使用外部存储器中的文件路径设置ImageView图像

Question

嗨,我想使用我保存在SQLite数据库中的路径更改ImageView的图像.那么我想要实现的是每当这个图像可用时每秒运行它将显示并保持到下一个图像可用.但是,无论什么都没有显示,都会使用默认图像.但是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,例如从路径中取出位图但仍然收到相同的错误,即: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)

这是我现在的代码:

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);
                            }

这是在一个可运行的方法下运行的.这是我得到的logcat:

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

检查这是否有帮助.

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

我是怎么做的......

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;
}
}