android中文本文件的视图类似于android中图像的视图

Question

我想制作一个应用程序，以网格模式显示文档、pdf、txt等文本文件，就像ImageView显示图像一样。在android中是否有这些文件的视图。代码如下所示，在此我可以查看网格中的图像，但不能查看文档文件。

 public class MainActivity extends Activity implements  OnItemClickListener{

public class ImageAdapter extends BaseAdapter {

 private Context mContext;
 ArrayList<String> itemList = new ArrayList<String>();

 public ImageAdapter(Context c) {
  mContext = c; 
 }

 void add(String path){
  itemList.add(path); 
 }

  @Override
   public int getCount() {
  return itemList.size();
 }

 @Override
 public Object getItem(int arg0) {
 // TODO Auto-generated method stub
 return null;
 }

 @Override
 public long getItemId(int position) {
 // TODO Auto-generated method stub
 return 0;
}

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  ImageView imageView;
     if (convertView == null) {  // if it's not recycled, initialize some attributes
         imageView = new ImageView(mContext);
         imageView.setLayoutParams(new GridView.LayoutParams(70, 70));
         imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
         imageView.setPadding(3, 3, 3, 3);
     } else {
         imageView = (ImageView) convertView;
     }

     Bitmap bm = decodeSampledBitmapFromUri(itemList.get(position), 100, 100);

     imageView.setImageBitmap(bm);
     return imageView;
 }

 public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) {

  Bitmap bm = null;
 // First decode with inJustDecodeBounds=true to check dimensions
 final BitmapFactory.Options options = new BitmapFactory.Options();
 options.inJustDecodeBounds = true;
 BitmapFactory.decodeFile(path, options);

 // Calculate inSampleSize
 options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

 // Decode bitmap with inSampleSize set
 options.inJustDecodeBounds = false;
 bm = BitmapFactory.decodeFile(path, options); 

 return bm;   
}

public int calculateInSampleSize(

 BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
 final int height = options.outHeight;
 final int width = options.outWidth;
 int inSampleSize = 1;

 if (height > reqHeight || width > reqWidth) {
  if (width > height) {
  inSampleSize = Math.round((float)height / (float)reqHeight);    
 } else {
  inSampleSize = Math.round((float)width / (float)reqWidth);    
 }   
 }

 return inSampleSize;    
 }

 }

 ImageAdapter myImageAdapter;

 @Override
 public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    GridView gridview = (GridView) findViewById(R.id.gridview);
    myImageAdapter = new ImageAdapter(this);
    gridview.setAdapter(myImageAdapter);
    gridview.setOnItemClickListener(this);
    String ExternalStorageDirectoryPath = Environment
      .getExternalStorageDirectory()
      .getAbsolutePath();

    String targetPath = ExternalStorageDirectoryPath + "/img/";

    Toast.makeText(getApplicationContext(), targetPath, Toast.LENGTH_LONG).show();
    File targetDirector = new File(targetPath);

    File[] files = targetDirector.listFiles();
    for (File file : files){
    myImageAdapter.add(file.getAbsolutePath());


     } 
    }

  @Override
  public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

 }

}

Answer 1

使用方式如下：

                      if(filetype.toString().equals(".pdf"))
                      {
                              //place your pdf image
                          imageview= (ImageView)findViewById(R.id.imageView);
                          Drawable res = getResources().getDrawable(imageResource);
                          imageView.setImageDrawable(res);
                      }

                      else if(filetype.toString().equals(".docs"))
                      {
                            //place your docs image
                          imageview= (ImageView)findViewById(R.id.imageView);
                          Drawable res = getResources().getDrawable(imageResource);
                          imageView.setImageDrawable(res); 
                      }

                      else if(filetype.toString().equals(".txt "))
                      {
                            //place your txt image
                          imageview= (ImageView)findViewById(R.id.imageView);
                          Drawable res = getResources().getDrawable(imageResource);
                          imageView.setImageDrawable(res);
                      }

如何在android中动态设置drawable中的图像？。希望这对你有帮助