android 打包带有资源的jar包
2016-06-24 15:21
423 查看
将一些封好的接口以供第三方使用,是目前常用的一种共享方式。
既能达到功能共享,又可以保护自己的东西不被破解。那么如何将带有资源文件的工程
打包成jar哪,这个其实也不难,就是利用了java的反射机制。
举例如下:
利用反射根据资源名字获取资源ID(其实系统也自带了根据资源名字获取资源ID的方法getResources().getIdentifier("main_activity", "layout", getPackageName());第一个参数是资源的名字,第二个参数是资源的类型,例如layout, string等,第三个是包名字)
[java] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
package com.example.activitylibrary;
import android.content.Context;
/**
* 根据资源的名字获取其ID值
* @author mining
*
*/
public class MResource {
public static int getIdByName(Context context, String className, String name) {
String packageName = context.getPackageName();
Class r = null;
int id = 0;
try {
r = Class.forName(packageName + ".R");
Class[] classes = r.getClasses();
Class desireClass = null;
for (int i = 0; i < classes.length; ++i) {
if (classes[i].getName().split("\\$")[1].equals(className)) {
desireClass = classes[i];
break;
}
}
if (desireClass != null)
id = desireClass.getField(name).getInt(desireClass);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
return id;
}
}
LibraryActivity这里面比较简单,一个Button,一个TextView,一个ImageView
[java] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
package com.example.activitylibrary;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class LibraryActivity extends Activity {
String msg = "我是来自Jar中的Activity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(MResource.getIdByName(getApplication(), "layout", "activity_main"));
TextView mTextView = (TextView) findViewById(MResource.getIdByName(getApplication(), "id", "textView1"));
mTextView.setText(msg);
Button mButton = (Button) findViewById(MResource.getIdByName(getApplication(), "id", "button1"));
mButton.setText(msg);
mButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplication(), msg, Toast.LENGTH_SHORT).show();
}
});
}
}
Activity的布局
[html] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/button1" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:layout_marginTop="28dp"
android:src="@drawable/ic_launcher" />
</RelativeLayout>
2.我们将ActivityLibrary工程打成Jar包。右键工程--->Export---->Java--->JAR file---->Next如下图
![](https://oscdn.geek-share.com/Uploads/Images/Content/201604/02bdc460cb66c35af074125ca5b85592)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201604/b9eef8208049cfc7495119cfc4478329)
只勾选src目录,其他的都不勾选,如图
![](https://oscdn.geek-share.com/Uploads/Images/Content/201604/d1c56375fcc9b78da4908ca97eff1fd2)
通过上面这几步我们就将Android工程打包好了
3.我们来使用刚刚打包好的Activity,我们还需要刚刚那个工程的资源文件,因为我们刚刚只打包了src,资源文件不能打包,因此我们需要自己拿出来,我们需要吧Library.jar加入到libs里面去,然后用到的资源文件,如果layout,string之类的拷贝到对应工程的地方去
![](https://oscdn.geek-share.com/Uploads/Images/Content/201604/bade17b14a19007fd3a501fe5ee9e14d)
这个工程一个MainActivity,里面一个按钮,点击按钮跳转到Library中的Activity中,比较简单我直接把代码贴上
[java] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
package com.example.androidlibraryinvoke;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button mButton = (Button) findViewById(R.id.button1);
mButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClassName(getApplication(), "com.example.activitylibrary.LibraryActivity");
startActivity(intent);
}
[java] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
[java] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
});
}
}
我们需要在AndroidManifest.xml注册LibraryActivity,否则报Activity找不到异常,总体来说就是这样子,这样子我们将Activity打成的Jar包和资源文件一起发出去,人家就可以调用可
既能达到功能共享,又可以保护自己的东西不被破解。那么如何将带有资源文件的工程
打包成jar哪,这个其实也不难,就是利用了java的反射机制。
举例如下:
利用反射根据资源名字获取资源ID(其实系统也自带了根据资源名字获取资源ID的方法getResources().getIdentifier("main_activity", "layout", getPackageName());第一个参数是资源的名字,第二个参数是资源的类型,例如layout, string等,第三个是包名字)
[java] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
package com.example.activitylibrary;
import android.content.Context;
/**
* 根据资源的名字获取其ID值
* @author mining
*
*/
public class MResource {
public static int getIdByName(Context context, String className, String name) {
String packageName = context.getPackageName();
Class r = null;
int id = 0;
try {
r = Class.forName(packageName + ".R");
Class[] classes = r.getClasses();
Class desireClass = null;
for (int i = 0; i < classes.length; ++i) {
if (classes[i].getName().split("\\$")[1].equals(className)) {
desireClass = classes[i];
break;
}
}
if (desireClass != null)
id = desireClass.getField(name).getInt(desireClass);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
return id;
}
}
LibraryActivity这里面比较简单,一个Button,一个TextView,一个ImageView
[java] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
package com.example.activitylibrary;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class LibraryActivity extends Activity {
String msg = "我是来自Jar中的Activity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(MResource.getIdByName(getApplication(), "layout", "activity_main"));
TextView mTextView = (TextView) findViewById(MResource.getIdByName(getApplication(), "id", "textView1"));
mTextView.setText(msg);
Button mButton = (Button) findViewById(MResource.getIdByName(getApplication(), "id", "button1"));
mButton.setText(msg);
mButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplication(), msg, Toast.LENGTH_SHORT).show();
}
});
}
}
Activity的布局
[html] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/button1" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:layout_marginTop="28dp"
android:src="@drawable/ic_launcher" />
</RelativeLayout>
2.我们将ActivityLibrary工程打成Jar包。右键工程--->Export---->Java--->JAR file---->Next如下图
只勾选src目录,其他的都不勾选,如图
通过上面这几步我们就将Android工程打包好了
3.我们来使用刚刚打包好的Activity,我们还需要刚刚那个工程的资源文件,因为我们刚刚只打包了src,资源文件不能打包,因此我们需要自己拿出来,我们需要吧Library.jar加入到libs里面去,然后用到的资源文件,如果layout,string之类的拷贝到对应工程的地方去
这个工程一个MainActivity,里面一个按钮,点击按钮跳转到Library中的Activity中,比较简单我直接把代码贴上
[java] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
package com.example.androidlibraryinvoke;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button mButton = (Button) findViewById(R.id.button1);
mButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClassName(getApplication(), "com.example.activitylibrary.LibraryActivity");
startActivity(intent);
}
[java] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
[java] view
plain copy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
});
}
}
我们需要在AndroidManifest.xml注册LibraryActivity,否则报Activity找不到异常,总体来说就是这样子,这样子我们将Activity打成的Jar包和资源文件一起发出去,人家就可以调用可
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