TextActivity.java

package com.roboo.like.google;

import java.io.IOException;
import java.io.InputStream;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.animation.LinearInterpolator;
import android.widget.ImageView;
import android.widget.ScrollView;
import android.widget.TextView;

import com.nineoldandroids.animation.Animator;
import com.nineoldandroids.animation.ObjectAnimator;
import com.roboo.like.google.utils.GifDecoder;

/** 文字界面 */
public class TextActivity extends BaseLayoutActivity
{
	private static final String TAG = "Polish";
	final Handler mHandler = new Handler();
	private ScrollView mScroll;
	private TextView mText;
	private View mContent;
	private ImageView mImage;
	private boolean mIsPlayingGif = false;
	private GifDecoder mGifDecoder;
	private Bitmap mTmpBitmap;
	private Runnable mUpdateResults = new Runnable()
	{
		public void run()
		{
			if (mTmpBitmap != null && !mTmpBitmap.isRecycled())
			{
				mImage.setImageBitmap(mTmpBitmap);
			}
		}
	};

	/** 跳转到文字界面 */
	public static void actionText(Activity activity)
	{
		Intent intent = new Intent(activity, TextActivity.class);
		activity.startActivity(intent);
	}

	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_text);
		customActionBar();
		initView();
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item)
	{
		switch (item.getItemId())
		{
		case android.R.id.home:
			finish();
			break;
		}
		return super.onOptionsItemSelected(item);
	}

	@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
	public void initView()
	{
		mScroll = (ScrollView) findViewById(R.id.scroll);
		mText = (TextView) findViewById(R.id.text);
		mContent = findViewById(R.id.content);
		mImage = (ImageView) findViewById(R.id.image);
		final ViewTreeObserver vto = mText.getViewTreeObserver();
		if (vto != null)
		{
			vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener()
			{
				public void onGlobalLayout()
				{
					ViewTreeObserver vto = mText.getViewTreeObserver();
					if (vto != null)
					{
						// vto.removeOnGlobalLayoutListener(this);
					}
					mScroll.computeScroll();
					Animator anim = ObjectAnimator.ofInt(mScroll, "scrollY", 0, mContent.getBottom());
					anim.setDuration(30000);
					anim.setInterpolator(new LinearInterpolator());
					anim.start();
				}
			});
		}

	}

	@Override
	protected void onPause()
	{
		stopRendering();
		super.onPause();
	}

	@Override
	protected void onResume()
	{
		super.onResume();
		InputStream is = null;
		try
		{
			is = getAssets().open("animation.gif");
			playGif(is);
		}
		catch (IOException e)
		{
			Log.e(TAG, "Error loading animated GIF", e);
		}
		finally
		{
			if (is != null)
			{
				try
				{
					is.close();
				}
				catch (Exception e)
				{
					Log.w(TAG, "Error closing stream", e);
				}
			}
		}
	}

	private void playGif(InputStream stream)
	{
		mGifDecoder = new GifDecoder();
		int resultCode = mGifDecoder.read(stream);
		if (resultCode > 0)
		{
			Bitmap bitmap = BitmapFactory.decodeStream(stream);
			if(null == bitmap)
			{
				bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
			}
			mImage.setImageBitmap(bitmap);
		}
		else
		{
			mIsPlayingGif = true;
			new Thread(new Runnable()
			{
				public void run()
				{
					final int n = mGifDecoder.getFrameCount();
					final int ntimes = mGifDecoder.getLoopCount();
					int repetitionCounter = 0;
					do
					{
						for (int i = 0; i < n; i++)
						{
							mTmpBitmap = mGifDecoder.getFrame(i);
							int t = mGifDecoder.getDelay(i);
							mHandler.post(mUpdateResults);
							try
							{
								Thread.sleep(t);
							}
							catch (InterruptedException e)
							{
								e.printStackTrace();
							}
						}
						if (ntimes != 0)
						{
							repetitionCounter++;
						}
					}
					while (mIsPlayingGif && (repetitionCounter <= ntimes));
				}
			}).start();
		}
	}

	public void stopRendering()
	{
		mIsPlayingGif = false;
	}

	private void customActionBar()
	{
		mActionBar.setDisplayHomeAsUpEnabled(true);
		mActionBar.setTitle("文字");
		mActionBar.setLogo(R.drawable.ic_abs_mood_up);
	}

}