轻量级安卓框架源码

标签：安卓   框架   反射   注解   

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;

	@Override
	protected 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() {

			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				Toast.makeText(getApplicationContext(), "注入", 1).show();
			}
		});
	}

}

<pre name="code" class="html">布局 代码 

<LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    
    <TextView 
        android:layout_width="fill_parent"
        android:textSize="20sp"
        android:layout_height="wrap_content"
        android:id="@+id/tv"/>
 
    
    <Button 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/but"/>
 
    

</LinearLayout>

父Activity
package 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 {

	@Override
	public void setContentView(int layoutResID) {
		// TODO Auto-generated method stub
		super.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
	}

 

}

轻量级安卓框架源码

标签：安卓   框架   反射   注解   

原文地址：http://blog.csdn.net/qingchunweiliang/article/details/43966795