SketchActivity.java

package com.myc;

import imageUtil.ImageUtil;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.widget.ImageView;


public class SketchActivity extends Activity {
	private final int PROGRESS_WAIT_VISIBLE = 1;
	private final int PROGRESS_WAIT_GONE = 2;
	private final int IMAGEVIEW_INVALIDATE = 3;
	private ImageView mImageView;
	private Bitmap mBitmap;
	private Handler mHandler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			super.handleMessage(msg);
			switch (msg.what) {
				case PROGRESS_WAIT_VISIBLE:
					setProgressBarIndeterminateVisibility(true);
					break;
				case PROGRESS_WAIT_GONE:
					setProgressBarIndeterminateVisibility(false);
					break;
				case IMAGEVIEW_INVALIDATE:
					 mImageView.setImageBitmap(mBitmap);
					mImageView.invalidate();
					break;
				default:
					break;
			}
		}
	};
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.sketch);
        mImageView = (ImageView) findViewById(R.id.sketch_image);
        cancelSketch();
        doSketch();
    }
    
    @Override
	public boolean onCreateOptionsMenu(Menu menu) {
		super.onCreateOptionsMenu(menu);
		menu.add(1, 1, 1, "素描");
		menu.add(1, 2, 2, "取消");
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		super.onOptionsItemSelected(item);
		switch (item.getItemId()) {
			case 1:
				doSketch();
				break;
			case 2:
				cancelSketch();
				break;
			default:
				break;
		}
		return true;
	}
	
	private void cancelSketch() {
		Bitmap bmp = BitmapFactory.decodeStream(getResources().openRawResource(R.drawable.image));
		int width = bmp.getWidth();
		int height = bmp.getHeight();
		int[] pixel = new int[width * height];
		
		bmp.getPixels(pixel, 0, width, 0, 0, width, height);
		mBitmap = Bitmap.createBitmap(width, height, bmp.getConfig());
		mBitmap.setPixels(pixel, 0, width, 0, 0, width, height);
        mImageView.setImageBitmap(mBitmap);
        bmp.recycle();
	}
    
	private void doSketch() {
		new Thread(new Runnable() {
			public void run() {
				try {
					mHandler.sendEmptyMessage(PROGRESS_WAIT_VISIBLE);
					mBitmap = ImageUtil.sketch(mBitmap);
					mHandler.sendEmptyMessage(IMAGEVIEW_INVALIDATE);
				} catch (Exception e) {
					Log.e("sketch", e.getMessage());
				} finally {
					mHandler.sendEmptyMessage(PROGRESS_WAIT_GONE);
				}
			}
		}).start();
	}	  
}