I get a NullPointerException when I try to invoke openFileOutput() on
the instrumentation context for an InstrumentationTestCase. Is this
by design? I am able to use the target context.
public class ImageUtilTest extends InstrumentationTestCase
{
/** the instrumentation context */
private Context ctx;
/** context of application under test */
private Context targetCtx;
public void setUp() throws IOException
{
ctx = getInstrumentation().getContext();
targetCtx = getInstrumentation().getTargetContext();
// copy the example image file from the assets folder to the data
folder
InputStream in = ctx.getAssets().open("fixture/" +
LIGHTS_BUTTON_FILENAME);
// Trying to invoke openFileOutput() on ctx (the instrumentation
context)
// throws a NullPointerException. Use the target context instead.
FileOutputStream out =
targetCtx.openFileOutput(LIGHTS_BUTTON_FILENAME,
Context.MODE_PRIVATE);
}
}
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