Android - 如何从资源中显示图像？

Question

我无法显示保存在res/drawable文件夹中的图像.我使用ImageGetter来做到这一点.代码如下:

ImageGetter imageGetter3 = new ImageGetter() {                
    public Drawable getDrawable(String source) { 
        int id=0; 
        if (source.equals("smiley")) { 
            id = R.drawable.smiley; 
        } 
        Drawable d = getResources().getDrawable(id); 
        d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight()); 
        return d; 
    } 
};

directions += "Je bent bij lokaal " + vertrek.getNaam() + "\n" 
           + "Sta met je rug voor de deur\n" 
           + Html.fromHtml("<img src=\"smiley\">", imageGetter3, null) + " Draai naar links\n";

我在跑步时在屏幕上看到的是一个带有"obj"文字的小方块.那有什么不对？无法读取图像或其他内容？如何显示图片？

老实说,我用Google搜索了很多,并试图ImageGetter的其他方法为好,但他们都不似乎工作,我想这太,他们不工作:

ImageGetter imageGetter2 = new ImageGetter() { 
 public Drawable getDrawable(String source) { 
      Drawable d = null; 
      d = Drawable.createFromPath(source); 
      d.setBounds(0,0, d.getIntrinsicWidth(), d.getIntrinsicHeight()); 
      return d; 
 } 
};

ImageGetter imageGetter = new ImageGetter() {                
 public Drawable getDrawable(String source) { 
     Drawable drawFromPath; 
     int path = Route.this.getResources().getIdentifier(source, "drawable","com.prj56.tracingapp"); 
     drawFromPath = (Drawable) Route.this.getResources().getDrawable(path); 
     drawFromPath.setBounds(0, 0, drawFromPath.getIntrinsicWidth(), drawFromPath.getIntrinsicHeight()); 
     return drawFromPath; 
 } 
};  

================================================== ======= if(....){ImageView iv1 = new ImageView(this); iv1.setImageResource(R.drawable.smiley);

    directions += "Je bent bij lokaal " + vertrek.getNaam() + "\n" 
       + "Sta met je rug voor de deur\n";
       HERE COMES THE IMAGE! BUT HOW TO DO THIS? It's within directions textview...
    directions += " Draai naar links\n";

}

Answer 1

2016年12月12日更新:

getResources().getDrawable()在api 22中已弃用,因此您现在应该使用ContextCompat.getDrawable,例如

Drawable d = ContextCompat.getDrawable(context, R.drawable.smiley);

在您的活动中,您可以调用此方法将Drawable资源作为Drawable对象

Drawable d = getResources().getDrawable(R.drawable.smiley);

如果要在ImageView中显示可绘制的内容,可以执行以下操作:

ImageView i = new ImageView(this);
i.setImageResource(R.drawable.smiley);

或者在你的xml文件中

<ImageView   
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:src="@drawable/smiley"/>

Answer 2

您可以在pImg的帮助下获取图像.基于适配器位置获取作为图像名称的字符串.图像应存在于drawable文件夹中.

ImageView prodImg=(ImageView)view.findViewById(R.id.img_proj_name);
    String pImg=prod.get(position);
    int resID = view.getResources().getIdentifier("@drawable/"+pImg , "drawable", parentView.getContext().getPackageName());
    prodImg.setImageResource(resID);