如何在Android中玩GIF

Question

您好stackoverflow我正在尝试开发一个Android应用程序来玩我自己的GIF,这里是代码片段

MainActivity.java

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
}
}

AnimationView.java

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

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.util.AttributeSet;
import android.view.View;

public class AnimationView extends View {
private Movie mMovie;
private long mMovieStart;
private static final boolean DECODE_STREAM = true;

private int mDrawLeftPos;
private int mHeight, mWidth;

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 AnimationView(Context context, AttributeSet attrs) {
    super(context, attrs);
    setFocusable(true);
    java.io.InputStream is;
    is = context.getResources().openRawResource(R.drawable.scanning);
    if (DECODE_STREAM) {
        mMovie = Movie.decodeStream(is);
    } else {
        byte[] array = streamToBytes(is);
        mMovie = Movie.decodeByteArray(array, 0, array.length);
    }
}

@Override
protected void onMeasure( int widthMeasureSpec, int heightMeasureSpec )
{   
    int p_top = this.getPaddingTop(), p_bottom = this.getPaddingBottom();

    mWidth = mMovie.width();
    mHeight = mMovie.height();
    // Calculate new desired height
    final int desiredHSpec = MeasureSpec.makeMeasureSpec( mHeight + p_top + p_bottom , MeasureSpec.EXACTLY );

    setMeasuredDimension( widthMeasureSpec, desiredHSpec );
    super.onMeasure( widthMeasureSpec, desiredHSpec );

    // Update the draw left position
    mDrawLeftPos = Math.max( ( this.getWidth() - mWidth ) / 2, 0) ;
}

@Override
public void onDraw(Canvas 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 = 3000;
        }
        int relTime = (int) ((now - mMovieStart) % dur);
        // Log.d("", "real time :: " +relTime);
        mMovie.setTime(relTime);
        mMovie.draw(canvas, mDrawLeftPos, this.getPaddingTop());
        invalidate();
    }
}
}

main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
android:orientation="vertical" >

<com.example.androidgifwork.AnimationView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerInParent="true" />
</LinearLayout>

的Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidgifwork"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="19" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name="com.example.androidgifwork.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

当我运行上面的代码片段时GIF根本没有运行,但当我删除android:targetSdkVersion="19" GIF运行时,请帮我解决这个问题.

谢谢

Answer 1

2017更新的答案

要在Android中使用GIF,请使用Glide库加载任何图像或GIF.

Glide.with(context)
.load(YOUR_GIF)
.into(YOUR_IMAGE_VIEW);

使用Glide从服务器加载普通图像,图像,甚至加载GIF.另外看看Picasso android图片加载库,它类似于Glide但截至目前(2017年4月16日)Picasso不支持在Android中加载GIF.

################################################## ####################

老求解

对于所有想要在您的应用中玩GIF的人,请在 PlayGifView.java 下面找到代码

 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Movie;
 import android.os.Build;
 import android.util.AttributeSet;
 import android.view.View;

 public class PlayGifView extends View{

     private static final int DEFAULT_MOVIEW_DURATION = 1000;

     private int mMovieResourceId;
     private Movie mMovie;

     private long mMovieStart = 0;
     private int mCurrentAnimationTime = 0;

     @SuppressLint("NewApi")
     public PlayGifView(Context context, AttributeSet attrs) {
         super(context, attrs);

        /**
         * Starting from HONEYCOMB have to turn off HardWare acceleration to draw
         * Movie on Canvas.
         */
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }
    }

     public void setImageResource(int mvId){
         this.mMovieResourceId = mvId;
    mMovie = Movie.decodeStream(getResources().openRawResource(mMovieResourceId));
    requestLayout();
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    if(mMovie != null){
        setMeasuredDimension(mMovie.width(), mMovie.height());
    }else{
        setMeasuredDimension(getSuggestedMinimumWidth(), getSuggestedMinimumHeight());
    }
}

@Override
protected void onDraw(Canvas canvas) {
    if (mMovie != null){
        updateAnimtionTime();
        drawGif(canvas);
        invalidate();
    }else{
        drawGif(canvas);
    }
}

private void updateAnimtionTime() {
    long now = android.os.SystemClock.uptimeMillis();

    if (mMovieStart == 0) {
        mMovieStart = now;
    }
    int dur = mMovie.duration();
    if (dur == 0) {
        dur = DEFAULT_MOVIEW_DURATION;
    }
    mCurrentAnimationTime = (int) ((now - mMovieStart) % dur);
}

private void drawGif(Canvas canvas) {
    mMovie.setTime(mCurrentAnimationTime);
    mMovie.draw(canvas, 0, 0);
    canvas.restore();
}

}

在您的活动类中,使用以下代码来播放GIF

PlayGifView pGif = (PlayGifView) findViewById(R.id.viewGif);
pGif.setImageResource(<Your GIF file name Eg: R.drawable.infinity_gif>);

XML布局

<yourPacckageName.PlayGifView
            android:id="@+id/viewGif"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center" />

Answer 2

使用Glide将项目raw文件夹或外部URL中的任何gif加载到ImageView, ImageButtons或类似[Glide targets][2]

Glide.with(getActivity()).load(R.raw.alarm).asGif().into(btnAlert);