如何从可绘制文件夹动态获取图像

Question

我有一个这样的数组。

int image[] = {R.drawable.d002_p001,R.drawable.d002_p002,R.drawable.d002_p003, 
        R.drawable.d002_p004,R.drawable.d002_p005,R.drawable.d002_p006}; 

现在我有6张图片，所以我静态地给出了名字。

如果我有50个图像，我不能给每个文件名的数组，所以它需要是动态的我怎么能做到这一点。

Answer 1

您可以使用getIdentifier()

for (int j = 1; j < 6; j++) { 
    Drawable drawable = getResources().getDrawable(getResources() 
        .getIdentifier("d002_p00"+j, "drawable", getPackageName())); 
} 

Answer 2

使用这个代码来创建数组，并在以后使用该数组

int image[] = new int[50]; 
for (int i = 1 ; i <= 50 ; i++) 
{ 
images[i] = "R.drawable.d002_p00"+i; 
} 

你要照顾主要的是文件名必须以“d002_p00”启动此之后有数字1到50

Answer 3

使用以下命令行进行动态获取绘制：

Drawable drawable = this.getResources().getDrawable(R.drawable.yourDrawableID); 

这会给你想要的绘制对象。

Answer 4

像这样的东西可以工作

Field[] drawables = android.R.drawable.class.getFields(); 
for (Field f : drawables) { 
    try { 
     System.out.println("R.drawable." + f.getName()); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

Answer 5

您也可以使用此：

int res = getResources().getIdentifier("<your pakecgename>:drawable/abc", null, null); 

Answer 6

public static Drawable getImage(Context context, String name) { 
     return context.getResources().getDrawable(context.getResources().getIdentifier(name, "drawable", context.getPackageName())); 
} 

Answer 7

String[] names = new String []{"yout names..."}; 
    for(String n: names) { 
     Utils.GetDrawableByName(n,this); 
    } 

public class Utils { 
public static Drawable GetDrawableByName(String name,Activity context){ 
    Resources res = context.getResources(); 
    return res.getDrawable(res.getIdentifier(name,"drawable",context.getPackageName())); 
    } 
} 

Answer 8

我们可以利用Imageview的setImageResource，因为这会比drawable更高效，请参考下面的代码。

下面的代码可以用来显示像gif incase的图像，如果你有多个gif拆分图像。刚刚从一个在线工具拆分成GIF PNG个人，并把图像像的绘制如下顺序

image_1.png，image_2.png等

有处理程序，以动态地改变形象。

int imagePosition = 1; 
    Handler handler = new Handler(); 
     Runnable runnable = new Runnable() { 
      public void run() { 
       updateImage(); 
      } 
     }; 




    public void updateImage() { 

       appInstance.runOnUiThread(new Runnable() { 
        @Override 
        public void run() { 
         int resId = getResources().getIdentifier("image_" + imagePosition, "drawable", appInstance.getPackageName()); 
         gifImageViewDummy.setImageResource(resId); 
         imagePosition++; 
    //Consider you have 30 image for the anim 
         if (imagePosition == 30) { 
//this make animation play only once 
          handler.removeCallbacks(runnable); 

         } else { 
    //You can define your own time based on the animation 
          handler.postDelayed(runnable, 50); 
         } 

//to make animation to continue use below code and remove above if else 
// if (imagePosition == 30) 
//imagePosition = 1; 
// handler.postDelayed(runnable, 50); 
// 
        } 
       }); 
       } 

Answer 9

package com.example.studio.snakes; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.ImageView; 

import java.util.Random; 

public class MainActivity extends AppCompatActivity { 

int[] dices = { 
     R.drawable.one, 
     R.drawable.two, 
     R.drawable.three, 
     R.drawable.four, 
     R.drawable.five, 
     R.drawable.six, 
}; 


public void rollTapped(View view){ 
Log.i("Button","Button Tapped"); 
    Random rand = new Random(); 
    int randomnum = rand.nextInt(6); 
    Log.i("Random","Random number is " + randomnum); 
    ImageView dice=findViewById(R.id.imageView2); 
    dice.setImageResource(dices[randomnum]); 


} 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
} 
}