背景设置的方法以及通过文件名来获取drowable文件夹中图片id的方法
例如 要设置背景的画面的xml的名称为bglist.xml,其中Layout的id为background_list_layout,
LayoutInflater mInflater = LayoutInflater.from(context);
View convertView = mInflater.inflate(R.layout.bglist, null);
LinearLayout background = convertView.findViewById(R.id.background_list_layout)
如果背景图为设置在项目中drowable文件夹下的文件的话:
background.setBackgroundResource(R.id.icon);
如果背景图片为某个路径下的图片文件的话:
String url = "/mnt/sdcard/DCIM/abcd-2.jpg"
Drawable image = Drawable.createFromPath(url);
background.setBackgroundDrawable(image);
// -------------------------------------------------------------------------------------------------------------------------
有时候我们需要通过文件名来获取在drowable文件夹下文件的相应id,作法有一下几种
参考网址:http://blog.csdn.net/shaojie519/article/details/6746716
一:通过 getIdentifier (String name, String defType, String defPackage)方法。
这里有两种实现
1.name 用package:type/entry,那么后面两个参数可以为null.
2.name只写文件名,后面两参数分别为文件类型和包路径。
二:通过反射机制:
给个demo: drawable文件夹中有一bluetooth.png图片。
package com.shao.acts;
import java.lang.reflect.Field;
import android.app.Activity;
import android.os.Bundle;
public class GetResIdActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//方式一:
int resId1 = getResources().getIdentifier("bluetooth", "drawable", "com.shao.acts");
if(R.drawable.bluetooth==resId1){
System.out.println("TRUE");
}
//方式二:
int resId2 = getResources().getIdentifier("com.shao.acts:drawable/bluetooth", null, null);
if(R.drawable.bluetooth==resId2){
System.out.println("TRUE");
}
//方式三:
int resId3 = getImage("bluetooth");
if(R.drawable.bluetooth==resId3){
System.out.println("TRUE");
}
}
public static int getImage(String pic) {
if(pic==null||pic.trim().equals("")){
return R.drawable.icon;
}
Class draw = R.drawable.class;
try {
Field field = draw.getDeclaredField(pic);
return field.getInt(pic);
} catch (SecurityException e) {
return R.drawable.icon;
} catch (NoSuchFieldException e) {
return R.drawable.icon;
} catch (IllegalArgumentException e) {
return R.drawable.icon;
} catch (IllegalAccessException e) {
return R.drawable.icon;
}
}
}
http://blog.csdn.net/kmyhy/article/details/6583804