【android】Gif合成

最近脑子一抽看了一个视频，说是合成Gif，就想玩一玩。事实证明就是脑抽。

上图

结构

1、找开源的Gif分析的文件。

就是上面的结构里的 gif 包下面的四个类。os：根本就没有用到下面两个类。

这是我找的，传到csdn上了，http://download.csdn.net/detail/chandelierr/9862589

2、上代码

这是跟着动脑学院的一个视频敲的。存在几个问题

1. 播放的时候就自己保存了，所以仿佛保存按钮做不了什么。

2. 有一个方法GifHelper.getGif(),GitHelper代码里没有我自己加上了。

   /** * 解码GIF图片 * * @param is * @return */public static GifFrame[] getGif(InputStream is) {    GifHelper gifHelper = new GifHelper();    if (GifHelper.STATUS_OK == gifHelper.read(is)) {        return gifHelper.getFrames();    }    return null;}

3. 这代码那个老师没调出来，然后说了将近一个小时的广告，很尴尬。

package com.chandelier.gitmaker;public class MainActivity extends AppCompatActivity implements View.OnClickListener, TextWatcher {  //这里随便找了个路径    File dest = new File("/storage/emulated/0/Tencent/TIMfile_recv/","dest"+Math.random()+".gif");    private static final String TAG = "MainActivity";    private static final int SELECT_IMAGE = 1;    public static final int PLAY = 2;    public static final int MAKEGIFANDPLAY = 3;    String imagePath;    GifHelper.GifFrame[] frames;    GifHelper.GifFrame[] copyFrames;    private Button select;    private Button save;    private EditText input;    private ImageView gif_loc;    private playThread pT ;  //用于在主线程中播放    Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            switch (msg.what){                case PLAY:                    Bitmap bitmap = (Bitmap)msg.obj;                    gif_loc.setImageBitmap(bitmap);                    int time = msg.arg1;                    handler.postDelayed(pT,time);                    break;                case MAKEGIFANDPLAY:                    if (pT != null){                        handler.removeCallbacks(pT);                    }                    pT = new playThread(copyFrames);                    pT.start();                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        select = (Button)findViewById(R.id.select);        save = (Button)findViewById(R.id.save);        input = (EditText)findViewById(R.id.input);        gif_loc = (ImageView)findViewById(R.id.gif_loc);        select.setOnClickListener(this);        save.setOnClickListener(this);        input.addTextChangedListener(this);    }  //复制、绘画和保存gif    private void createGif(){        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();        AnimatedGifEncoder animatedGifEncoder = new AnimatedGifEncoder();        animatedGifEncoder.start(outputStream);        animatedGifEncoder.setRepeat(0);        animatedGifEncoder.setDelay(0);        for (GifHelper.GifFrame frame:frames){            Bitmap bitmap = frame.image;            Bitmap copybitmap = bitmap.copy(Bitmap.Config.RGB_565,true);            Canvas canvas = new Canvas(copybitmap);            Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);            paint.setTextSize(20);            paint.setStyle(Paint.Style.FILL);            paint.setTypeface(Typeface.DEFAULT_BOLD);            Rect rect = new Rect();            String content = TextUtils.isEmpty(input.getText().toString())?"动次大次":input.getText().toString();            paint.getTextBounds(content,0,content.length(),rect);            canvas.drawText(content,copybitmap.getWidth()/2-rect.width()/2,copybitmap.getHeight()*0.2f,paint);            animatedGifEncoder.addFrame(copybitmap);            animatedGifEncoder.setDelay(frame.delay);        }        animatedGifEncoder.finish();        try {            FileOutputStream fos = new FileOutputStream(dest);            outputStream.writeTo(fos);            outputStream.flush();            fos.flush();            outputStream.close();            fos.close();            copyFrames = GifHelper.getGif(new FileInputStream(dest));        } catch (IOException e) {            e.printStackTrace();        }        runOnUiThread(new Runnable() {            @Override            public void run() {                Toast.makeText(MainActivity.this,"Gif已经生成。保存路径：\n" + dest.getAbsolutePath(),Toast.LENGTH_LONG).show();            }        });    }    @Override    public void onClick(View v) {        if (v.getId() == select.getId()){            Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);            startActivityForResult(intent,SELECT_IMAGE);        }else if (v.getId() == save.getId()){            new Thread(){                @Override                public void run() {                    createGif();                }            }.start();        }    }  //将 gif 加载进来    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if (requestCode == SELECT_IMAGE && resultCode == Activity.RESULT_OK && data != null){            Uri selectedImage = data.getData();            String[] filePathColumns = {MediaStore.Images.Media.DATA};            Cursor c = getContentResolver().query(selectedImage, filePathColumns, null, null, null);            c.moveToFirst();            int columnIndex = c.getColumnIndex(filePathColumns[0]);            imagePath = c.getString(columnIndex);            showImage(imagePath);            try {                frames = GifHelper.getGif(new FileInputStream(imagePath));            } catch (FileNotFoundException e) {                e.printStackTrace();            }            c.close();        }    }    private void showImage(String imagePath){        Bitmap bm = BitmapFactory.decodeFile(imagePath);        gif_loc.setImageBitmap(bm);    }    @Override    public void beforeTextChanged(CharSequence s, int start, int count, int after) {    }    @Override    public void onTextChanged(CharSequence s, int start, int before, int count) {    }    @Override    public void afterTextChanged(Editable s) {        new Thread(){            @Override            public void run() {                createGif();                handler.sendEmptyMessage(MAKEGIFANDPLAY);            }        }.start();    }    class playThread extends Thread{        GifHelper.GifFrame[] frames;        int frameLength = 0;        int i = 0;        public playThread(GifHelper.GifFrame[] frames) {            this.frames = frames;            frameLength = frames.length;        }        @Override        public void run() {            if (frames == null || frames.length == 0)                return;            if (!frames[i].image.isRecycled()){                Bitmap copy = frames[i].image.copy(Bitmap.Config.RGB_565,true);                Message msg = new Message();                msg.obj = copy;                msg.what = PLAY;                msg.arg1 = frames[i++].delay;                handler.sendMessage(msg);            }            i%=frameLength;        }    }}