1.Android6.0系統，對於許可權的使用都是需要申請，選擇圖片和拍照需要申請Manifest.permission.CAMERA, Manifest.permission.READ_EXTERNAL_STORAGE這兩個許可權。

if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions((Activity) this,
                    new String[] { Manifest.permission
 
.CAMERA, Manifest.permission.READ_EXTERNAL_STORAGE},
                    REQUEST_STORAGE_READ_ACCESS_PERMISSION);
        }

2.通過圖片選擇器MultiImageSelector來管理: 選擇模式、最大選擇數量、是否啟動相機等功能。

3.點選圖片選擇按鈕跳轉到MultiImageSelectorActivity類，其佈局如下：（一個Toobar + 一個FrameLayout）

<?xml version="1.0" encoding="utf-8"?>
 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:background="#181819"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.Toolbar
 
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/mis_actionbar_color"
        app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        android:minHeight="?android:attr/actionBarSize">

        <Button
            android:id="@+id/commit"
            android:background="@drawable/mis_action_btn"
            android:minHeight="1dp"
            android:minWidth="1dp"
            android:layout_marginRight="16dp"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:paddingTop="5dp"
            android:paddingBottom="5dp"
            android:textColor="@color/mis_default_text_color"
            android:textSize="14sp"
            android:layout_gravity="right"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </android.support.v7.widget.Toolbar>

    <FrameLayout
        android:id="@+id/image_grid"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

4.呼叫如下方法填充展示圖片的fragment（MultiImageSelectorFragment）。

         getSupportFragmentManager().beginTransaction()
                    .add(R.id.image_grid, Fragment.instantiate(this, MultiImageSelectorFragment.class.getName(), bundle))
                    .commit();

4.MultiImageSelectorFragment佈局用gridview顯示從相簿獲取的圖片

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="@android:color/black"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <GridView
        android:id="@+id/grid"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:horizontalSpacing="@dimen/mis_space_size"
        android:verticalSpacing="@dimen/mis_space_size"
        android:paddingBottom="?android:attr/actionBarSize"
        android:clipToPadding="false"
        android:numColumns="3"/>

    <RelativeLayout
        android:clickable="true"
        android:id="@+id/footer"
        android:background="#cc000000"
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:layout_height="?android:attr/actionBarSize">

        <Button
            android:id="@+id/category_btn"
            android:paddingLeft="16dp"
            android:paddingRight="16dp"
            android:layout_centerVertical="true"
            android:textColor="@color/mis_folder_text_color"
            tools:text="所有圖片"
            android:textSize="16sp"
            android:gravity="center_vertical"
            android:drawableRight="@drawable/mis_text_indicator"
            android:drawablePadding="5dp"
            android:background="@null"
            android:singleLine="true"
            android:ellipsize="end"
            android:layout_width="wrap_content"
            android:layout_height="match_parent" />

        </RelativeLayout>

</RelativeLayout>

5.呼叫android.support.v4.app.LoaderManager.class類裡面的LoaderCallbacks方法，等載入完成後給mImageAdapter設定資料。

mImageAdapter.setData(images);

6.當允許拍照的時候，顯示拍照按鈕，呼叫系統相機功能。

 mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                if (mImageAdapter.isShowCamera()) {
                    if (i == 0) {
                        showCameraAction();
                    } else {
                        Image image = (Image) adapterView.getAdapter().getItem(i);
                        selectImageFromGrid(image, mode);
                    }
                } else {
                    Image image = (Image) adapterView.getAdapter().getItem(i);
                    selectImageFromGrid(image, mode);
                }
            }
        });

呼叫相機功能

  /**
     * Open camera
     */
    private void showCameraAction() {
        if(ContextCompat.checkSelfPermission(getContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED){
            requestPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE,
                    getString(R.string.mis_permission_rationale_write_storage),
                    REQUEST_STORAGE_WRITE_ACCESS_PERMISSION);
        }else {
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if (intent.resolveActivity(getActivity().getPackageManager()) != null) {
                try {
                    mTmpFile = FileUtils.createTmpFile(getActivity());
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (mTmpFile != null && mTmpFile.exists()) {
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mTmpFile));
                    startActivityForResult(intent, REQUEST_CAMERA);
                } else {
                    Toast.makeText(getActivity(), R.string.mis_error_image_not_exist, Toast.LENGTH_SHORT).show();
                }
            } else {
                Toast.makeText(getActivity(), R.string.mis_msg_no_camera, Toast.LENGTH_SHORT).show();
            }
        }
    }

選擇圖片

  /**
     * notify callback
     * @param image image data
     */
    private void selectImageFromGrid(Image image, int mode) {
        if(image != null) {
            if(mode == MODE_MULTI) {
                if (resultList.contains(image.path)) {
                    resultList.remove(image.path);
                    if (mCallback != null) {
                        mCallback.onImageUnselected(image.path);
                    }
                } else {
                    if(selectImageCount() == resultList.size()){
                        Toast.makeText(getActivity(), R.string.mis_msg_amount_limit, Toast.LENGTH_SHORT).show();
                        return;
                    }
                    resultList.add(image.path);
                    if (mCallback != null) {
                        mCallback.onImageSelected(image.path);
                    }
                }
                mImageAdapter.select(image);
            }else if(mode == MODE_SINGLE){
                if(mCallback != null){
                    mCallback.onSingleImageSelected(image.path);
                }
            }
        }
    }