Question

我有一个自定义视图来显示gif动画图像。当我将自定义视图放入线性布局时，我的自定义视图下的其他元素不会显示。这是我的观点：

public class GIFView extends View{        
private Movie movie;  
private InputStream is;  
private long moviestart;  
private long duration;

public GIFView(Context context) {  
    super(context);
    is=getResources().openRawResource(R.drawable.anim_cerca);  
    movie=Movie.decodeStream(is);
    duration = movie.duration();
}  

public GIFView(Context context,AttributeSet set){
    super(context,set);
    is=getResources().openRawResource(R.drawable.anim_cerca);  
    movie=Movie.decodeStream(is);
    duration = movie.duration();
}

public GIFView(Context context,AttributeSet set,int def){
    super(context,set,def);
    is=getResources().openRawResource(R.drawable.anim_cerca);  
    movie=Movie.decodeStream(is);
    duration = movie.duration();
}

@Override  
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    long now=android.os.SystemClock.uptimeMillis();
    Paint p = new Paint();
    p.setAntiAlias(true);
    if (moviestart == 0) 
        moviestart = now;

    int relTime = (int)((now - moviestart) % duration);

    movie.setTime(relTime);
    movie.draw(canvas,0,0);


    this.invalidate();
    }                         
}

这是我的布局xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent" android:background="@drawable/sfondo">
<LinearLayout android:id="@+id/linearLayout2"
    android:layout_height="wrap_content" android:layout_width="match_parent"
    android:orientation="vertical">
    <LinearLayout android:id="@+id/linearLayout1"
        android:layout_height="fill_parent" android:weightSum="1"
        android:layout_width="fill_parent" android:orientation="horizontal">
        <ImageView android:layout_height="73dp" android:id="@+id/imageView1"
            android:layout_weight="0.25" android:src="@drawable/trovachiavi"
            android:layout_width="256dip"></ImageView>
        <ImageButton android:id="@+id/infoButton"
            android:background="@null" android:layout_height="47dp"
            android:layout_marginLeft="10dip" android:layout_weight="0.25"
            android:layout_marginTop="15dip" android:src="@drawable/info_mini"
            android:layout_width="47dp"></ImageButton>
    </LinearLayout>
</LinearLayout>
<LinearLayout android:id="@+id/layoutGIF"
    android:layout_height="wrap_content" android:layout_width="wrap_content"
    android:orientation="vertical"
    android:layout_gravity="center">
</LinearLayout>
<ImageButton android:id="@+id/avvia_cerca"
    android:layout_height="wrap_content" android:layout_width="wrap_content"
    android:layout_marginTop="10dp" android:layout_gravity="center|bottom"
    android:background="@null"></ImageButton>
</LinearLayout>

在活动中，我以这种方式将自定义视图添加到具有id layoutGIF的布局：

LinearLayout lg = (LinearLayout)findViewById(R.id.layoutGIF);
lg.setGravity(Gravity.CENTER);
gif = new GIFView(this);
lg.addView(gif, new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT));

我该怎么办？我需要这个元素！

Answer 1

最好的方法是使用动画..不要认为gif是解决方案..不是每个Android设备都支持！

自定义视图在xml中看不到上面的元素

1 个答案: