轻量级安卓框架源码

上代码自己的Activity package com.young.android;import com.young.android.annotation.ViewInject;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 MainActivity extends YoungActivity {@ViewInject(id = R.id.tv)private TextView textView;@ViewInject(id = R.id.but)private Button button;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView.setText("yong inject");button.setText("注解but");button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubToast.makeText(getApplicationContext(), "注入", 1).show();}});}}<pre name="code" class="html">布局 代码 <LinearLayoutxmlns:android=""android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><TextViewandroid:layout_width="fill_parent"android:textSize="20sp"android:layout_height="wrap_content"android:id="@+id/tv"/><Buttonandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:id="@+id/but"/></LinearLayout>

父Activitypackage com.young.android;import java.lang.reflect.Field;import com.young.android.annotation.ViewInject;import com.young.android.exception.IllegalParameterException;import android.app.Activity;import android.view.View;public class YoungActivity extends Activity {@Overridepublic void setContentView(int layoutResID) {// TODO Auto-generated method stubsuper.setContentView(layoutResID);Class<? extends YoungActivity> clz = getClass();Field[] fs = clz.getDeclaredFields();for (Field f : fs) {ViewInject viewInject = f.getAnnotation(ViewInject.class);if (viewInject != null) {int id = viewInject.id();View v = findViewById(id);if (v == null)throw new IllegalParameterException("@ViewInject 参数不合法，你应该这样使用 例：首先在对应的布局文件中定义TextView，id为tv,然后在声明的TextView前标注 @ViewInject(id=R.id.tv)");f.setAccessible(true);try {f.set(YoungActivity.this, v);} catch (IllegalAccessException e) {// TODO Auto-generated catch block//e.printStackTrace();throw new IllegalParameterException("@ViewInject 参数不合法，你应该这样使用 例：首先在对应的布局文件中定义TextView，，id为tv,然后在声明的TextView前标注 @ViewInject(id=R.id.tv)");} catch (IllegalArgumentException e) {// TODO Auto-generated catch block//e.printStackTrace();throw new IllegalParameterException("@ViewInject 参数不合法，你应该这样使用 例：首先在对应的布局文件中定义TextView，id为tv,然后在声明的TextView前标注 @ViewInject(id=R.id.tv)");}f.setAccessible(false);}}}}

注解定义 package com.young.android.annotation;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Target(ElementType.FIELD )@Retention(RetentionPolicy.RUNTIME)public @interface ViewInject {public int id() default 0;}异常package com.young.android.exception;public class IllegalParameterException extends RuntimeException{ private static final long serialVersionUID = 839888641617782091L;public IllegalParameterException(String detailMessage) {super(detailMessage);// TODO Auto-generated constructor stub}}

怕仍是不能。于是他们比任何人都看的清楚，又比任何人都看的不确切。