android不显示gif

Question

I'm new in android development, so I have the following issue. I'm trying to show gif green.gif (res/drawable-xxhdpi/) via this code: GIFView class:

package ru.rkarasev.miptrain;

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

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

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

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        long now = android.os.SystemClock.uptimeMillis();

        if (moviestart == 0)
            moviestart = now;

        int relTime = (int) ((now - moviestart) % movie.duration());
        movie.setTime(relTime);
        movie.draw(canvas, 100, 100);
        this.invalidate();
    }
}

XML file part:

<TableRow>
     <TextView 
        android:id="@+id/final_1"
        android:width="200dp"
        android:textSize="25sp"/>
      <ru.rkarasev.miptrain.GIFView
        android:layout_marginLeft="30dp" 
        android:layout_gravity="center"
        android:layout_width="wrap_content" 
        android:layout_height="50dp"
        android:id="@+id/greenarrow">
        </ru.rkarasev.miptrain.GIFView>

     <TextView 
        android:id="@+id/time_1"
        android:text=""
        android:textSize="30sp"/>
</TableRow>

Activity code:

GIFView gifview = (GIFView) findViewById(R.id.greenarrow);

But the space where this view should be is empty, it doesn't show anything! Could you tell me what's the problem?

UPD: When I open activity_main.xml file, it doesn't show how my layout will look but give me this error:

java.lang.NullPointerException
    at ru.rkarasev.miptrain.GIFView.onDraw(GIFView.java:34)
    at android.view.View.draw(View.java:13707)
    at android.view.View.draw(View.java:13591)
    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
    at android.view.View.draw(View.java:13589)
    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
    at android.view.View.draw(View.java:13589)
    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
    at android.view.View.draw(View.java:13710)
    at android.view.View.draw(View.java:13591)
    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
    at android.view.View.draw(View.java:13589)
    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
    at android.view.View.draw(View.java:13710)
    at android.view.View.draw(View.java:13591)
    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
    at android.view.View.draw(View.java:13710)

34th string in GIFView is:

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

It seems like there was no movie initialized, but why?

If I also add

System.out.println(movie.duration());

in the beginning of onDraw method, it gives me 2100ms, which is correct value. It eludes me at all.

Answer 1

It seems like your Movie object is null, and after tracing the source code of Movie Class it fails silently (by catching the thrown IOException) and returns a null object.

just add a null check in your code and try to decode the gif file in another way. take a look here :

Failed to decode GIF

or you could try to move your GIF to the assets folder as suggested here : SO Answer