访问Drawable资源的宽和高

/*
 * 访问Drawable资源的宽和高
 * 程序通过Bitmap对象的BitmapFactoryResource()方法来取得Import和
 * Drawable的图片文件，在通过Bitmap的对象的getHeight()和getWidth()
 * 取得Drawable的宽高。
 */
import 略;

public class Ex07_01Activity extends Activity {
	private TextView mTextView;
	private ImageView mImageView;

	protected static final int CONTEXT_ITEM1 = Menu.FIRST;
	protected static final int CONTEXT_ITEM2 = Menu.FIRST + 1;
	protected static final int CONTEXT_ITEM3 = Menu.FIRST + 2;

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

		mTextView = (TextView) findViewById(R.id.myTextView1);
		mImageView = (ImageView) findViewById(R.id.myImageView1);

		mImageView
				.setImageDrawable(getResources().getDrawable(R.drawable.baby));
		mImageView
				.setOnCreateContextMenuListener(new ListView.OnCreateContextMenuListener() {

					@Override
					public void onCreateContextMenu(ContextMenu menu, View v,
							ContextMenuInfo menuInfo) {
						// TODO Auto-generated method stub
						menu.add(Menu.NONE, CONTEXT_ITEM1, 0,
								R.string.str_context1);
						menu.add(Menu.NONE, CONTEXT_ITEM2, 0,
								R.string.str_context2);
						menu.add(Menu.NONE, CONTEXT_ITEM3, 0,
								R.string.str_context3);
					}
				});
	}

	// 重写OnContextItemSeldcted来定义用户单击后的动作
	public boolean onContextItemSelected(MenuItem item) {
		Bitmap myBitmap = BitmapFactory.decodeResource(getResources(),
				R.drawable.baby);
		int intHeight = myBitmap.getHeight();
		int intWidth = myBitmap.getWidth();

		try {
			switch (item.getItemId()) {
			case CONTEXT_ITEM1:
				String strOpt = getResources().getString(R.string.str_width)
						+ "=" + Integer.toString(intWidth);
				mTextView.setText(strOpt);
				break;
			case CONTEXT_ITEM2:
				String strOpt2 = getResources().getString(R.string.str_height)
						+ "=" + Integer.toString(intHeight);
				mTextView.setText(strOpt2);
				break;
			case CONTEXT_ITEM3:
				String strOpt3 = getResources().getString(R.string.str_width)
						+ "=" + Integer.toString(intWidth) + "\n"
						+ getResources().getString(R.string.str_height) + "="
						+ Integer.toString(intHeight);
				mTextView.setText(strOpt3);
				break;
			default:
				break;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return super.onContextItemSelected(item);
	}
}

布局文件很简单，在这里我就不再详述了，下面我们来看看程序的运行结果：