相关疑难解决方法(0)

我想将图像从URL保存到SD卡(以备将来使用),然后从SD卡加载该图像,将其用作Google地图的可绘制叠加层.

这是函数的保存部分:

//SAVE TO FILE

String filepath = Environment.getExternalStorageDirectory().getAbsolutePath(); 
String extraPath = "/Map-"+RowNumber+"-"+ColNumber+".png";
filepath += extraPath;

FileOutputStream fos = null;
fos = new FileOutputStream(filepath); 

bmImg.compress(CompressFormat.PNG, 75, fos);

//LOAD IMAGE FROM FILE
Drawable d = Drawable.createFromPath(filepath);
return d;

图像以succuessfully的形式保存到SD卡,但在到达createFromPath()线路时失败.我不明白为什么它会保存到那个目的地但不加载它....

我想在我的代码中使用按钮保存URL中的图像我已经创建了目标文件夹,但我尝试了各种代码来保存图片但是什么都不起作用:

public class B_X extends Activity {   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.bx);

        Button buttonSetWallpaper = (Button)findViewById(R.id.bSetWall);
        buttonSetWallpaper.setOnClickListener(new Button.OnClickListener(){

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                File folder = new File(Environment.getExternalStorageDirectory() + "/PerfectAss/");
                boolean success = false;
                if (!folder.exists()) {
                    success = folder.mkdirs();
                }

                if (!success) {
            } else {
            }

                 Toast.makeText(getApplicationContext(), "The image has been saved", Toast.LENGTH_LONG).show();
                    URL url = new URL ("http://bitsparrow.altervista.org/wp-content/uploads/2013/04/5.jpg");
                    InputStream input = url.openStream();
                     try …