在ImageView中播放动态GIF图像文件

Question

我正在制作一款Android应用程序，其中我想在ImageView中播放一个GIF文件。我尝试了很多方法，制作了一个自定义类，但都没有成功。

有人之前实现过这个吗？

- Cool Jatt

---

可能是重复的问题：Android - 显示动态gif。 - Sergey Glotov

请参考以下链接：https://dev59.com/eWox5IYBdhLWcg3whUgV - Aerrow

Answer 1

你可以在Android SDK示例中找到示例代码。 gif图像显示在扩展了View的活动中。

使用gif图像而不是ImageView的代码是：

import android.app.Activity;
import android.content.Context;
import android.graphics.*;
import android.graphics.drawable.*;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.*;

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

public class BitmapDecode extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new SampleView(this));
    }

    private static class SampleView extends View {
        private Bitmap mBitmap;
        private Bitmap mBitmap2;
        private Bitmap mBitmap3;
        private Bitmap mBitmap4;
        private Drawable mDrawable;

        private Movie mMovie;
        private long mMovieStart;

        private static byte[] streamToBytes(InputStream is) {
            ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
            byte[] buffer = new byte[1024];
            int len;
            try {
                while ((len = is.read(buffer)) >= 0) {
                    os.write(buffer, 0, len);
                }
            } catch (java.io.IOException e) {
            }
            return os.toByteArray();
        }

        public SampleView(Context context) {
            super(context);
            setFocusable(true);

            java.io.InputStream is;
            is = context.getResources().openRawResource(R.drawable.beach);

            BitmapFactory.Options opts = new BitmapFactory.Options();
            Bitmap bm;

            opts.inJustDecodeBounds = true;
            bm = BitmapFactory.decodeStream(is, null, opts);

            // now opts.outWidth and opts.outHeight are the dimension of the
            // bitmap, even though bm is null

            opts.inJustDecodeBounds = false;    // this will request the bm
            opts.inSampleSize = 4;             // scaled down by 4
            bm = BitmapFactory.decodeStream(is, null, opts);

            mBitmap = bm;

            // decode an image with transparency
            is = context.getResources().openRawResource(R.drawable.frog);
            mBitmap2 = BitmapFactory.decodeStream(is);

            // create a deep copy of it using getPixels() into different configs
            int w = mBitmap2.getWidth();
            int h = mBitmap2.getHeight();
            int[] pixels = new int[w*h];
            mBitmap2.getPixels(pixels, 0, w, 0, 0, w, h);
            mBitmap3 = Bitmap.createBitmap(pixels, 0, w, w, h,
                                           Bitmap.Config.ARGB_8888);
            mBitmap4 = Bitmap.createBitmap(pixels, 0, w, w, h,
                                           Bitmap.Config.ARGB_4444);

            mDrawable = context.getResources().getDrawable(R.drawable.button);
            mDrawable.setBounds(150, 20, 300, 100);

            is = context.getResources().openRawResource(R.drawable.animated_gif);
            if (true) {
                mMovie = Movie.decodeStream(is);
            } else {
                byte[] array = streamToBytes(is);
                mMovie = Movie.decodeByteArray(array, 0, array.length);
            }
        }

        @Override protected void onDraw(Canvas canvas) {
            canvas.drawColor(0xFFCCCCCC);            

            Paint p = new Paint();
            p.setAntiAlias(true);

            canvas.drawBitmap(mBitmap, 10, 10, null);
            canvas.drawBitmap(mBitmap2, 10, 170, null);
            canvas.drawBitmap(mBitmap3, 110, 170, null);
            canvas.drawBitmap(mBitmap4, 210, 170, null);

            mDrawable.draw(canvas);

            long now = android.os.SystemClock.uptimeMillis();
            if (mMovieStart == 0) {   // first time
                mMovieStart = now;
            }
            if (mMovie != null) {
                int dur = mMovie.duration();
                if (dur == 0) {
                    dur = 1000;
                }
                int relTime = (int)((now - mMovieStart) % dur);
                mMovie.setTime(relTime);
                mMovie.draw(canvas, getWidth() - mMovie.width(),
                            getHeight() - mMovie.height());
                invalidate();
            }
        }
    }
}

你也可以使用这些链接

http://weavora.com/blog/2012/02/07/android-how-to-use-animated-gif/

http://droid-blog.net/2011/10/14/tutorial-how-to-use-animated-gifs-in-android-part-1/

- Avi Kumar

Answer 2

你可以在Android上不使用任何第三方库来显示GIF。以下是我实现的方式。

使用WebView组件。

<WebView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/imageWebView" />

大多数示例都展示了如何从资源文件夹中打开文件，但是我将向您展示如何从SD卡/内存中打开文件。

    WebView webView = (WebView) findViewById(R.id.imageWebView);
    String  data    = "<body> <img src = \""+ filePath+"\"/></body>";
    // 'filePath' is the path of your .GIF file on SD card.
   webView.loadDataWithBaseURL("file:///android_asset/",data,"text/html","UTF-8",null);

- Prakash

Answer 3

原生的ImageView不支持动态图片。

您可以使用以下两个选项来显示动态gif文件：

1. 使用VideoView
2. 使用ImageView

但是将gif文件拆分成多个部分，然后应用动画即可。尝试使用此链接playing-gif-animation，您将获得所需的结果。

- AkashG