.e(</span>"setPropertiesError"<span style="color: #000000">, e.toString());
        </span><span style="color: #0000ff">return</span> "修改配置文件失败!"<span style="color: #000000">;
    }
    </span><span style="color: #0000ff">return</span> "设置成功"<span style="color: #000000">;
}

}

UrlString类:

package com.lemon.demo.json;
import android.content.Context;

import com.lemon.demo.utils.ProperTies;
import java.util.Properties;
/**

读写配置属性类

*/

public class UrlString {
<span style="color: #0000ff">private</span> String contrastIPName = "contrastIP"<span style="color: #000000">;

</span><span style="color: #008000">//</span><span style="color: #008000"> 上传路径</span>
<span style="color: #0000ff">private</span><span style="color: #000000"> String ip;
</span><span style="color: #0000ff">private</span><span style="color: #000000"> String ipAddress;

</span><span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setIPAddress(Context context) {
    Properties proper </span>=<span style="color: #000000"> ProperTies.getProperties(context);
    </span><span style="color: #0000ff">this</span>.ip = proper.getProperty(contrastIPName, ""<span style="color: #000000">);
    </span><span style="color: #0000ff">this</span>.ipAddress = "http://" + <span style="color: #0000ff">this</span>.ip + "/index.html"<span style="color: #000000">;
}

</span><span style="color: #0000ff">public</span><span style="color: #000000"> String setIPAddress(Context context, String keyValue) {
    String result </span>=<span style="color: #000000"> ProperTies.setProperties(context, contrastIPName, keyValue);
    </span><span style="color: #0000ff">this</span>.ip =<span style="color: #000000"> keyValue;
    </span><span style="color: #0000ff">this</span>.ipAddress = "http://" + <span style="color: #0000ff">this</span>.ip + "/index.html"<span style="color: #000000">;
    </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;
}

</span><span style="color: #0000ff">public</span><span style="color: #000000"> String getIP() {
    </span><span style="color: #0000ff">return</span> <span style="color: #0000ff">this</span><span style="color: #000000">.ip;
}

</span><span style="color: #0000ff">public</span><span style="color: #000000"> String getIPAddress() {
    </span><span style="color: #0000ff">return</span> <span style="color: #0000ff">this</span><span style="color: #000000">.ipAddress;
}

}

在activity中使用:

加载配置文件:

private UrlString urlString = new UrlString();
editText = (EditText) findViewById(R.id.et_ip);

// 加载配置的信息 --- IP地址

urlString.setIPAddress(this);

editText.setText(urlString.getIP());

// 获取完整地址
// urlString.getIPAddress()

修改配置文件:

String value = editText.getText().toString();
String result = urlString.setIPAddress(this,value);
tools.customToast(result, ConfigActivity.this);

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