先看效果圖。

直接上程式碼。主要是Adapter這邊。

public class GvAdapter extends BaseAdapter{
    private Context context;
    private int mMaxPosition;//根據這個list.size+1 來進行判斷
    private List<String> list;

    public GvAdapter(Context context, List<String> list) {
        this.context = context;
        this
 
.list = list;
    }

    @Override
    public int getCount() {
        mMaxPosition=list.size()+1;
        return mMaxPosition;
    }
    //根據情況可以設定是否需要。。
    public int getMaxPosition(){
        return mMaxPosition;
    }
    @Override
    public Object getItem(int position) {
        return list.get(position);
    }
    @Override
 

    public long getItemId(int position) {
        return position;
    }
    @Override
    public View getView(final int position, View v, ViewGroup
            parent) {
        ViewHolder vh=null;
        if (v==null){
            vh=new ViewHolder();
            v= LayoutInflater.from(context).inflate(R.layout.item_gd,parent,false
 
);
            vh.img= (ImageView) v.findViewById(R.id.img);
            vh.demimg= (ImageView) v.findViewById(R.id.delimg);
            v.setTag(vh);
        }else{
            vh= (ViewHolder) v.getTag();
        }
        if (position==mMaxPosition-1){ //說明要顯示
            Glide.with(context).load(R.drawable.id_photo).dontAnimate()
                    .centerCrop().into(vh.img);
            vh.img.setVisibility(View.VISIBLE);
            vh.demimg.setVisibility(View.GONE);
            if (position==6&&mMaxPosition==7){//設定最大6個。那麼達到最大，就隱藏。
//                vh.img.setImageResource(R.drawable.id_photo);
                vh.img.setVisibility(View.GONE);
            }
        }else{//設定圖片。
            vh.demimg.setVisibility(View.VISIBLE);
            Glide.with(context).load(list.get(position)).into(vh.img);//設定
        }
        //刪除
        vh.demimg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                list.remove(position);
                notifyDataSetChanged();
            }
        });
        return v;
    }

    public class ViewHolder{
        public ImageView img,demimg;
    }

//這裡引用了一個很好用的相簿框架

 //相簿
    compile 'com.linchaolong.android:imagepicker:1.2'
//載入
    compile 'com.github.bumptech.glide:glide:3.8.0'

public class MainActivity extends AppCompatActivity {
    private GridView gridView;
    private GvAdapter adapter;
    private List<String> list;
    ImagePicker imagePicker ;
    String path;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        gridView = (GridView) findViewById(R.id.grid_view);
        initView();
    }
    private void initView() {
        imagePicker = new ImagePicker();
        // 設定標題
        imagePicker.setTitle("設定頭像");
        // 設定是否裁剪圖片
        imagePicker.setCropImage(true);
        list = new ArrayList<>();
        adapter = new GvAdapter(this, list);
        gridView.setAdapter(adapter);
        gridView.setOnItemClickListener(new AdapterView
                .OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View
                    view, int position, long id) {
                //判斷是否是最後一個。
                if (position==parent.getChildCount()-1){
                    if (position==6){//不能點選了
                    }else{
                        opnePhoto();
                    }
                }else{//可以加點預覽功能。

                }
            }
        });
    }
    public void opnePhoto() {
        // 啟動圖片選擇器
        imagePicker.startChooser(this, new ImagePicker.Callback() {
            // 選擇圖片回撥
            @Override
            public void onPickImage(Uri imageUri) {
            }
            // 裁剪圖片回撥
            @Override
            public void onCropImage(Uri imageUri) {
                if (list.size()>=6){
                    Toast.makeText(MainActivity.this,"最多選擇六張圖片",Toast.LENGTH_LONG).show();
                }else{
                    list.add(String.valueOf(imageUri));
                }
                adapter.notifyDataSetChanged();
//                path= String.valueOf(imageUri);
            }

            // 自定義裁剪配置
            @Override
            public void cropConfig(CropImage.ActivityBuilder
                                           builder) {
                builder
                        // 是否啟動多點觸控
                        .setMultiTouchEnabled(false)
                        // 設定網格顯示模式
                        .setGuidelines(CropImageView.Guidelines.OFF)
                        // 圓形/矩形
                        .setCropShape(CropImageView.CropShape
                                .RECTANGLE)
                        // 調整裁剪後的圖片最終大小
                        .setRequestedSize(960, 540)
                        // 寬高比
                        .setAspectRatio(16, 9);
            }
            // 使用者拒絕授權回撥
            @Override
            public void onPermissionDenied(int requestCode,
                                           String[] permissions,
                                           int[] grantResults) {
            }
        });
    }
    @Override
    protected void onActivityResult(int requestCode, int
            resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        imagePicker.onActivityResult(MainActivity.this,requestCode, resultCode, data);

    }
}

這是xml介面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="theagent.com.photo.MainActivity">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"/>
    <GridView
        android:id="@+id/grid_view"
        android:numColumns="4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </GridView>
</LinearLayout>