java 安卓_从SD卡获取图片

Question

拍照​​SD卡的路径。 我的照片名是01。jpg

确保图片在SD卡中

public boolean fileIsExists(){
    try{
        File f1 = new File("/sdcard/01.jpg");   
        f1 = new File("01.jpg");
        if(!f1.exists()){
            return true;
        }
    }catch (Exception e) {
        // TODO: handle exception
        return false;
    }
    return true;
}
boolean file1 = fileIsExists();

如果图片在SD卡内，则将图片放入imageview

错误在下面的代码中

if (file1==true){
    imageView = (ImageView)findViewById(R.id.image_view);

    String myJpgPath = "/sdcard/01.jpg";
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = 0;
   Bitmap bitmap = BitmapFactory.decodeFile(myJpgPath, options);//error here Cellphone can't run
    imageView.setImageBitmap(bitmap);
}

Answer 1

试试下面的代码

File f = new File("/mnt/sdcard/01.jpg");
ImageView mImgView1 = (ImageView)findViewById(R.id.imageView);
Bitmap bmp = BitmapFactory.decodeFile(f.getAbsolutePath());
mImgView1.setImageBitmap(bmp);

Answer 2

更改+“sdcard/01.jpg”；至+“/01.jpg”

（并确保位图不重复局部变量。）

if (file1==true){
    String myJpgPath = Environment.getExternalStorageDirectory().getAbsolutePath()+"/01.jpg";
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = 0;
    Bitmap bitmap = BitmapFactory.decodeFile(myJpgPath, options);
    imageView.setImageBitmap(bitmap);
}

Answer 3

按如下方式设置路径：

String myJpgPath = Environment.getExternalStorageDirectory().getAbsolutePath()+"folderName/01.jpg";