demo地址

主要应用类

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";@Overrideprotected 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() {@Overridepublic void onClick(View v) {Toast.makeText(getApplication(), msg, Toast.LENGTH_SHORT).show();}});}}

具体工具类

package com.example.activitylibrary;import android.content.Context;/*** 根据资源的名字获取其ID值* @author**/
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;}
}