IntentUtils.java

package com.tiger.quicknews.wedget.slideingactivity;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.os.Handler;
import android.os.Looper;
import android.view.View;

import com.tiger.quicknews.activity.BaseActivity;
import com.tiger.quicknews.utils.BMapUtil;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * Created by chenjishi on 14-3-19.
 */
public class IntentUtils {
    public static String KEY_PREVIEW_IMAGE = "preview_image";
    static ByteArrayOutputStream baos = null;
    static Bitmap bitmap = null;

    /**
     * start screen capture with no delay
     * 
     * @param context
     * @param intent
     */
    public static void startPreviewActivity(Context context, Intent intent, int requestCode) {
        startPreviewActivity(context, intent, 0, requestCode);
    }

    /**
     * start screen capture after "delay" milliseconds, so the previous
     * activity's state recover to normal state, such as button click, list item
     * click,wait them to normal state so we can make a good screen capture
     * 
     * @param context
     * @param intent
     * @param delay time in milliseconds
     */
    public static void startPreviewActivity(final Context context, final Intent intent, long delay,
            final int requestCode) {
        final Handler mainThread = new Handler(Looper.getMainLooper());
        final Runnable postAction = new Runnable() {
            @Override
            public void run() {
                if (requestCode == 0) {
                    context.startActivity(intent);
                } else {
                    ((BaseActivity) context).startActivityForResult(intent, requestCode);
                }
            }
        };

        /** process screen capture on background thread */
        Runnable action = new Runnable() {
            @Override
            public void run() {
                /**
                 * activity's root layout id, you can change the
                 * android.R.id.content to your root layout id
                 */
                final View contentView = ((Activity) context).findViewById(android.R.id.content);

                try {
                    bitmap = Bitmap.createBitmap(contentView.getWidth(),
                            contentView.getHeight(), Bitmap.Config.ARGB_4444);
                    // bitmap = BMapUtil.getBitmapFromViews(contentView);
                    contentView.draw(new Canvas(bitmap));

                    baos = new ByteArrayOutputStream();
                    bitmap.compress(Bitmap.CompressFormat.JPEG, 70, baos);
                    intent.putExtra(KEY_PREVIEW_IMAGE, baos.toByteArray());

                }
                catch (Exception e) {
                    e.printStackTrace();
                }
                finally {
                    try {
                        /** no need to close, actually do nothing */
                        if (null != baos)
                            baos.close();
                        if (null != bitmap && !bitmap.isRecycled()) {
                            // bitmap.recycle();
                            bitmap = null;
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                mainThread.post(postAction);
            }
        };

        if (delay > 0) {
            ScheduledExecutorService worker = Executors.newSingleThreadScheduledExecutor();
            worker.schedule(action, delay, TimeUnit.MILLISECONDS);
        } else {
            try {
                action.run();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}