Android通过Movie展示Gif格式图片

本文实例为大家分享Android通过Movie展示Gif格式图片的相关代码，供大家参考，具体内容如下

public class CommonGifView extends View {
private Resources mResources;
private Movie mMovie;
private long startTime = 0;
private float widthRatio;
private float heightRatio;
public CommonGifView(Context context) {
this(context, null);
}
public CommonGifView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CommonGifView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mResources = context.getResources();
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.custom_gif_view);
int src_id = ta.getResourceId(R.styleable.custom_gif_view_gif_src, -1);
setGifViewBg(src_id);
ta.recycle();
}
/**
* 为View设置gif格式图片背景
* @description：
* @author ldm
* @date 2016-2-18 上午9:21:16
*/
private void setGifViewBg(int src_id) {
if (src_id == -1) { return; }
// 获取对应资源文件的输入流
InputStream is = mResources.openRawResource(src_id);
mMovie = Movie.decodeStream(is);// 解码输入流为Movie对象
requestLayout();
}
/*
* 这个方法供Activity中使用
*/
public void setGifStream(InputStream is) {
mMovie = Movie.decodeStream(is);
requestLayout();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
long now = SystemClock.uptimeMillis();
if (startTime == 0) { // 如果第一帧，记录起始时间
startTime = now;
}
if (mMovie != null) {// 如果返回值不等于null，就说明这是一个GIF图片
int duration = mMovie.duration();// 取出动画的时长
if (duration == 0) {
duration = 1000;
}
int currentTime = (int) ((now - startTime) % duration);// 算出需要显示第几帧
mMovie.setTime(currentTime);
// mMovie.draw(canvas, getWidth() - mMovie.width(), getHeight() - mMovie.height());
float scale = Math.min(widthRatio, heightRatio);
canvas.scale(scale, scale);
mMovie.draw(canvas, 0, 0);
invalidate();
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mMovie != null) {// 如果返回值不等于null，就说明这是一个GIF图片
int w = mMovie.width();//宽度
int h = mMovie.height();//高度
if (w <= 0) {
w = 1;
}
if (h <= 0) {
h = 1;
}
int left = getPaddingLeft();
int right = getPaddingRight();
int top = getPaddingTop();
int bottom = getPaddingBottom();
int widthSize, heightSize;
w += left + right;
h += top + bottom;
w = Math.max(w, getSuggestedMinimumWidth());
h = Math.max(h, getSuggestedMinimumHeight());
widthSize = resolveSizeAndState(w, widthMeasureSpec, 0);//根据你提供的大小和MeasureSpec，返回你想要的大小值
heightSize = resolveSizeAndState(h, heightMeasureSpec, 0);
widthRatio = (float) widthSize / w;
heightRatio = (float) heightSize / h;
setMeasuredDimension(widthSize, heightSize);
}
else {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
}

自定义属性res/values/attrs.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="custom_gif_view">
<attr name="gif_src" format="reference"></attr>
</declare-styleable>
</resources>

在Activity中使用：

public class MainActivity extends Activity {
private CommonGifView view;
private InputStream is;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
view = (CommonGifView) findViewById(R.id.gif_test);
try {
is = getAssets().open("test01.gif");
view.setGifStream(is);
}
catch (IOException e) {
e.printStackTrace();
}
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助。

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