如何获得android assert 里图片的绝对路径

第一种方法：

String path = "file:///android_asset/文件名";

第二种方法：

InputStream abpath = getClass()getResourceAsStream("/assets/文件名");

若要想要转换成String类型

String path = new String(InputStreamToByte(abpath ));

private byte[] InputStreamToByte(InputStream is) throws IOException {

ByteArrayOutputStream bytestream = new ByteArrayOutputStream();

int ch;

while ((ch = isread()) != -1) {

bytestreamwrite(ch);

}

byte imgdata[] = bytestreamtoByteArray();

bytestreamclose();

return imgdata;

}

public class TestCameraActivity extends Activity implements OnClickListener{    private Uri mOutPutFileUri;

 @Override

    public void onCreate(Bundle savedInstanceState) {

        superonCreate(savedInstanceState);

        setContentView(Rlayoutmain);

        Button takePiCButton = (Button) thisfindViewById(Ridbutton1);

        takePiCButtonsetOnClickListener(this);

    }

@Override

 public void onClick(View v) {

  switch (vgetId()) {

  case Ridbutton1:

   saveFullImage();

   break;

default:

   break;

  }

 }

 private void saveFullImage(){

  Intent intent = new Intent(MediaStoreACTION_IMAGE_CAPTURE);

  //文件夹aaaa

  String path = EnvironmentgetExternalStorageDirectory()toString()+"/aaaa";

  File path1 = new File(path);

  if(!path1exists()){

   path1mkdirs();

  }

  File file = new File(path1,SystemcurrentTimeMillis()+"jpg");

  mOutPutFileUri = UrifromFile(file);

  intentputExtra(MediaStoreEXTRA_OUTPUT, mOutPutFileUri);

  startActivityForResult(intent, 1);

 }

 @Override

 protected void onActivityResult(int requestCode, int resultCode, Intent data) {

  superonActivityResult(requestCode, resultCode, data);

  if(requestCode == 1){

   Uri imageUri = null;

   if(data != null){

    if(datahasExtra("data")){

     Bitmap thunbnail = datagetParcelableExtra("data");

     //处理缩略图

    }

   }else{

    //处理mOutPutFileUri中的完整图像

   }

  }

 }

}

直接调用文件管理器选择即可。

1、调用系统提供的选择器，代码如下：

//注意，在Android44系统下建议使用 IntentACTION_OPEN_DOCUMENT方式

if (UtilityisKK()) {

Intent intent = new Intent(IntentACTION_OPEN_DOCUMENT);

intentaddCategory(IntentCATEGORY_OPENABLE);

intentsetType("image

public static String getDataColumn(Context context, Uri uri, String selection,

String[] selectionArgs) {

Cursor cursor = null;

final String column = "_data";

final String[] projection = {

column

};

处理返回结果：

protected void onActivityResult(int requestCode, int resultCode,

Intent intent) {

superonActivityResult(requestCode, resultCode, intent);

if (resultCode == RESULT_OK) {

switch (requestCode) {

case PIC_RESULT://选择图库

case PIC_RESULT_KK:

imageFileUri = intentgetData();//获取选择的URI

break;

｝

｝

2、除此自外，系统还提供一种选择器，这个选择器可以屏蔽掉那个auto backup的目录所以就开始打算用这个选择器来选了

Intent intent=new Intent(IntentACTION_GET_CONTENT);//ACTION_OPEN_DOCUMENT

intentaddCategory(IntentCATEGORY_OPENABLE);

intentsetType("image/jpeg");

if(androidosBuildVERSIONSDK_INT>=androidosBuildVERSION_CODESKITKAT){

startActivityForResult(intent, SELECT_PIC_KITKAT);

}else{

startActivityForResult(intent, SELECT_PIC);

}

为什么要分开不同版本呢其实在43或以下可以直接用ACTION_GET_CONTENT的,在44或以上,官方建议用ACTION_OPEN_DOCUMENT,主要区别是他们返回的Uri43返回的是带文件路径的,而44返回的却是content://comandroidprovidersmediadocuments/document/image:3951这样的,没有路径,只有编号的uri可以通过以下方式，处理URI。

参考：Android 44从图库选择,获取路径并裁剪

public static String getPath(final Context context, final Uri uri) {

final boolean isKitKat = BuildVERSIONSDK_INT >= BuildVERSION_CODESKITKAT;

// DocumentProvider

if (isKitKat && DocumentsContractisDocumentUri(context, uri)) {

// ExternalStorageProvider

if (isExternalStorageDocument(uri)) {

final String docId = DocumentsContractgetDocumentId(uri);

final String[] split = docIdsplit(":");

final String type = split[0];

if ("primary"equalsIgnoreCase(type)) {

return EnvironmentgetExternalStorageDirectory() + "/" + split[1];

}

// TODO handle non-primary volumes

}

// DownloadsProvider

else if (isDownloadsDocument(uri)) {

final String id = DocumentsContractgetDocumentId(uri);

final Uri contentUri = ContentUriswithAppendedId(

Uriparse("content://downloads/public_downloads"), LongvalueOf(id));

return getDataColumn(context, contentUri, null, null);

}

// MediaProvider

else if (isMediaDocument(uri)) {

final String docId = DocumentsContractgetDocumentId(uri);

final String[] split = docIdsplit(":");

final String type = split[0];

Uri contentUri = null;

if ("image"equals(type)) {

contentUri = MediaStoreImagesMediaEXTERNAL_CONTENT_URI;

} else if ("video"equals(type)) {

contentUri = MediaStoreVideoMediaEXTERNAL_CONTENT_URI;

} else if ("audio"equals(type)) {

contentUri = MediaStoreAudioMediaEXTERNAL_CONTENT_URI;

}

final String selection = "_id=";

final String[] selectionArgs = new String[] {

split[1]

};

return getDataColumn(context, contentUri, selection, selectionArgs);

}

}

// MediaStore (and general)

else if ("content"equalsIgnoreCase(urigetScheme())) {

// Return the remote address

if (isGooglePhotosUri(uri))

return urigetLastPathSegment();

return getDataColumn(context, uri, null, null);

}

// File

else if ("file"equalsIgnoreCase(urigetScheme())) {

return urigetPath();

}

return null;

}

public static String getDataColumn(Context context, Uri uri, String selection,

String[] selectionArgs) {

Cursor cursor = null;

final String column = "_data";

final String[] projection = {

column

};

try {

cursor = contextgetContentResolver()query(uri, projection, selection, selectionArgs,

null);

if (cursor != null && cursormoveToFirst()) {

final int index = cursorgetColumnIndexOrThrow(column);

return cursorgetString(index);

}

} finally {

if (cursor != null)

cursorclose();

}

return null;

}

public static boolean isExternalStorageDocument(Uri uri) {

return "comandroidexternalstoragedocuments"equals(urigetAuthority());

}

public static boolean isDownloadsDocument(Uri uri) {

return "comandroidprovidersdownloadsdocuments"equals(urigetAuthority());

}

public static boolean isMediaDocument(Uri uri) {

return "comandroidprovidersmediadocuments"equals(urigetAuthority());

}

public static boolean isGooglePhotosUri(Uri uri) {

return "comgoogleandroidappsphotoscontent"equals(urigetAuthority());

}

3、使用其它开源组件如PhotoView。

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