//创建file文件，用于存储相机拍下的照片,这里我命名为my_head_image.jpg，并将它放在//手机SD卡的应用关联缓存中。 /*  File outputImage = new File(getExternalCacheDir(), "my_head_image.jpg");try {if (outputImage.exists()) {outputImage.delete();}outputImage.createNewFile();} catch (IOException e) {e.printStackTrace();}
//将File对象转换为Uri对象，先进行系统版本的判定，Android7.0以后的版本和之前的版本不//太一样  if (Build.VERSION.SDK_INT >= 24) {imageUri = FileProvider.getUriForFile(ChangeMyDetails.this, "com.example.write.fileprovider", outputImage);} else {imageUri = Uri.fromFile(outputImage);*/

　　　　File outputImage = new File(Environment.getExternalStorageDirectory(), "my_head_image.jpg");　　　　String path = outputImage.getAbsolutePath();　　　　Log.i("ChangeMyDetails", "outputImage路径为 "+path);　　　　try {   　　　　 if (outputImage.exists()) {    　　　　    outputImage.delete();   　　　　 }  　　　　  outputImage.createNewFile();　　　　} catch (IOException e) { 　　　　   e.printStackTrace();　　　　}

　　　　imageUri = Uri.fromFile(outputImage);

  //启动相机程序                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);                startActivityForResult(intent, TAKE_PHOTO);

<providerandroid:name="android.support.v4.content.FileProvider"android:authorities="com.example.write.fileprovider"android:exported="false"android:grantUriPermissions="true"><meta-dataandroid:name="android.support.FILE_PROVIDER_PATHS"android:resource="@xml/provider_paths"/></provider>

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android"><external-path name="my_images" path="."/>
</paths>

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {//用户没有进行有效的操作，返回if (requestCode == RESULT_CANCELED) {Toast.makeText(getApplication(), "取消", Toast.LENGTH_LONG).show();return;}switch (requestCode) {case FROM_GALLERY:if (resultCode == RESULT_OK) {if (Build.VERSION.SDK_INT >= 19) {//4.4以上系统使用
                        handleImageOnKitKat(data);} else {handleImageBeforeKitKat(data);}}break;case TAKE_PHOTO://   裁剪照片cropRawPhoto(imageUri);         break;case RESULT_REQUEST_CODE: if (cropImgUri !=null) {try {Bitmap headImage = BitmapFactory.decodeStream(getContentResolver().openInputStream(cropImgUri));headImageButton.setImageBitmap(headImage);} catch (Exception e) {e.printStackTrace();}}else {Toast.makeText(this,"cropImgUri为空！",Toast.LENGTH_SHORT).show();}break;}}

public void cropRawPhoto(Uri uri) {//创建file文件，用于存储剪裁后的照片        File cropImage = new File(Environment.getExternalStorageDirectory(), "crop_image.jpg");        String path = cropImage.getAbsolutePath();      try {            if (cropImage.exists()) {                cropImage.delete();            }          cropImage.createNewFile();     } catch (IOException e) {           e.printStackTrace();        }        cropImgUri = Uri.fromFile(cropImage);        Intent intent = new Intent("com.android.camera.action.CROP");//设置源地址uri        intent.setDataAndType(imageUri, "image/*");        intent.putExtra("crop", "true");        intent.putExtra("aspectX", 1);        intent.putExtra("aspectY", 1);        intent.putExtra("outputX", 200);        intent.putExtra("outputY", 200);        intent.putExtra("scale", true);//设置目的地址uri        intent.putExtra(MediaStore.EXTRA_OUTPUT, cropImgUri);//设置图片格式        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());        intent.putExtra("return-data", false);        intent.putExtra("noFaceDetection", true); // no face detection        startActivityForResult(intent, RESULT_REQUEST_CODE);    }

StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();StrictMode.setVmPolicy(builder.build());if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {builder.detectFileUriExposure();}