現在很多apk都有呼叫系統相機進行拍照和選擇系統相簿，GitHub和各大網站都有很多封裝的，這裡就不zb了！
直接上程式碼吧：拍照和選擇系統相簿都適配了7.0以上系統，程式碼都有註釋

“ private static final int TAKE_PHONE = 1;
private static final int CHOOSE_PHONE = 2;
private Button mTakePhoneBtn;
private ImageView mImagePic;
private Uri imageUri;
private Button mChoosePhoneBtn;
private File mPictureFile;
@Override
public void onClick(View v) {
int id = v.getId();
switch (id) {
// 拍照的點選事件
case R.id.take_phone:
//建立File物件 用於儲存拍照後的圖片
String fileName = DateFormat.format(“yyyyMMdd_hhmmss”, Calendar.getInstance(Locale.CHINA)) + “.jpg”;
mPictureFile = new File(Environment.getExternalStorageDirectory()
.getAbsolutePath()+”/picture”,fileName);
//判斷7.0以上系統（7.0以上對檔案的讀取做了限制 FileProvider特殊的內容提供器）
if(Build.VERSION.SDK_INT >=24) {
imageUri = FileProvider.getUriForFile(MainActivity.this,”android.support.datasave.fileprovider”,mPictureFile);
}else {
imageUri = Uri.fromFile(mPictureFile);
}
//啟動相機程式
Intent intent = new Intent(“android.media.action.IMAGE_CAPTURE”);
intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
startActivityForResult(intent,TAKE_PHONE);
break;

        case  R.id.choose_phone:
            //  選擇照片的點選事件
            /*對WRITE_WXTERNAL_STORAGE 執行時許可權進行動態申請*/
                if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                        != PackageManager.PERMISSION_GRANTED){
                    ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},CHOOSE_PHONE);
                }else {
                    openAlbum();
                }
            break;
        default:
            break;
    }
}

//開啟系統相簿
private void openAlbum() {
    Intent intent = new Intent("android.intent.action.GET_CONTENT");
    intent.setType("image/*");
    startActivityForResult(intent,CHOOSE_PHONE);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case  TAKE_PHONE:
            if(resultCode == RESULT_OK) {
                //result 返回的是-1 表示拍照成功 返回的是 0 表示拍照失敗
                //將拍攝的圖片顯示出來,並保持在本地檔案，通知系統相簿去更新
                try {
                    //將.jpg解析成bitmap
                    Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
                    mImagePic.setImageBitmap(bitmap);
                    Uri uri = Uri.fromFile(mPictureFile);
                    Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
                    intent.setData(uri);
                    this.sendBroadcast(intent);
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }
            break;
        case CHOOSE_PHONE:
            if(resultCode == RESULT_OK) {
                //判斷手機系統版本號
                if(Build.VERSION.SDK_INT >=19) {
                    //4.4版本以上，返回的是一個封裝過的uri，需要解析
                    handleImageOnkitKat(data);
                }else {
                    //4.4以下
                    handleImageBeforekitKat(data);
                }
            }
            break;
        default:
            break;
    }
}

private void handleImageBeforekitKat(Intent data) {
    Uri uri = data.getData();
    String imagePath = getImagePath(uri, null);
    disPlayImage(imagePath);
}

@TargetApi(19)
private void handleImageOnkitKat(Intent data) {
    String imagePath = null;
    Uri uri = data.getData();
    if(DocumentsContract.isDocumentUri(this,uri)) {
        //如果是document型別的uri，則通過document id處理
        String documentId = DocumentsContract.getDocumentId(uri);
        if("com.android.providers.media.documents".equals(uri.getAuthority())) {
            //解析出數字格式的id
            String id = documentId.split(":")[1];
            String selection = MediaStore.Images.Media._ID + "=" + id;
            imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,selection);
        }else if("com.android.providers.downloads.documents".equals(uri.getAuthority())) {
            Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(documentId));
            imagePath = getImagePath(contentUri,null);
        }
    }else if("content".equalsIgnoreCase(uri.getScheme())) {
        //如果是content型別的uri 則使用普通方式處理
        imagePath = getImagePath(uri,null);
    }else if("file".equalsIgnoreCase(uri.getScheme())) {
        //如果是file型別的uri 直接獲取圖片路徑即可
        imagePath = uri.getPath();
    }
    //根據圖片路徑顯示圖片
    disPlayImage(imagePath);
}
 

// 顯示圖片
private void disPlayImage(String imagePath) {
if(imagePath != null) {
Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
mImagePic.setImageBitmap(bitmap);
}else {
Toast.makeText(this,”獲取圖片失敗”,Toast.LENGTH_LONG).show();
}
}

private String getImagePath(Uri ContentUri, String selection) {
    String path = null;
    //通過uri和selection來獲取真實的圖片路徑
    Cursor cursor = getContentResolver().query(ContentUri, null, selection, null, null);
    if(cursor != null) {
        if(cursor.moveToFirst()) {
            path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
        }
        cursor.close();
    }
    return path;
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    switch (requestCode) {
        case CHOOSE_PHONE :
            if(grantResults.length>0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                openAlbum();
            }else {
                Toast.makeText(this,"您必須同意該許可權",Toast.LENGTH_LONG).show();
            }
            break;
    }
}

}`

“`

以上：適配了7.0以上系統 註釋已經很清楚了