安卓设置从gridview图像壁纸

像往常一样，我恐怕我在这个方面在我的头上。安卓设置从gridview图像壁纸

我已成功修改了一个教程，从对SD卡的文件夹得到一组图片在GridView控件显示

什么，我试图做的，是让用户选择一个设置为墙纸。

我的问题是，惠斯特我知道图像的文件夹位置必须收到它出现我无法解决如何得到它，然后将其设置为壁纸。

我已经包含了很多尝试中的一小部分，但它引发了所有有点错误，主要是NullPointers，因为我试图从galleryitem.xml文件访问ImageView。

public class MyWallpapers extends Activity { 


private boolean[] thumbnailsselection; 
private String[] arrPath; 
private ImageAdapter imageAdapter; 

ImageView Selected; 


ArrayList<String> f = new ArrayList<String>();// list of file paths 
File[] listFile; 


/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.wallpaper_view_activity); 


    getFromSdcard(); 
    GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid); 
    imageAdapter = new ImageAdapter(); 
    imagegrid.setAdapter(imageAdapter); 


    final ImageView Selected = (ImageView) findViewById(R.id.thumbImage); 
     Selected.setOnClickListener(new OnClickListener() { 

      public void onClick(View v) { 


       //need to get the position of the file and set it as wallpaper when the user clicks the image 

       Context context = this.getAbsolutePath(); 
       Bitmap mBitmap = BitmapFactory.decodeResource(getResources(), 
         mImageIds[pos]); 
       context.setWallpaper(context); 

      } 
     }); 
    } 



public void getFromSdcard() 
{ 
    File file= new File(android.os.Environment.getExternalStorageDirectory(),"Wallpaper"); 

     if (file.isDirectory()) 
     { 
      listFile = file.listFiles(); 


      for (int i = 0; i < listFile.length; i++) 
      { 

       f.add(listFile[i].getAbsolutePath()); 

      } 
     } 
} 

public class ImageAdapter extends BaseAdapter { 
    private LayoutInflater mInflater; 

    public ImageAdapter() { 
     mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 

    public int getCount() { 
     return f.size(); 
    } 

    public Object getItem(int position) { 
     return position; 
    } 

    public long getItemId(int position) { 
     return position; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
     ViewHolder holder; 
     if (convertView == null) { 
      holder = new ViewHolder(); 
      convertView = mInflater.inflate(
        R.layout.galleryitem, null); 
      holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage); 

      convertView.setTag(holder); 
     } 
     else { 
      holder = (ViewHolder) convertView.getTag(); 
     } 


     Bitmap myBitmap = BitmapFactory.decodeFile(f.get(position)); 
     holder.imageview.setImageBitmap(myBitmap); 
     return convertView; 
    } 
} 
class ViewHolder { 
    ImageView imageview; 


} 
    }

这是我在wallpaper_view_activity.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" > 

<GridView 
    android:id="@+id/PhoneImageGrid" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:layout_above="@+id/button1" 
    android:columnWidth="90dp" 
    android:gravity="center" 
    android:horizontalSpacing="10dp" 
    android:numColumns="auto_fit" 
    android:stretchMode="columnWidth" 
    android:verticalSpacing="10dp" />

最后的galleryitem.xml GridView控件

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" > 

<ImageView 
    android:id="@+id/thumbImage" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerInParent="true" />

任何帮助，这将是，一个s非常感谢

来源

2013-11-04 Master Zangetsu

ImageLocation = listFile[position].getAbsolutePath(); 

          BitmapFactory.Options options = new BitmapFactory.Options(); 
          options.inPreferredConfig = Bitmap.Config.ARGB_8888; 
          Bitmap bitmap = BitmapFactory.decodeFile(ImageLocation, options); 


          WallpaperManager myWallpaperManager 
          = WallpaperManager.getInstance(getApplicationContext()); 
          try { 
           myWallpaperManager.setBitmap(bitmap); 
           Toast.makeText(MyWallpapers.this, "Wallpaper Set", Toast.LENGTH_SHORT).show(); 
          } catch (IOException e) { 
           Toast.makeText(MyWallpapers.this, "Error", Toast.LENGTH_SHORT).show(); 
           e.printStackTrace(); 
          }

来源

2013-11-11 15:15:29

安卓设置从gridview图像壁纸

回答

相关问题