android 實現GridView多選效果

jopen 11年前發布 | 14K 次閱讀 Android開發 移動開發 Android

在使用 GridView的時候，有時需要多選上面顯示的類容，比如批量刪除上面顯示的圖片，批量上傳圖片等。這個時候我們可以使用層疊圖來實現，效果如下，點擊圖片后，上面會顯示出一個打鉤的圖片，如圖：再點擊選中圖片，勾消失。

20130527091337022.png

具體代碼如下：


main.xml

 <LinearLayoutxmlns:android="


xmlns:tools="http://schemas.android.com/tools"

android:background="#000000"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

tools:context=".MainActivity">




<GridView



   android:layout_width="fill_parent"

   android:layout_height="fill_parent"

   android:id="@+id/grid"

   android:verticalSpacing="3dp"

   android:horizontalSpacing="3dp"

   android:numColumns="3"

   ></GridView>




</LinearLayout></pre>


item.xml




 <?xmlversion="1.0"encoding="utf-8"?>


<LinearLayoutxmlns:android="


android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">






<ImageView



android:scaleType="fitXY"

android:padding="3dp"

android:layout_height="70dp"

android:layout_width="70dp"

android:id="@+id/image_item"

/>




</LinearLayout></pre>






mainActivity.java
package com.imageview;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.AdapterView.OnItemClickListener;


public class MainActivity extends Activity {
private Adpter adpter;
private GridView gridView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
int [] image={R.drawable.dog1,R.drawable.m2,R.drawable.m3,R.drawable.m4,R.drawable.m5,R.drawable.dog2};
adpter=new Adpter(image, this);
gridView=(GridView) findViewById(R.id.grid);
gridView.setAdapter(adpter);
gridView.setOnItemClickListener(new OnItemClickListener() {

            @Override 
            public void onItemClick(AdapterView<?> arg0, View arg1,

                            int position, long arg3) {

            adpter.chiceState(position);
            }

    });

}
}</pre> 
Adpter.java


package com.imageview;


import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;


public class Adpter extends BaseAdapter {
private int[] image;
private boolean isChice[];
private Context context;


public Adpter(int[] im, Context context) {
this.image = im;
Log.i("hck", im.length+"lenght");
isChice=new boolean[im.length];
for (int i = 0; i < im.length; i++) {
isChice[i]=false;
}
this.context = context;
}


@Override
public int getCount() {
return image.length;
}


@Override
public Object getItem(int arg0) {
return image[arg0];
}


@Override
public long getItemId(int arg0) {
return arg0;
}


@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
View view = arg1;
GetView getView=null;
if (view == null) {
view = LayoutInflater.from(context).inflate(R.layout.item, null);
getView = new GetView();
getView.imageView=(ImageView) view.findViewById(R.id.image_item);
view.setTag(getView);
} else {
getView = (GetView) view.getTag();
}
getView.imageView.setImageDrawable(getView(arg0));


return view;
}


static class GetView {
ImageView imageView;
}



//主要就是下面的代碼了



private LayerDrawable getView(int post) {


Bitmap bitmap = ((BitmapDrawable)context.getResources().getDrawable(image[post])).getBitmap();

Bitmap bitmap2=null;
LayerDrawable la=null;
if (isChice[post]== true){

bitmap2 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.editable_mode_checked_tag);
}
if (bitmap2!=null) {
Drawable[] array = new Drawable[2];
array[0] = new BitmapDrawable(bitmap);
array[1] = new BitmapDrawable(bitmap2);
la= new LayerDrawable(array);
la.setLayerInset(0, 0, 0, 0, 0);   //第幾張圖離各邊的間距
la.setLayerInset(1, 0, 65, 65, 0);

}
else {
Drawable[] array = new Drawable[1];
array[0] = new BitmapDrawable(bitmap);
la= new LayerDrawable(array);
la.setLayerInset(0, 0, 0, 0, 0);
}
return la; // 返回疊加后的圖
}
public void chiceState(int post)
{
isChice[post]=isChice[post]==true?false:true;
this.notifyDataSetChanged();
}
}</pre></span></span>
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