android根据路径获取图片路径
Ⅰ Android 在知道文件路径以及文件名称读取SD卡上的图片该怎么做
不知道你是想读取出来干嘛,
但是读取sd卡的图片文件第一步要获取图片的绝对路径,
Environment.getExternalStorageDirectory().toString()就是获取sd卡的绝对路径,由于android各个版本不同,返回的路径也可能不相同,
String imgFilePath = Environment.getExternalStorageDirectory().toString()
+ “/DCIM/device.png
得到图片的绝对路径以后,可以通过流读取这个文件,如果你只是想显示到界面的话,那可以使用BitmapFactory来构建一个Bitmap对象,这个对象是可以直接应用于imageView的
创建方法BitmapFactory.decodeFile("图片路径")
Ⅱ android怎么从sd卡指定的文件夹中获取所有图片的路径URL，谢谢～感谢各位大神了
直接调用文件管理器选择图片即可。
1、调用系统提供的图片选择器，代码如下：
//注意，在Android4.4系统下建议使用 Intent.ACTION_OPEN_DOCUMENT方式
if (Utility.isKK()) {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("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) {
super.onActivityResult(requestCode, resultCode, intent);
if (resultCode == RESULT_OK) {
switch (requestCode) {
case PIC_RESULT://选择图库
case PIC_RESULT_KK:
imageFileUri = intent.getData();//获取选择图片的URI
break;
｝
｝
2、除此自外，系统还提供一种选择器，这个图片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图片选择器来选图片了.
Intent intent=new Intent(Intent.ACTION_GET_CONTENT);//ACTION_OPEN_DOCUMENT
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/jpeg");
if(android.os.Build.VERSION.SDK_INT>=android.os.Build.VERSION_CODES.KITKAT){
startActivityForResult(intent, SELECT_PIC_KITKAT);
}else{
startActivityForResult(intent, SELECT_PIC);
}
为什么要分开不同版本呢?其实在4.3或以下可以直接用ACTION_GET_CONTENT的,在4.4或以上,官方建议用ACTION_OPEN_DOCUMENT,主要区别是他们返回的Uri.4.3返回的是带文件路径的,而4.4返回的却是content://com.android.providers.media.documents/document/image:3951这样的,没有路径,只有图片编号的uri.可以通过以下方式，处理URI。
参考：Android 4.4从图库选择图片,获取图片路径并裁剪
public static String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
// TODO handle non-primary volumes
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_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(uri.getScheme())) {
// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
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 = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
3、使用其它开源组件如PhotoView。
Ⅲ android 怎么获取相册路径
android手机4.2版本之前是一个方法，大于4.2版本又是一个方法。
注意：现在手机市场android版本2015面上半年平均4.4，现在是平均5.0了。
before
你网络一下，都能查到，很简单.
after
private void startPickPhotoActivity() {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.setType("image/*"); // Or 'image/ jpeg '
startActivityForResult(intent, RESULT_PICK_PHOTO_NORMAL);
}
// 获得图片返回的路径
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
if (requestCode == RESULT_PICK_PHOTO_NORMAL) {
if (resultCode == RESULT_OK && data != null) {
//选中图片路径
mFileName = MainActivity.getPath(getApplicationContext(),
data.getData());
if ("".equals(mFileName)) {
return;
}
Intent intent = new Intent(this, EditActivity.class);
intent.putExtra("pathName", mFileName);
startActivity(intent);
}
}
}
@TargetApi(Build.VERSION_CODES.KITKAT)
public static String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (UriUtils.isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/"
+ split[1];
}
}
// DownloadsProvider
else if (UriUtils.isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"),
Long.valueOf(id));
return UriUtils.getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (UriUtils.isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
final String selection = MediaColumns._ID + "=?";
final String[] selectionArgs = new String[] { split[1] };
return UriUtils.getDataColumn(context, contentUri, selection,
selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
// Return the remote address
if (UriUtils.isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return UriUtils.getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
Ⅳ android小程序，从数据库中读取图片路径然后进行显示，不是背景图片
感觉这样应该可以，
先从数据库里面获得
这个图片的绝对路径
然后
使用UIL类
URL
url=new
URL(file:///路径);
然后得到这个文件的输入流InputStream
in=url.openStream();
然后得到此图片的位图Bitmap
bitmap=BitmapFactory.decodeStream(in);
ImageView
img=new
ImageView(this);
img.setImageBitmap(bitmap);
从网络上的话是这样，但是手机上是不是这样就不清楚了你可以试一下。
那个图片应该是要放在手机上。
Ⅳ 安卓从手机相册获取照片作为头像缓存地址
* 1、实现原理:用户打开相册或相机选择相片后,相片经过压缩并设置在控件上,图片在本地sd卡存一份(如果有的话,没大桐有则内部存储,所以还
* 需要判断用户是否挂载了sd卡),然后在服务器上存储一份该图片,当下次再次启桐则动应用时,会默认去sd卡加载该图片,如果本地没有,再会去联网请求
* 2、使用了picasso框架以及自定义BitmapUtils工具类
* 3、记得加上相关权局仿棚限
* <uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
* */
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private ImageView iv;//要设置的头像
private Button btn_photo;//调用相册按钮
private Button btn_camera;//调用相机按钮
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv=(ImageView) findViewById(R.id.iv);
btn_photo = (Button) findViewById(R.id.btn_photo);
btn_camera = (Button) findViewById(R.id.btn_camera);
btn_photo.setOnClickListener(this);
btn_camera.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_photo://打开系统相册
Intent intent=new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent,100);
break;
case R.id.btn_camera://打开系统相机
Intent intent2=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent2,200);
break;
}
}
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==100&&resultCode==RESULT_OK&&data!=null){//系统相册
Uri imageData = data.getData();
String path=getPath(imageData);
Bitmap bitmap = BitmapFactory.decodeFile(path);
Bitmap bitmap1 = BitmapUtils.zoom(bitmap, iv.getWidth(), iv.getHeight());
Bitmap bitmap2 = BitmapUtils.circleBitmap(bitmap1);
//加载显示
iv.setImageBitmap(bitmap2);
//bitmap图片上传到服务器......
//bitmap图片保存到本地
saveImage(bitmap2);
}else if(requestCode==200&&resultCode==RESULT_OK&&data!=null){//系统相机
Bitmap bitmap = (Bitmap) data.getExtras().get("data");
BitmapUtils.zoom(bitmap,iv.getWidth(),iv.getHeight());
bitmap=BitmapUtils.circleBitmap(bitmap);
//加载显示
iv.setImageBitmap(bitmap);
//bitmap图片上传到服务器......
//bitmap图片保存到本地
saveImage(bitmap);
}
}
/**
* 数据的存储。（5种）
* Bimap:内存层面的图片对象。
*
* 存储--->内存：
* BitmapFactory.decodeFile(String filePath);
* BitmapFactory.decodeStream(InputStream is);
* 内存--->存储：
* bitmap.compress(Bitmap.CompressFormat.PNG,100,OutputStream os);
*/
private void saveImage(Bitmap bitmap) {
File filesDir;
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){//判断sd卡是否挂载
//路径1：storage/sdcard/Android/data/包名/files
filesDir = this.getExternalFilesDir("");
}else{//手机内部存储
//路径：data/data/包名/files
filesDir = this.getFilesDir();
}
FileOutputStream fos = null;
try {
File file = new File(filesDir,"icon.png");
fos = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 100,fos);
} catch (FileNotFoundException e) {
e.printStackTrace();
}finally{
if(fos != null){
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
//如果本地有,就不需要再去联网去请求
private boolean readImage() {
File filesDir;
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){//判断sd卡是否挂载
//路径1：storage/sdcard/Android/data/包名/files
filesDir = getExternalFilesDir("");
}else{//手机内部存储
//路径：data/data/包名/files
filesDir = getFilesDir();
}
File file = new File(filesDir,"icon.png");
if(file.exists()){
//存储--->内存
Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
iv.setImageBitmap(bitmap);
return true;
}
return false;
}
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
private String getPath(Uri uri) {
int sdkVersion = Build.VERSION.SDK_INT;
//高于4.4.2的版本
if (sdkVersion >= 19) {
Log.e("TAG", "uri auth: " + uri.getAuthority());
if (isExternalStorageDocument(uri)) {
String docId = DocumentsContract.getDocumentId(uri);
String[] split = docId.split(":");
String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
} else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),
Long.valueOf(id));
return getDataColumn(this, contentUri, null, null);
} else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[]{split[1]};
return getDataColumn(this, contentUri, selection, selectionArgs);
} else if (isMedia(uri)) {
String[] proj = {MediaStore.Images.Media.DATA};
Cursor actualimagecursor = this.managedQuery(uri, proj, null, null, null);
int actual_image_column_index = actualimagecursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
actualimagecursor.moveToFirst();
return actualimagecursor.getString(actual_image_column_index);
}
} else if ("content".equalsIgnoreCase(uri.getScheme())) {
// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(this, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
/**
* uri路径查询字段
*
* @param context
* @param uri
* @param selection
* @param selectionArgs
* @return
*/
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 = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
private boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
public static boolean isMedia(Uri uri) {
return "media".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
/**
* 判断本地是否有该图片,没有则去联网请求
* */
@Override
protected void onResume() {
super.onResume();
if(readImage()){
return;
}
}
}
//BitmapUtils工具类public class BitmapUtils { /**
* 该方法用于将图片进行圆形处理
* */ public static Bitmap circleBitmap(Bitmap source){ //默认只对宽进行处理 int width=source.getWidth(); Bitmap bitmap=Bitmap.createBitmap(width,width,Bitmap.Config.ARGB_8888); Canvas canvas=new Canvas(bitmap); Paint paint=new Paint(); //设置抗锯齿 paint.setAntiAlias(true); canvas.drawCircle(width/2,width/2,width/2,paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(source,0,0,paint); return bitmap; } /** * 该方法用于图片压缩处理,注意width、height参数的类型必须是float * */ public static Bitmap zoom(Bitmap source,float width,float height){ Matrix matrix=new Matrix(); //图片进行压缩处理 matrix.postScale(width/source.getWidth(),height/source.getHeight()); Bitmap bitmap = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, false); return bitmap; }}
以上所述是小编给大家介绍的Android实现调用系统图库与相机设置头像并保存在本地及服务器 ，希望对大家有所帮助
Ⅵ Android开发，图库获取图片路径
public class TestCameraActivity extends Activity implements OnClickListener{ private Uri mOutPutFileUri; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button takePiCButton = (Button) this.findViewById(R.id.button1); takePiCButton.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.button1: saveFullImage(); break; default: break; } } private void saveFullImage(){ Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //文件夹aaaa String path = Environment.getExternalStorageDirectory().toString()+"/aaaa"; File path1 = new File(path); if(!path1.exists()){ path1.mkdirs(); } File file = new File(path1,System.currentTimeMillis()+".jpg"); mOutPutFileUri = Uri.fromFile(file); intent.putExtra(MediaStore.EXTRA_OUTPUT, mOutPutFileUri); startActivityForResult(intent, 1); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if(requestCode == 1){ Uri imageUri = null; if(data != null){ if(data.hasExtra("data")){ Bitmap thunbnail = data.getParcelableExtra("data"); //处理缩略图 } }else{ //处理mOutPutFileUri中的完整图像 } } } }
Ⅶ 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 = is.read()) != -1) {
bytestream.write(ch);
}
byte imgdata[] = bytestream.toByteArray();
bytestream.close();
return imgdata;
}
Ⅷ 安卓怎么根据图片路径调用系统相册查看这个图片
//使用Intent
Intent intent = new Intent(Intent.ACTION_VIEW);
//Uri mUri = Uri.parse("file://" + picFile.getPath());Android3.0以后最好不要通过该方法，存在一些小Bug
intent.setDataAndType(Uri.fromFile(picFile), "image/*");
startActivity(intent);