我正在尝试将位图添加到我的目录中。它保存了图像，但我得到了这个奇怪的错误，这是蓝色的写作。
ample.myapplication W/System.err﹕ java.io.FileNotFoundException: /CameraApp: open failed: EROFS (Read-only file system)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at libcore.io.IoBridge.open(IoBridge.java:409)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at java.io.FileOutputStream.<init>(FileOutputStream.java:128)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at java.io.FileOutputStream.<init>(FileOutputStream.java:117)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at com.example.myapplication.MainActivity.save_btn(MainActivity.java:119)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at android.view.View$1.onClick(View.java:3825)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at android.view.View.performClick(View.java:4445)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at android.view.View$PerformClick.run(View.java:18446)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:733)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at android.os.Looper.loop(Looper.java:136)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5146)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ Caused by: libcore.io.ErrnoException: open failed: EROFS (Read-only file system)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at libcore.io.Posix.open(Native Method)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ at libcore.io.IoBridge.open(IoBridge.java:393)
04-23 17:07:26.259 12120-12120/com.example.myapplication W/System.err﹕ ... 18 more
这是用于保存位图的代码。单击save_btn按钮时，它将运行该代码。
public void save_btn(View v) {
FileOutputStream out = null;
try {
out = new FileOutputStream(filename);
image.compress(Bitmap.CompressFormat.PNG, 100, out);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle("Saved");
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
alertDialog.show();
}
}
相机意图
public void capture_btn(View v) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File file = new File(Environment.getExternalStorageDirectory() + File.separator + "image.jpg");
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
答案 0 :(得分：1)
尝试使用此代码段：
public static final int MEDIA_TYPE_IMAGE = 1;
public static final int MEDIA_TYPE_VIDEO = 2;
/** Create a File for saving an image or video */
public static File getOutputMediaFile(int type){
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "App");
// This locat ion works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
android.util.Log.d("log", "failed to create directory");
return null;
}
}
// Create a media file name
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_"+ "IdelityPhotoTemp" + ".png");
} else if(type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"VID_"+ "idelityVideoTemp" + ".mp4");
} else {
return null;
}
return mediaFile;
}
然后：
try {
File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null){
android.util.Log.d("log", "Error creating media file, check storage permissions");
return null;
}
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(photoData);
fos.close();
} catch (FileNotFoundException e) {
android.util.Log.d("log", "File not found: " + e.getMessage());
} catch (IOException e) {
android.util.Log.d("log", "Error accessing file: " + e.getMessage());
}
如果您使用相机中的Intent，则可以在下一个link
中使用该方法