使用来自外部存储器的文件路径设置ImageView图像

Question

您好我想更改我的ImageView的图像使用我保存在我的SQLite数据库的路径。那么我想实现的是每当图像可用时每秒运行一次，它将显示并保持到下一幅图像可用。但是，只要没有任何东西可以显示，就会使用默认图像。但现在我想解决的主要问题是我无法使用我拥有的路径设置imageView。我尝试了不同的解决方案，如从路径制作出位，但仍然收到了同样的错误是：E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /mnt/sdcard/Echo/Images/Awesome4 - 00:01.jpg: open failed: ENOENT (No such file or directory)

这里是我的代码，截至目前：

String path = db.getImagePath(file_name, curTime); 

          Log.v("Your image filename", file_name); 
          Log.v("Your currentPosition", curTime); 

          Log.v("Your Path Playback edit", path); 

          try{ 
           preview.setImageURI(Uri.parse(Environment.getExternalStorageDirectory()+"/Echo/Images/"+file_name)); 
          }catch (Exception e){ 
           e.printStackTrace(); 
           preview.setImageResource(R.drawable.sample_image); 
          } 

这将运行在一个可运行的方法。而这里的logcat的我得到：

V/Your Path: /mnt/sdcard/Echo/Images/ 
V/Your image filename: Awesome4 - 00:01.jpg 
V/Your currentPosition: 00:01 
V/Your Path Playback edit: /mnt/sdcard/Echo/Images/ 
E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /mnt/sdcard/Echo/Images/Awesome4 - 00:01.jpg: open failed: ENOENT (No such file or directory) 
I/System.out: resolveUri failed on bad bitmap uri: /mnt/sdcard/Echo/Images/Awesome4 - 00:01.jpg 
D/dalvikvm: GC_CONCURRENT freed 380K, 14% free 3067K/3560K, paused 74ms+3ms, total 226ms 
V/Your image filename: Awesome4 - 00:02.jpg 
V/Your currentPosition: 00:02 
V/Your Path Playback edit: [ 06-27 04:14:07.691 6043: 6043 E/BitmapFactory ] 
/mnt/sdcard/Echo/Images/Awesome4 - 00:02.jpg: open failed: ENOENT (No such file or directory) 

Answer 1

检查这一点，如果它可以帮助你。

preview.setImageURI(Uri.parse(Environment.getExternalStorageDirectory().getAbsolutePath()+"/Echo/Images/"+file_name)); 

我不知道怎么做...

public final static String APP_PATH_SD_CARD = "/DesiredSubfolderName/"; 
public final static String APP_THUMBNAIL_PATH_SD_CARD = "thumbnails"; 

public boolean saveImageToExternalStorage(Bitmap image) { 
String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath() + APP_PATH_SD_CARD + APP_THUMBNAIL_PATH_SD_CARD; 

try { 
File dir = new File(fullPath); 
if (!dir.exists()) { 
dir.mkdirs(); 
} 

OutputStream fOut = null; 
File file = new File(fullPath, "desiredFilename.png"); 
file.createNewFile(); 
fOut = new FileOutputStream(file); 

// 100 means no compression, the lower you go, the stronger the compression 
image.compress(Bitmap.CompressFormat.PNG, 100, fOut); 
fOut.flush(); 
fOut.close(); 

MediaStore.Images.Media.insertImage(context.getContentResolver(), file.getAbsolutePath(), file.getName(), file.getName()); 

return true; 

} catch (Exception e) { 
Log.e("saveToExternalStorage()", e.getMessage()); 
return false; 
} 
}