Android系統如何顯示空白的GridView與按鈕

Question

我想顯示空白動態網格這樣

我試圖填充電網這樣的，但是爲了這個，我需要繪製int數組發送到baseadapter.I知道它要做到這一點

不正確的方式請考慮以下情形：

1）用戶將獲得這種屏幕與「+」按鈕，將圖片添加到電網和空白格「 - 」按鈕，如果圖像存在於網格

上

2）只要用戶填入GridView的倒數第二個空白網格，即可動態增加網格。

考慮這個問題太Alternate Question

Answer 1

我已經創造了這一問題的虛方法（要添加修改GridView的動態）：

創建活動Main3Activity

public class Main3Activity extends AppCompatActivity implements ViewClickCallBack { 
    private RecyclerView recyclerView; 
    private GridAdapter gridAdapter; 
    private List<Model> models = new ArrayList<>(); 
    private final int SIZE_NEXT_ITEM = 5; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main3); 
     recyclerView = (RecyclerView) findViewById(R.id.grid_recycle); 
     gridAdapter = new GridAdapter(this); 
     getNextModel(); 
     gridAdapter.setModels(models); 
     RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(this, 3); 
     recyclerView.setLayoutManager(mLayoutManager); 
     recyclerView.setAdapter(gridAdapter); 
    } 

    @Override 
    public void viewClicked(int position) { 
     models.get(position - 1).setUploaded(true);// Set the upload flag as true for the clicked item 
     int gridItemCount = gridAdapter.getItemCount();// Get the total count of items in gridview 
     if ((gridItemCount - position) == 1) { // check if the clicked item is second last, if yes then difference would be 1 

      getNextModel(); 
      gridAdapter.setModels(models); 

     } else { 
      Toast.makeText(this, "Popup Image picker", Toast.LENGTH_SHORT).show(); 
     } 
     gridAdapter.notifyDataSetChanged(); 
    } 

    /** 
    * Function to get the set (or next set) of objects that 
    * we want to show in GRID view. 
    * 
    * These objects will be added to a list. 
    * This list will act as data source for adapter 
    **/ 
    private void getNextModel() { 
     for (int i = 0; i < SIZE_NEXT_ITEM; i++) { 
      Model model = new Model(); 
      model.setUploaded(false); 
      models.add(model); 
     } 

    } 


} 

XML作爲activity_main3

<?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:layout_width="match_parent" 
    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="work.sof.ghost.myapplication.Main3Activity"> 
    <android.support.v7.widget.RecyclerView 
     android:id="@+id/grid_recycle" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"/> 

</RelativeLayout> 

的適配器說GridAdapter

public class GridAdapter extends RecyclerView.Adapter<GridAdapter.GridViewHolder> { 
private ViewClickCallBack viewClickCallBack; 


private List<Model> models; 

public GridAdapter(ViewClickCallBack viewClickCallBack) { 
    this.viewClickCallBack = viewClickCallBack; 
} 

    class GridViewHolder extends RecyclerView.ViewHolder { 
     public TextView textView; 


     public GridViewHolder(View itemView) { 
      super(itemView); 
      textView = (TextView) itemView.findViewById(R.id.text_some); 
      textView.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        if (viewClickCallBack != null) { 
         Log.e("Element Index", "" + getAdapterPosition()); 
         /** 
         * Increment the position by 1, as getAdapterPosition will 
         * return the index (count starts from 0) of the element. 
         * Hence, to simplify, we will increment the index by one, 
         * so that when we calculate the second last element, we will 
         * check the difference for 1. 
         * */ 
         viewClickCallBack.viewClicked(getAdapterPosition() + 1); 
        } 
       } 
      }); 
     } 
    } 

    @Override 
    public GridViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     View itemView = LayoutInflater.from(parent.getContext()) 
       .inflate(R.layout.grid_view, parent, false); 

     return new GridViewHolder(itemView); 
    } 

    @Override 
    public void onBindViewHolder(GridViewHolder holder, int position) { 
     Model model = getModel(position); 
     if (model.isUploaded()) { 
      holder.textView.setText("-"); 
     } else { 
      holder.textView.setText("+"); 
     } 

    } 

    @Override 
    public int getItemCount() { 
     if (models != null) { 
      return models.size(); 
     } 
     return 0; 
    } 

    private Model getModel(int position) { 
     if (models != null) { 
      return models.get(position); 
     } 
     return null; 
    } 

    public void setModels(List<Model> models) { 
     this.models = models; 
    } 
} 

的模型類模型

public class Model { 
    private String imagePath; 
    private boolean isUploaded; 

    public String getImagePath() { 
     return imagePath; 
    } 

    public void setImagePath(String imagePath) { 
     this.imagePath = imagePath; 
    } 

    public boolean isUploaded() { 
     return isUploaded; 
    } 

    public void setUploaded(boolean uploaded) { 
     isUploaded = uploaded; 
    } 
} 

一種用於網格視圖佈局（我知道如圖問題:(其不相同）

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginBottom="5dp" 
    android:layout_marginRight="5dp" 
    android:background="@drawable/rect_drawable" 
    android:orientation="vertical"> 
    <ImageView 
     android:src="@drawable/ic_launcher" 
     android:id="@+id/image_holder" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" /> 

    <TextView 
     android:layout_gravity="right" 
     android:id="@+id/text_some" 
     android:layout_margin="10dp" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textSize="25sp" 
     android:text="+" /> 
</LinearLayout> 

drawabl Ë文件rect_drawable

<?xml version="1.0" encoding="utf-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> 

    <size 
     android:width="6dp" 
     android:height="6dp" /> 
    <solid android:color="@color/colorPrimary" /> 
</shape> 

關於復問題

「如何將多個圖像通過的AsyncTask儘快發送給服務器用戶按下保存或完成按鈕」：

使用

a）executeOnExecutor（java.util.concurrent.Executor，Object []） with THREAD_POOL_EXECUTOR。要發送1幅圖像每異步任務並行， 更多信息以https://developer.android.com/reference/android/os/AsyncTask.html

或

b）你可以按照https://stackoverflow.com/a/7130806/1920735

這將表明這樣的